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1987 Volume 4 Issue 5
2016, 4(5): 1-4
Abstract:
In this papar, the macrostructure of ZnO/γ-Al2O3 samples prepared by impregnation method has been investigated systematically. The pattern of change in crystallite size and in specific surface area of the formed zinc-deficient zinc aluminate (Znx Al2O3+x 0 < X < 1) has been studied. The original pore structure of γ-Al2O3 was found to be roughly retained in Znx Al2O3+x prepared by impregnation at the temperature used in preparation and operation of catalysts, so by using the impregnation method one can prepare Znx Al2O3+x of different pore structure to satisfy various demands, Which is hardly realized in coprecipitation method.
In this papar, the macrostructure of ZnO/γ-Al2O3 samples prepared by impregnation method has been investigated systematically. The pattern of change in crystallite size and in specific surface area of the formed zinc-deficient zinc aluminate (Znx Al2O3+x 0 < X < 1) has been studied. The original pore structure of γ-Al2O3 was found to be roughly retained in Znx Al2O3+x prepared by impregnation at the temperature used in preparation and operation of catalysts, so by using the impregnation method one can prepare Znx Al2O3+x of different pore structure to satisfy various demands, Which is hardly realized in coprecipitation method.
2016, 4(5): 5-10
Abstract:
The complexation of 2,3-dihydroxy-p-xylenediiminotetraacetic acid (DPTA) with Ca2+, Th4+ and diamagnetic rare earth ions La3+, Lu3+, Y3+ and Sc3+ has been investigated by 1H NMR and UV VIS absorption spectroscopy methods in this work. Based on the NMR results it is concluded that the reaction of DPTA with the diamagnetic RE ions is a slow exchange reaction, while that with Ca2+ is a fast one. The compositions of the complexes are as follows:Th4+ with DPTA forms 1:2 complex and the other ions Ca2+, La3+, Lu3+, Y3+ and Sc3+ mainly form 1:1 complexes. The compositions of the complexes are dependent on the pH of the solution. The chemical shift variatfons (△δ) on NMR spectra of dismagnetic RE complexes with DPTA have been compared with λmax variations (△λ) of UV absorption spectra. A similar order in change was found for both △δ and △λ:Sc3+ < Y3+≈Lu3+ << La3+.
The complexation of 2,3-dihydroxy-p-xylenediiminotetraacetic acid (DPTA) with Ca2+, Th4+ and diamagnetic rare earth ions La3+, Lu3+, Y3+ and Sc3+ has been investigated by 1H NMR and UV VIS absorption spectroscopy methods in this work. Based on the NMR results it is concluded that the reaction of DPTA with the diamagnetic RE ions is a slow exchange reaction, while that with Ca2+ is a fast one. The compositions of the complexes are as follows:Th4+ with DPTA forms 1:2 complex and the other ions Ca2+, La3+, Lu3+, Y3+ and Sc3+ mainly form 1:1 complexes. The compositions of the complexes are dependent on the pH of the solution. The chemical shift variatfons (△δ) on NMR spectra of dismagnetic RE complexes with DPTA have been compared with λmax variations (△λ) of UV absorption spectra. A similar order in change was found for both △δ and △λ:Sc3+ < Y3+≈Lu3+ << La3+.
2016, 4(5): 11-14
Abstract:
Poly(butadiene-b-dimethylsiloxane) diblock copolymers(PB-PDMS) with defined composition apd molecular weight and molecular weight distribution were synthesized by anionic sequential polymerization. Hydrogenation of polybutadiene block in PB-PDMS with ptoluene-sulfonyl hydrazide as hydrogenation agent yielded poly(ethylene-b-dimethylsiloxae) diblock copolymers(PE-PDMS).1H-NMR and IR spectroscopy showed that the hydrogenstion reaction was complete. The DSC results shdwed that both the crystallization behavior of PDMS block and the melting temperature of PE block were effected by the composition of PE-PDMS.
Poly(butadiene-b-dimethylsiloxane) diblock copolymers(PB-PDMS) with defined composition apd molecular weight and molecular weight distribution were synthesized by anionic sequential polymerization. Hydrogenation of polybutadiene block in PB-PDMS with ptoluene-sulfonyl hydrazide as hydrogenation agent yielded poly(ethylene-b-dimethylsiloxae) diblock copolymers(PE-PDMS).1H-NMR and IR spectroscopy showed that the hydrogenstion reaction was complete. The DSC results shdwed that both the crystallization behavior of PDMS block and the melting temperature of PE block were effected by the composition of PE-PDMS.
2016, 4(5): 15-19
Abstract:
The partition equilibrium of Fe(Ⅲ) between HCl and HEH[EHP] in n-C3H13 has been investigated. The proposed mechanism of the extraction is as follows:At low aqueous acidity, Fe(Ⅲ) is extracted by a cation-exchange reaction:Fe3++3(HL)2(0)???19870505-1???Fe(HL2)3(0)+3H+ and at high aqueous acidity by a solvatiott reaction similar to that when TBP is used as exfracfanf:Fe3++H++4Cl-+2.5(HL)2(0)???19870505-2???HFeCl4·5HL(0) Meanwhile, HCl is extracted simutaneously:H++Cl-+mH2O+1/2(HL)2(o)???19870505-3???HCl·(mH2O)·HL(o) The extractiou mechattism when the organic phase is saturated by Fe(1) at low aqueous acidity is likely as folIows:Fe3++Cl-+1.5(HL)2(o)???19870505-4???FeClL2·HL(o)+2H+ The equilibrium concentration constant (lgK1=2.435) and the thermodynamical functions (△H°, △Z° and △S°) are obtained. The proposed mechanisms were supported by 1R spectral measurements., The partition equilibrium of Fe(Ⅲ) between HCl and HEH[EHP] in n-C3H13 has been investigated. The proposed mechanism of the extraction is as follows:At low aqueous acidity, Fe(Ⅲ) is extracted by a cation-exchange reaction:Fe3++3(HL)2(0)
Fe(HL2)3(0)+3H+ and at high aqueous acidity by a solvatiott reaction similar to that when TBP is used as exfracfanf:Fe3++H++4Cl-+2.5(HL)2(0)
HFeCl4·5HL(0) Meanwhile, HCl is extracted simutaneously:H++Cl-+mH2O+1/2(HL)2(o)
HCl·(mH2O)·HL(o) The extractiou mechattism when the organic phase is saturated by Fe(1) at low aqueous acidity is likely as folIows:Fe3++Cl-+1.5(HL)2(o)
FeClL2·HL(o)+2H+ The equilibrium concentration constant (lgK1=2.435) and the thermodynamical functions (△H°, △Z° and △S°) are obtained. The proposed mechanisms were supported by 1R spectral measurements.
The partition equilibrium of Fe(Ⅲ) between HCl and HEH[EHP] in n-C3H13 has been investigated. The proposed mechanism of the extraction is as follows:At low aqueous acidity, Fe(Ⅲ) is extracted by a cation-exchange reaction:Fe3++3(HL)2(0)???19870505-1???Fe(HL2)3(0)+3H+ and at high aqueous acidity by a solvatiott reaction similar to that when TBP is used as exfracfanf:Fe3++H++4Cl-+2.5(HL)2(0)???19870505-2???HFeCl4·5HL(0) Meanwhile, HCl is extracted simutaneously:H++Cl-+mH2O+1/2(HL)2(o)???19870505-3???HCl·(mH2O)·HL(o) The extractiou mechattism when the organic phase is saturated by Fe(1) at low aqueous acidity is likely as folIows:Fe3++Cl-+1.5(HL)2(o)???19870505-4???FeClL2·HL(o)+2H+ The equilibrium concentration constant (lgK1=2.435) and the thermodynamical functions (△H°, △Z° and △S°) are obtained. The proposed mechanisms were supported by 1R spectral measurements., The partition equilibrium of Fe(Ⅲ) between HCl and HEH[EHP] in n-C3H13 has been investigated. The proposed mechanism of the extraction is as follows:At low aqueous acidity, Fe(Ⅲ) is extracted by a cation-exchange reaction:Fe3++3(HL)2(0)
Fe(HL2)3(0)+3H+ and at high aqueous acidity by a solvatiott reaction similar to that when TBP is used as exfracfanf:Fe3++H++4Cl-+2.5(HL)2(0)HFeCl4·5HL(0) Meanwhile, HCl is extracted simutaneously:H++Cl-+mH2O+1/2(HL)2(o)HCl·(mH2O)·HL(o) The extractiou mechattism when the organic phase is saturated by Fe(1) at low aqueous acidity is likely as folIows:Fe3++Cl-+1.5(HL)2(o)FeClL2·HL(o)+2H+ The equilibrium concentration constant (lgK1=2.435) and the thermodynamical functions (△H°, △Z° and △S°) are obtained. The proposed mechanisms were supported by 1R spectral measurements.
2016, 4(5): 20-24
Abstract:
The extraction of Re(Ⅶ)with quaternary ammonium salt N263 and trioctylamine(TOA) in n-octane from hydrochloride medium has been studied. The experimental results indicate that the extraction mechanism is an anion exchange:ReO4-+(n+1)ACl(0)???19870506???ReO4A·ACL(0)+Cl- where(0) represents the organic phase and K1,n the equilibrium constant,n=0,1 for N263 and n=0,1,2 for TOA., The extraction of Re(Ⅶ)with quaternary ammonium salt N263 and trioctylamine(TOA) in n-octane from hydrochloride medium has been studied. The experimental results indicate that the extraction mechanism is an anion exchange:ReO4-+(n+1)ACl(0)
ReO4A·ACL(0)+Cl- where(0) represents the organic phase and K1,n the equilibrium constant,n=0,1 for N263 and n=0,1,2 for TOA.
The extraction of Re(Ⅶ)with quaternary ammonium salt N263 and trioctylamine(TOA) in n-octane from hydrochloride medium has been studied. The experimental results indicate that the extraction mechanism is an anion exchange:ReO4-+(n+1)ACl(0)???19870506???ReO4A·ACL(0)+Cl- where(0) represents the organic phase and K1,n the equilibrium constant,n=0,1 for N263 and n=0,1,2 for TOA., The extraction of Re(Ⅶ)with quaternary ammonium salt N263 and trioctylamine(TOA) in n-octane from hydrochloride medium has been studied. The experimental results indicate that the extraction mechanism is an anion exchange:ReO4-+(n+1)ACl(0)
ReO4A·ACL(0)+Cl- where(0) represents the organic phase and K1,n the equilibrium constant,n=0,1 for N263 and n=0,1,2 for TOA.
2016, 4(5): 25-30
Abstract:
Multiple melting behaviour of nylon 610 has been studied by differential scanning calorimetry (DSC) and wide angle X-ray diffractometry (WAXD). Three melting peaks were observed on the DSC thermogram. According to both the partial inelting and the fractional melting viewpoints, the respective origin of the peaks was discussed. From the results obtained by programmed heating, isothermal crystallization and specific volume measurement, the equilibrium thermodynamic parameters T°m and △H°m of nylon 610 were estimated to be 517.6K and 211.7 J/g respectively.
Multiple melting behaviour of nylon 610 has been studied by differential scanning calorimetry (DSC) and wide angle X-ray diffractometry (WAXD). Three melting peaks were observed on the DSC thermogram. According to both the partial inelting and the fractional melting viewpoints, the respective origin of the peaks was discussed. From the results obtained by programmed heating, isothermal crystallization and specific volume measurement, the equilibrium thermodynamic parameters T°m and △H°m of nylon 610 were estimated to be 517.6K and 211.7 J/g respectively.
2016, 4(5): 31-34
Abstract:
Hydroxy-terminated butadiene-acrylonitryle copolymer (HTBN) was synthesized by using H2O2 as initiator. Four samples of HTBN with, fn=1.94, 2.32,2.64 and 3.02, respectively, were prepared by adding HOCH2CH2SH or 2-hydroxyethyl acrylate during polymerization. Isophorone diisocyanate (IPDI) was used as curing agent and N,N'-bis(hydroxypropyl) aniline (Isonol C-100)as chain extender.The results showed that the curing rate is dependent on fn, the higher the fn, the faster the rate. The crosslinking density of the cured rubber increascs with increasing fn, showing influence on the properties of the rubber. The tensile strength and hardness increase with increasing fn, with the elongation being decreased.HTBN elastomer with fn=1.93 is found to be a promising damping material due to the constant tanδ over a wide temperature range. Two transition temperatures were observed for all HTBN rubbers studied. Increase off fn is of benefit to the oil- and heat resistance of the cured rubber.
Hydroxy-terminated butadiene-acrylonitryle copolymer (HTBN) was synthesized by using H2O2 as initiator. Four samples of HTBN with, fn=1.94, 2.32,2.64 and 3.02, respectively, were prepared by adding HOCH2CH2SH or 2-hydroxyethyl acrylate during polymerization. Isophorone diisocyanate (IPDI) was used as curing agent and N,N'-bis(hydroxypropyl) aniline (Isonol C-100)as chain extender.The results showed that the curing rate is dependent on fn, the higher the fn, the faster the rate. The crosslinking density of the cured rubber increascs with increasing fn, showing influence on the properties of the rubber. The tensile strength and hardness increase with increasing fn, with the elongation being decreased.HTBN elastomer with fn=1.93 is found to be a promising damping material due to the constant tanδ over a wide temperature range. Two transition temperatures were observed for all HTBN rubbers studied. Increase off fn is of benefit to the oil- and heat resistance of the cured rubber.
2016, 4(5): 35-39
Abstract:
Ethylene oxide-styrene-ethylene oxide triblock polymers (PEO-PSt-PEO)were synthesized via sequential anionic polymerization by using sodium naphthalene as initiator, and the purified PEO-PSt-PEO triblock polymers and their parent polystyrenes were characterized by viscometry, GPC, 1H-NMR, dn/dc, and solubility measurements. It was found that the intrinsic viscosity and molecular weight of polystyrene inversely increased with the decrease of[M]/[I] ratio in the case of high concentration of initiator, indicating the existence of self-inhibiting action of inifiator. The refractive index increments of PEO-PSt-PEO triblock polymers showed good linear relations with their compositions. Therefore, dn/dc measurements can be used as a reliable method for the composition determination of the block polymers studied. Peak molecular weights of the block polymers in size exclusion chromatograms in THF were very close to that of the corresponding parent polystyrene. PEO-PSt-PEO with lower polystyrene content exhibited poorer solubility in THF.
Ethylene oxide-styrene-ethylene oxide triblock polymers (PEO-PSt-PEO)were synthesized via sequential anionic polymerization by using sodium naphthalene as initiator, and the purified PEO-PSt-PEO triblock polymers and their parent polystyrenes were characterized by viscometry, GPC, 1H-NMR, dn/dc, and solubility measurements. It was found that the intrinsic viscosity and molecular weight of polystyrene inversely increased with the decrease of[M]/[I] ratio in the case of high concentration of initiator, indicating the existence of self-inhibiting action of inifiator. The refractive index increments of PEO-PSt-PEO triblock polymers showed good linear relations with their compositions. Therefore, dn/dc measurements can be used as a reliable method for the composition determination of the block polymers studied. Peak molecular weights of the block polymers in size exclusion chromatograms in THF were very close to that of the corresponding parent polystyrene. PEO-PSt-PEO with lower polystyrene content exhibited poorer solubility in THF.
2016, 4(5): 40-44
Abstract:
Synthesis and characterization of VTP/PS copolymer networks were presented. The effect of the unattached macromolecule chains on glass transition temperature Tg and dynamic mechanical properties in terms of storage modulus E', loss modulus E" and loss tangent tanδ of the copolymer networks were studied. The viscoelastic parameters were calculated. The results indicated that the unattached macromolecule chains can evidently plasticize the copolymer network,and there by decrease its Tg and increase the free fractional volume and tanδ of the copolymer.
Synthesis and characterization of VTP/PS copolymer networks were presented. The effect of the unattached macromolecule chains on glass transition temperature Tg and dynamic mechanical properties in terms of storage modulus E', loss modulus E" and loss tangent tanδ of the copolymer networks were studied. The viscoelastic parameters were calculated. The results indicated that the unattached macromolecule chains can evidently plasticize the copolymer network,and there by decrease its Tg and increase the free fractional volume and tanδ of the copolymer.
2016, 4(5): 45-48
Abstract:
Using WAXD method, the crystalline behaviours of poly (butadiene-co-isoprene) (Ln-PBI) at low temperature were studied. When the weight ratio of butadiene/isoprene is <80/20, the Ln-PBI becomes noncrystalline even at very low temoerature(-110℃). However, when weight ratio is >80/20, the crystallinity of Ln PBI increases with decrease of crystallization temoerature, but the lattice parameters changes insignificantly. The crystal of Ln-PBI is considered mainly contributed by Ln-PB sequences and still belongs to monoclinic system.
Using WAXD method, the crystalline behaviours of poly (butadiene-co-isoprene) (Ln-PBI) at low temperature were studied. When the weight ratio of butadiene/isoprene is <80/20, the Ln-PBI becomes noncrystalline even at very low temoerature(-110℃). However, when weight ratio is >80/20, the crystallinity of Ln PBI increases with decrease of crystallization temoerature, but the lattice parameters changes insignificantly. The crystal of Ln-PBI is considered mainly contributed by Ln-PB sequences and still belongs to monoclinic system.
2016, 4(5): 49-54
Abstract:
The beads of styrene, acrylonitrile(41%) and divinylbenzene (3.6%) copolymer were synthesized and combined with titanium tetrachloride in chloroform to form an n-d bonding complex containing 14.74% of chlorine which correspond to 1.03×10-3mol TiCl4/g complex beads. The complex can be used to catalyze many organic reactions in bigh yield, such as esterification, ketal formation, acetalization, etherification and the Friedel-Crafts alkylation. The complex is very stable, it can be reused at least six times and more active than polystyrene-titanium tetrachloride complex[6].
The beads of styrene, acrylonitrile(41%) and divinylbenzene (3.6%) copolymer were synthesized and combined with titanium tetrachloride in chloroform to form an n-d bonding complex containing 14.74% of chlorine which correspond to 1.03×10-3mol TiCl4/g complex beads. The complex can be used to catalyze many organic reactions in bigh yield, such as esterification, ketal formation, acetalization, etherification and the Friedel-Crafts alkylation. The complex is very stable, it can be reused at least six times and more active than polystyrene-titanium tetrachloride complex[6].
2016, 4(5): 55-58
Abstract:
A new method for the analysis of neodymium-iron alloy is described. The sample is dissolved in HCLO4. Neodymium and praseodymium are determined by the third order derivative spectrophotometry, iron by UV spectroscopy. The method is simple, rapid and accurate.
A new method for the analysis of neodymium-iron alloy is described. The sample is dissolved in HCLO4. Neodymium and praseodymium are determined by the third order derivative spectrophotometry, iron by UV spectroscopy. The method is simple, rapid and accurate.
2016, 4(5): 59-61
Abstract:
Some gas-sensitive elements were prepared by sintering the mixture of SnO2, ZnO and Fe2O3. Most of the elements reported here were found to have higher sensitivity to C4H10, shorter response time and small dissipation value.
Some gas-sensitive elements were prepared by sintering the mixture of SnO2, ZnO and Fe2O3. Most of the elements reported here were found to have higher sensitivity to C4H10, shorter response time and small dissipation value.
2016, 4(5): 62-64
Abstract:
A new geen-blue cyano diazo disperse dye has been synthesized by using formamide and acetic anhydride as cyanating agent. Some parameters on the synthesis are studied., A new geen-blue cyano diazo disperse dye has been synthesized by using formamide and acetic anhydride as cyanating agent. Some parameters on the synthesis are studied.
A new geen-blue cyano diazo disperse dye has been synthesized by using formamide and acetic anhydride as cyanating agent. Some parameters on the synthesis are studied., A new geen-blue cyano diazo disperse dye has been synthesized by using formamide and acetic anhydride as cyanating agent. Some parameters on the synthesis are studied.
2016, 4(5): 65-68
Abstract:
The adsorption isotherms of cholesterol from cyclohexane,ethyl alcohol and cyclohexane-ethyl alcohol mixed solvent, and of egg-lecithin from ethyl alcohol and ethyl alcohol-water mixed solvent onto hydrophilic and hydrophobic silica gels have been determined (at 25℃). The contact angles On quartz and methylated quartz (with or without pre-adsorbed layers from above-mentioned solutions) have been determined. The results were explained in terms of the orientation of the adsorbed molecules and the surface properties of the SiO2 and methylated SiO2
The adsorption isotherms of cholesterol from cyclohexane,ethyl alcohol and cyclohexane-ethyl alcohol mixed solvent, and of egg-lecithin from ethyl alcohol and ethyl alcohol-water mixed solvent onto hydrophilic and hydrophobic silica gels have been determined (at 25℃). The contact angles On quartz and methylated quartz (with or without pre-adsorbed layers from above-mentioned solutions) have been determined. The results were explained in terms of the orientation of the adsorbed molecules and the surface properties of the SiO2 and methylated SiO2
2016, 4(5): 69-71
Abstract:
Five complexes[Cu(FDSC)2]Cl2,[Cu(FDTSC)2]Cl2,[Cu(N-FDSC)]Cl2],[Zn(N-FDTSC)2] and[Ni(N-FDTSC)2] have been synthesized and characterized FDSCH=N-(2-furfural)-semicarbazone,FDTSCH=N-(2-furfural)-thiosemicarbazone, N-FDSCH=N-(5-nitro-2-furfural)-semicarbazone and N-FDTSCH=N-(5-nitro-2-furfural)-thiosemicar-bazone.It is found that N-FDSCH, N-FDTSCH,[Cu(N-FDSC)]Cl2] and[Zn(N-FDTSC)2] showed a significant bacteriostasis on Staphylococcus aureus, Bacillus subtilis and Escherichia Coli. The relationship between the bacteriostatic activity and the structure of the compounds is discussed in the paper.
Five complexes[Cu(FDSC)2]Cl2,[Cu(FDTSC)2]Cl2,[Cu(N-FDSC)]Cl2],[Zn(N-FDTSC)2] and[Ni(N-FDTSC)2] have been synthesized and characterized FDSCH=N-(2-furfural)-semicarbazone,FDTSCH=N-(2-furfural)-thiosemicarbazone, N-FDSCH=N-(5-nitro-2-furfural)-semicarbazone and N-FDTSCH=N-(5-nitro-2-furfural)-thiosemicar-bazone.It is found that N-FDSCH, N-FDTSCH,[Cu(N-FDSC)]Cl2] and[Zn(N-FDTSC)2] showed a significant bacteriostasis on Staphylococcus aureus, Bacillus subtilis and Escherichia Coli. The relationship between the bacteriostatic activity and the structure of the compounds is discussed in the paper.
2016, 4(5): 72-73
Abstract:
The cycloaddition of acrolein with vinyl ether is catalyzed by lanthanide chlorides at mild reaction conditions. This reaction has the advantage of using a small amount of catalyst and having a moderate reaction rate.
The cycloaddition of acrolein with vinyl ether is catalyzed by lanthanide chlorides at mild reaction conditions. This reaction has the advantage of using a small amount of catalyst and having a moderate reaction rate.
2016, 4(5): 74-77
Abstract:
DSC results of poly(butadiene-b-dimethylsiloxane) diblock copolymers(PB-PDMS) with defined composition and molecular weight and narrow molecular weight distribution, synthesized by anionic sequential polymerization, showed that Tg of both blocks did not change with molecular weight and composition of the block copolymers, indicating a phase separation of the blocks. The crystallization behavior of PDMS block, however, was found to be effected by the composition and molecular weight of the block copolymers. TEM graphs and DSC results showed a clear relationship between crystallization behavior of PDMS and the morphology of PB-PDMS.
DSC results of poly(butadiene-b-dimethylsiloxane) diblock copolymers(PB-PDMS) with defined composition and molecular weight and narrow molecular weight distribution, synthesized by anionic sequential polymerization, showed that Tg of both blocks did not change with molecular weight and composition of the block copolymers, indicating a phase separation of the blocks. The crystallization behavior of PDMS block, however, was found to be effected by the composition and molecular weight of the block copolymers. TEM graphs and DSC results showed a clear relationship between crystallization behavior of PDMS and the morphology of PB-PDMS.
2016, 4(5): 78-81
Abstract:
The extraction of Fe(Ⅲ) from nitrate solution with P538 in kerosene has been studied at 25℃. The proposed extraction mechanism is as follows:1. At higher loading 2Fe3+ +(5/j)(H2A)j(0)=FeA(HA)4(0)+6H+ 2. At lower Loading Fe3++(3/j)(H2A)j(0)=Fe(HA)3(0)+3H+ The apparent extraction equilibrium constants were calculated to be 1011.16 and 106.84,respectively. From the experimental results when the formular weight concentration of the extractant is less than 3·10-3mol·dm-3 the apparent polymerization degree is estimated about 1.5-1.7.
The extraction of Fe(Ⅲ) from nitrate solution with P538 in kerosene has been studied at 25℃. The proposed extraction mechanism is as follows:1. At higher loading 2Fe3+ +(5/j)(H2A)j(0)=FeA(HA)4(0)+6H+ 2. At lower Loading Fe3++(3/j)(H2A)j(0)=Fe(HA)3(0)+3H+ The apparent extraction equilibrium constants were calculated to be 1011.16 and 106.84,respectively. From the experimental results when the formular weight concentration of the extractant is less than 3·10-3mol·dm-3 the apparent polymerization degree is estimated about 1.5-1.7.
2016, 4(5): 82-85
Abstract:
A solution of Cp2NdCl-LiCl-THF was prepared successfully and conveniently. The solution can be used to synthesize bis(cyclopentadienyl) organolanthanoid derivatives. Cp2NdC3H5 was prepared from Cp2NdCl-LiCl-THF solution and C3H5Li(1:1)at -78℃.CpNd(C3H5)2·THF and Li[CpNd(C3H5)3]·2Dioxan were prepared from[Li(THF)2]2 (μ-Cl)4CpNd.THF and C3H5Li(1:2 and 1:3 respectively). The new compounds were characterized by elementalanalysis, GC, MS and IR. The spectra of all three compounds show a band characteristic of η3-allyl moieties.
A solution of Cp2NdCl-LiCl-THF was prepared successfully and conveniently. The solution can be used to synthesize bis(cyclopentadienyl) organolanthanoid derivatives. Cp2NdC3H5 was prepared from Cp2NdCl-LiCl-THF solution and C3H5Li(1:1)at -78℃.CpNd(C3H5)2·THF and Li[CpNd(C3H5)3]·2Dioxan were prepared from[Li(THF)2]2 (μ-Cl)4CpNd.THF and C3H5Li(1:2 and 1:3 respectively). The new compounds were characterized by elementalanalysis, GC, MS and IR. The spectra of all three compounds show a band characteristic of η3-allyl moieties.
2016, 4(5): 86-87
Abstract:
Samples were prepared from oxides in the atomic ratio of Ba:Y:Cu=1:1:1 by solid state reaction.The appearnce of the products ranges from dark to green and a few of them are not uniform in color.They are stable in air and disintegretes into powder when immersed in water. They show Meissner effect; R-T curves of them show zero-resistence temperature at 85.9-88.4K. X-ray diffraction pattern shows that it is a multiphase system and one of the main phase is orthogonal with cell constants of a=3.86, b=3.84, c=11.62Å. SEM photos show that there are two species in micromorphology With composition of Ba:Y:Cu=1:2:1 and 3:2:5 respectively, through EDS measurements.
Samples were prepared from oxides in the atomic ratio of Ba:Y:Cu=1:1:1 by solid state reaction.The appearnce of the products ranges from dark to green and a few of them are not uniform in color.They are stable in air and disintegretes into powder when immersed in water. They show Meissner effect; R-T curves of them show zero-resistence temperature at 85.9-88.4K. X-ray diffraction pattern shows that it is a multiphase system and one of the main phase is orthogonal with cell constants of a=3.86, b=3.84, c=11.62Å. SEM photos show that there are two species in micromorphology With composition of Ba:Y:Cu=1:2:1 and 3:2:5 respectively, through EDS measurements.
2016, 4(5): 88-90
Abstract:
At 60℃ and in the presence of benzoyl peroxide, fulvic acid has been grafted onto natural rubber through heterogeneous phase polymerization. Tbe grafted product is soluble in organic solvents in common with the original rubber. A new absorption band (1130 cm-1) appeared in the IR spectrum of the grafted polymer, indicating the presence of C-O-C bond as the grafting site. The Tg of the grafted polymer measured by DSC methed is -53℃.
At 60℃ and in the presence of benzoyl peroxide, fulvic acid has been grafted onto natural rubber through heterogeneous phase polymerization. Tbe grafted product is soluble in organic solvents in common with the original rubber. A new absorption band (1130 cm-1) appeared in the IR spectrum of the grafted polymer, indicating the presence of C-O-C bond as the grafting site. The Tg of the grafted polymer measured by DSC methed is -53℃.
2016, 4(5): 91-93
Abstract:
A new approach to synthesize Sumithion was developed, including three steps:nitrosation, oxidation and condensation. Under the conditions of nitrosation the m-cresol was nitrosated by HNO2 to p-nitroso-m-cresol and the remained p-cresol could be easily removed by washing with toluene and recovered. p-Nitroso-m-cresol was then oxidized by HNO3 to p-nitro-m-cresol, the sodium salt of which is more stable in high temperature drying than p-nitro-m-cresol itself. Sumithion was obtained in a high yield.
A new approach to synthesize Sumithion was developed, including three steps:nitrosation, oxidation and condensation. Under the conditions of nitrosation the m-cresol was nitrosated by HNO2 to p-nitroso-m-cresol and the remained p-cresol could be easily removed by washing with toluene and recovered. p-Nitroso-m-cresol was then oxidized by HNO3 to p-nitro-m-cresol, the sodium salt of which is more stable in high temperature drying than p-nitro-m-cresol itself. Sumithion was obtained in a high yield.
