Login In
2006 Volume 17 Issue 11
2006, 17(11): 1421-1422
Abstract:
Intermolecular addition-cyclization of 1, 3-dicarbonyl compounds with arylbromoallenes in K2CO3 mediated condition afforded 2, 3, 4-trisubstituted furans in good yield.
Intermolecular addition-cyclization of 1, 3-dicarbonyl compounds with arylbromoallenes in K2CO3 mediated condition afforded 2, 3, 4-trisubstituted furans in good yield.
2006, 17(11): 1423-1426
Abstract:
In order to resolve the increasing resistance phenomena of the Gram-negative bacteria against single chain quaternary ammonium salts (QAS), lysine with a pedant fluorinated bis-ammonium salts was synthesized and its antimicrobial properties were evaluated in this work.The novel fluorinated bis-ammonium salts shows similar activity with conventional single chain quaternary ammonium salts against Gram-positive bacteria but stronger activity against Gram-negative bacteria and yeast compared with the single chained counterpart.
In order to resolve the increasing resistance phenomena of the Gram-negative bacteria against single chain quaternary ammonium salts (QAS), lysine with a pedant fluorinated bis-ammonium salts was synthesized and its antimicrobial properties were evaluated in this work.The novel fluorinated bis-ammonium salts shows similar activity with conventional single chain quaternary ammonium salts against Gram-positive bacteria but stronger activity against Gram-negative bacteria and yeast compared with the single chained counterpart.
Synthesis and Fungicidal Activities of 2-Alkylthio-5-(3, 4, 5-tribenzyloxyphenyl)-1,3, 4-oxadiazoles
2006, 17(11): 1427-1430
Abstract:
Ten novel 2-alkylthio-5-(3, 4, 5-tribenzyloxyphenyl)-1, 3, 4-oxadiazole derivatives (5a-j) were synthesized from methyl 3, 4, 5-trihydroxybenzoate by etherification, hydrazidation, cyclization and thioetherification reactions. The structures of 5a-j were confirmed by 1HNMR, MS spectra and elemental analysis. The results indicated that most of the compounds 5 exhibited good fungicidal activities. The activity of 5h is higher than 90% against Fusarium oxysporum and Botrytis cinereapers in 50 mg/L.
Ten novel 2-alkylthio-5-(3, 4, 5-tribenzyloxyphenyl)-1, 3, 4-oxadiazole derivatives (5a-j) were synthesized from methyl 3, 4, 5-trihydroxybenzoate by etherification, hydrazidation, cyclization and thioetherification reactions. The structures of 5a-j were confirmed by 1HNMR, MS spectra and elemental analysis. The results indicated that most of the compounds 5 exhibited good fungicidal activities. The activity of 5h is higher than 90% against Fusarium oxysporum and Botrytis cinereapers in 50 mg/L.
2006, 17(11): 1431-1434
Abstract:
New quinolone derivatives of 7-[2-aminomethylaziridin-1-yl]quinolone-3-carboxylic acids were synthesized. The structures of these compounds were characterized by 1H NMR and HRESI-MS.
New quinolone derivatives of 7-[2-aminomethylaziridin-1-yl]quinolone-3-carboxylic acids were synthesized. The structures of these compounds were characterized by 1H NMR and HRESI-MS.
2006, 17(11): 1435-1438
Abstract:
A novel N-methyl, N-phenyl-[6-chloro-2-(4-chlorophenyl)-8-iodoimidazo[1, 2-a]-pyridine-3-yl]acetamide (compound Ⅴ) was synthesized, radiolabelled with 131I and evaluated in vitro. In vitro cell uptake studies showed that MDA-MB-231 cells yield four-fold higher specific uptake of [131I]-compound Ⅵ than MCF-7 cells, corresponding to the increased expression of PBR in MDA-MB-231 cells. Blocking studies significantly reduced the MDA-MB-231 cells uptake of[131I]-compound Ⅵ. It indicated that [131I]-compound Ⅵ might be a potential SPECTradioligand for imaging of PBR.
A novel N-methyl, N-phenyl-[6-chloro-2-(4-chlorophenyl)-8-iodoimidazo[1, 2-a]-pyridine-3-yl]acetamide (compound Ⅴ) was synthesized, radiolabelled with 131I and evaluated in vitro. In vitro cell uptake studies showed that MDA-MB-231 cells yield four-fold higher specific uptake of [131I]-compound Ⅵ than MCF-7 cells, corresponding to the increased expression of PBR in MDA-MB-231 cells. Blocking studies significantly reduced the MDA-MB-231 cells uptake of[131I]-compound Ⅵ. It indicated that [131I]-compound Ⅵ might be a potential SPECTradioligand for imaging of PBR.
2006, 17(11): 1439-1442
Abstract:
Ten gem-difluoromethylenated chrysin derivatives were prepared and their anticancer activities in vitro were evaluated by the standard MTT method. The results of biological test showed that some of gem-difiuoromethylenated chrysin derivatives had higher anticancer activity than chrysin.
Ten gem-difluoromethylenated chrysin derivatives were prepared and their anticancer activities in vitro were evaluated by the standard MTT method. The results of biological test showed that some of gem-difiuoromethylenated chrysin derivatives had higher anticancer activity than chrysin.
2006, 17(11): 1443-1446
Abstract:
In order to find new urea cytokinins, a series of novel fluorinated heteroaromatic ureas have been designed and synthesized. The crystal structure of 3g was further determined by single crystal X-ray diffraction to obtain the structural feature of this class of urea compounds. The preliminary bioassay showed that some title compounds have good cytokinin activity.
In order to find new urea cytokinins, a series of novel fluorinated heteroaromatic ureas have been designed and synthesized. The crystal structure of 3g was further determined by single crystal X-ray diffraction to obtain the structural feature of this class of urea compounds. The preliminary bioassay showed that some title compounds have good cytokinin activity.
2006, 17(11): 1447-1450
Abstract:
A new compound 1-ethyl-1'-(4-vinylbenzyl)-4, 4'-bipyridinium chloride and iodide has been synthesized. The cyclic voltammogram and impedance spectra indicated that a layer of viologen's electrochromic (EC) film could be deposited on conductive ITO glass working electrode.With polyelectrolyte as ionic conduction layer, solid EC devices based on this compound have been assembled and their thickness was about 2.35 mm. When different voltages were added, they showed blue or violet red color. After optimization, its response time was less than 50 ms, the number of redox circulation was over 107 and the color of coloration states could be kept for 3 days. This kind of EC device can meet the demand of electronic ink.
A new compound 1-ethyl-1'-(4-vinylbenzyl)-4, 4'-bipyridinium chloride and iodide has been synthesized. The cyclic voltammogram and impedance spectra indicated that a layer of viologen's electrochromic (EC) film could be deposited on conductive ITO glass working electrode.With polyelectrolyte as ionic conduction layer, solid EC devices based on this compound have been assembled and their thickness was about 2.35 mm. When different voltages were added, they showed blue or violet red color. After optimization, its response time was less than 50 ms, the number of redox circulation was over 107 and the color of coloration states could be kept for 3 days. This kind of EC device can meet the demand of electronic ink.
2006, 17(11): 1451-1453
Abstract:
An efficient solid-phase synthesis method for novel heterocyclic ketene aminals containing a hydroxyl group has been developed. The loading of the substrate on the resin through the hydroxyl group and the protection of the amine by the Schiff base were the key steps in the synthesis.
An efficient solid-phase synthesis method for novel heterocyclic ketene aminals containing a hydroxyl group has been developed. The loading of the substrate on the resin through the hydroxyl group and the protection of the amine by the Schiff base were the key steps in the synthesis.
17-Dehydroxyholothurin A, a New Sulfated Triterpene Glycoside from Sea Cucumber Holothuria impatiens
2006, 17(11): 1454-1456
Abstract:
A new sulfated triterpene glycoside named as 17-dehydroxyholothurin A 1 was isolated from the sea cucumber Holothuria impatiens. Its structure was elucidated on the basis of spectroscopic data (2D NMR and MS) and chemical evidence. Compound 1 showed cytotoxic activity against cancer cell lines MKN-28, MFC-7, KB, HL-60 and Hep G2 with IC50 values of 1.98, 4.53, 2.01, 4.69 and 2.80×10-6 mol/L, respectively.
A new sulfated triterpene glycoside named as 17-dehydroxyholothurin A 1 was isolated from the sea cucumber Holothuria impatiens. Its structure was elucidated on the basis of spectroscopic data (2D NMR and MS) and chemical evidence. Compound 1 showed cytotoxic activity against cancer cell lines MKN-28, MFC-7, KB, HL-60 and Hep G2 with IC50 values of 1.98, 4.53, 2.01, 4.69 and 2.80×10-6 mol/L, respectively.
2006, 17(11): 1457-1459
Abstract:
A new flavanone (2S)-5, 7, 2', 5'-tetrahydroxy-flavanone 1 together with a new flavanone glycoside (2S)-5, 7, 2', 5'-tetrahydroxy-flavanone 7-O-β-D-glucopyranoside 2, were isolated from the dry roots of Scutellaria baicalensis. Their structures were elucidated on the basis of spectroscopic data.
A new flavanone (2S)-5, 7, 2', 5'-tetrahydroxy-flavanone 1 together with a new flavanone glycoside (2S)-5, 7, 2', 5'-tetrahydroxy-flavanone 7-O-β-D-glucopyranoside 2, were isolated from the dry roots of Scutellaria baicalensis. Their structures were elucidated on the basis of spectroscopic data.
2006, 17(11): 1460-1462
Abstract:
A new triterpenoid saponin, named codonolaside (1) was isolated from the root of Codonopsis lanceolata. Its structure was determined by analysis of its spectral and chemical data.
A new triterpenoid saponin, named codonolaside (1) was isolated from the root of Codonopsis lanceolata. Its structure was determined by analysis of its spectral and chemical data.
2006, 17(11): 1463-1465
Abstract:
A new degraded sesquiterpene was isolated from the marine actinomycete Streptomyces sp. 0616208. Its structure was elucidated as (1α, 4aα, 5α, 7β, 8aβ)-5, 8a-dimethyl-decahydrona-phthalene-1, 4a, 7-triol on the basis of spectroscopic data.
A new degraded sesquiterpene was isolated from the marine actinomycete Streptomyces sp. 0616208. Its structure was elucidated as (1α, 4aα, 5α, 7β, 8aβ)-5, 8a-dimethyl-decahydrona-phthalene-1, 4a, 7-triol on the basis of spectroscopic data.
2006, 17(11): 1466-1468
Abstract:
A novel butanolide, named virginaebutanolide F (1), was isolated from the lyophilized culture broth of Streptomyces sp., along with a known compound virginaebutanolide C (2). Their structures including the stereochemistry were elucidated on the basis of extensive 1D and 2D NMR as well as HRESI-MS and CD spectroscopic analysis.
A novel butanolide, named virginaebutanolide F (1), was isolated from the lyophilized culture broth of Streptomyces sp., along with a known compound virginaebutanolide C (2). Their structures including the stereochemistry were elucidated on the basis of extensive 1D and 2D NMR as well as HRESI-MS and CD spectroscopic analysis.
2006, 17(11): 1469-1472
Abstract:
A novel lysozyme named β-1, 4-N, 6-O-diacetylmuramidase R2 was purified and characterized from Streptomyces griseus. The molecular weight of the enzyme was determined by MALDI-TOF-MS as 23.5 kDa. The N-terminal amino acid sequence was DTSGVQGIDVSHWQG. Chemical modification of β-1, 4-N, 6-O-diacetylmuramidase R2 indicated that sulfhydryl group and carbamidine of arginine residues are not essential for the activity of the enzyme, but lysine residues and imidazole of histidine residues are essential for the activity. The number of essential tryptophan and carboxyl groups was found that only one tryptophan residue and three carboxyl groups in the active site.
A novel lysozyme named β-1, 4-N, 6-O-diacetylmuramidase R2 was purified and characterized from Streptomyces griseus. The molecular weight of the enzyme was determined by MALDI-TOF-MS as 23.5 kDa. The N-terminal amino acid sequence was DTSGVQGIDVSHWQG. Chemical modification of β-1, 4-N, 6-O-diacetylmuramidase R2 indicated that sulfhydryl group and carbamidine of arginine residues are not essential for the activity of the enzyme, but lysine residues and imidazole of histidine residues are essential for the activity. The number of essential tryptophan and carboxyl groups was found that only one tryptophan residue and three carboxyl groups in the active site.
2006, 17(11): 1473-1476
Abstract:
Two new C19-diterpenoid alkaloids, davidisines A (1) and B (2) along with thirteen known alkaloids were isolated from the whole herb of Delphinium davidii Franch. Their structures were established by spectral methods, especially 2D NMR techniques.
Two new C19-diterpenoid alkaloids, davidisines A (1) and B (2) along with thirteen known alkaloids were isolated from the whole herb of Delphinium davidii Franch. Their structures were established by spectral methods, especially 2D NMR techniques.
2006, 17(11): 1477-1480
Abstract:
Three new cycloartane triterpene glycosides were isolated from the rhizomes of Actaea asiatica. Their structures were elucidated as 25-ethoxyl-cimigenol-3-O-β-D-xylopyranoside 1, 2'-O-acetyl soulieoside C 2, 2'-O-acetyl cimiracemoside M 3.
Three new cycloartane triterpene glycosides were isolated from the rhizomes of Actaea asiatica. Their structures were elucidated as 25-ethoxyl-cimigenol-3-O-β-D-xylopyranoside 1, 2'-O-acetyl soulieoside C 2, 2'-O-acetyl cimiracemoside M 3.
2006, 17(11): 1481-1484
Abstract:
A homemade array surface plasmon resonance (SPR)-based imaging biosensor was used to develop sensitive and fast immunoassays to determine sulfamethoxazole (SMOZ) and sulfamethazine (SMT) in buffer. Two conjugations of sulfonamide-bovine serum albumin (BSA)were separately immobilized on two different rows of the array chip with one row as reference.The immobilization was carried out in the instrument to monitor the quantity of the conjugations immobilized. The antibody mixed with the sulfonamide in the buffer was injected over the surface of the chip to get a relative response which was inversely proportional to the concentration of the sulfonamide in the PBS buffer. Two calibration curves were constructed and the limit of detection for sufamethoxazole in buffer was 3.5 ng/mL and for sulfamethazine 0.6 ng/mL. The stability and specificity of the antibody were also studied. The monoclonal antibody did not bind with BSA.
A homemade array surface plasmon resonance (SPR)-based imaging biosensor was used to develop sensitive and fast immunoassays to determine sulfamethoxazole (SMOZ) and sulfamethazine (SMT) in buffer. Two conjugations of sulfonamide-bovine serum albumin (BSA)were separately immobilized on two different rows of the array chip with one row as reference.The immobilization was carried out in the instrument to monitor the quantity of the conjugations immobilized. The antibody mixed with the sulfonamide in the buffer was injected over the surface of the chip to get a relative response which was inversely proportional to the concentration of the sulfonamide in the PBS buffer. Two calibration curves were constructed and the limit of detection for sufamethoxazole in buffer was 3.5 ng/mL and for sulfamethazine 0.6 ng/mL. The stability and specificity of the antibody were also studied. The monoclonal antibody did not bind with BSA.
2006, 17(11): 1485-1488
Abstract:
A porous monolithic sol-gel column with the solution of methacryloxypropyltrimethoxysilane in toluene with an acid catalyst was prepared in the presence and absence of sodium dodecyl sulfate. In situ polymerization was carried out by γ-ray irradiation within the capillary. The γ-radiation-initiated synthesis could generate radicals directly on the monomer avoiding use of any initiator. The chromatographic behavior of the capillary monolithic columns were studied in the modes of CEC, p-CEC and low pressure-driven separation, all the tests exhibited reversed-phase character. It provided a viable alternative to either thermally initiated or photo polymerization method for the preparation of monolithic columns.
A porous monolithic sol-gel column with the solution of methacryloxypropyltrimethoxysilane in toluene with an acid catalyst was prepared in the presence and absence of sodium dodecyl sulfate. In situ polymerization was carried out by γ-ray irradiation within the capillary. The γ-radiation-initiated synthesis could generate radicals directly on the monomer avoiding use of any initiator. The chromatographic behavior of the capillary monolithic columns were studied in the modes of CEC, p-CEC and low pressure-driven separation, all the tests exhibited reversed-phase character. It provided a viable alternative to either thermally initiated or photo polymerization method for the preparation of monolithic columns.
Metal Ions Extraction with Glucose Derivatives as Chelating Reagents in Supercritical Carbon Dioxide
2006, 17(11): 1489-1492
Abstract:
A series of glucose derivatives have been used as chelating reagents to extract metal ions in supercritical carbon dioxide. With perfluoro-1-octanesulfonic acid tetraethylammonium salt as additive, glucose derivatives were selective for Sr2+ and Pb2+ extraction in supercritical carbon dioxide.
A series of glucose derivatives have been used as chelating reagents to extract metal ions in supercritical carbon dioxide. With perfluoro-1-octanesulfonic acid tetraethylammonium salt as additive, glucose derivatives were selective for Sr2+ and Pb2+ extraction in supercritical carbon dioxide.
2006, 17(11): 1493-1494
Abstract:
Ionic liquids (ILs) as additive in phosphate buffer for detection of carbofuran by plant-lipases inhibition method is described. The higher inhibition efficiency and the shorter analysis time can be obtained by using N-butylpyridinium tetrafluoroborate ionic liquid-phosphate buffer mixtures instead of pure phosphate buffer.
Ionic liquids (ILs) as additive in phosphate buffer for detection of carbofuran by plant-lipases inhibition method is described. The higher inhibition efficiency and the shorter analysis time can be obtained by using N-butylpyridinium tetrafluoroborate ionic liquid-phosphate buffer mixtures instead of pure phosphate buffer.
2006, 17(11): 1495-1498
Abstract:
The interaction between chitooligosaccharide-5-fluorouracil (COS-5FU) and bovine serum albumin (BSA) was studied by fluorescence spectroscopy. It was found that an energy transfer between COS-5FU and BSA had been occurred. The binding constants were calculated, k298k=1.175×10-4L·mol-1.Based on the mechanism of energy transfer of dipole interaction between the donor and acceptor, the distance between BSA and COS-5FU was determined.
The interaction between chitooligosaccharide-5-fluorouracil (COS-5FU) and bovine serum albumin (BSA) was studied by fluorescence spectroscopy. It was found that an energy transfer between COS-5FU and BSA had been occurred. The binding constants were calculated, k298k=1.175×10-4L·mol-1.Based on the mechanism of energy transfer of dipole interaction between the donor and acceptor, the distance between BSA and COS-5FU was determined.
2006, 17(11): 1499-1502
Abstract:
Ru(bpy)32+ electrochemiluminescence (ECL) was applied to determine quercetin. It was found that ECL intensity of Ru(bpy)32+ could be enhanced in the presence of quercetin in basic solution, and the enhanced light emission intensity was proportional to the concentration of quercetin over the range of 1×10-6 mol/L to 2×10-4 mol/L.
Ru(bpy)32+ electrochemiluminescence (ECL) was applied to determine quercetin. It was found that ECL intensity of Ru(bpy)32+ could be enhanced in the presence of quercetin in basic solution, and the enhanced light emission intensity was proportional to the concentration of quercetin over the range of 1×10-6 mol/L to 2×10-4 mol/L.
2006, 17(11): 1503-1506
Abstract:
Monodisperse functional polymer microspheres with different particle size and with clean surface were prepared by batch soap-free emulsion polymerization of styrene, methyl methacrylate and acrylic acid in the presence of salts, and the influences of type and amount of electrolytes on polymerization process and particle morphology were investigated. Results showed that there was a critical concentration for different electrolyte to make polymerization process and the resultant emulsion stable, and the particle size increased with the increase of electrolyte concentration. The effect of metal ions was Ca2+ >> K+ > Na+ > Li+, and the effect of haloids was Br- > Cl- > F-.
Monodisperse functional polymer microspheres with different particle size and with clean surface were prepared by batch soap-free emulsion polymerization of styrene, methyl methacrylate and acrylic acid in the presence of salts, and the influences of type and amount of electrolytes on polymerization process and particle morphology were investigated. Results showed that there was a critical concentration for different electrolyte to make polymerization process and the resultant emulsion stable, and the particle size increased with the increase of electrolyte concentration. The effect of metal ions was Ca2+ >> K+ > Na+ > Li+, and the effect of haloids was Br- > Cl- > F-.
2006, 17(11): 1507-1510
Abstract:
The preliminary results for one-pot synthesis of dendronized aromatic polyamides with chloromethyl groups in the periphery by macromonomer approach were reported first time. The GPC analysis of the resulting dendronized polymers has shown typical weight average molecular weight (Mw) of 41554 and a polydispersity of 2.74.
The preliminary results for one-pot synthesis of dendronized aromatic polyamides with chloromethyl groups in the periphery by macromonomer approach were reported first time. The GPC analysis of the resulting dendronized polymers has shown typical weight average molecular weight (Mw) of 41554 and a polydispersity of 2.74.
2006, 17(11): 1511-1514
Abstract:
A novel diamine 4-[(4'-butoxyphenoxy)carbonyl]phenyl-3", 5"-diaminobenzoate (BCDA)was synthesized from 4-butoxyphenol, 4-hydroxybenzoic acid and 3, 5-dinitrobenzoic acid through four main intermediates, and a series of polyimides were also synthesized. All the intermediates and the final product were characterized by FTIR and 1H-NMR. The key step in synthesis route is selective hydrolyzation of two ester groups in 4-butoxyphenyl-4'-acetoxybenzoate, by adjusting the reaction temperature and the concentration of ammonia, shorteding the reaction time. The properties of the novel polyimides, such as the aggregation structures, glass transition temperature, solubility and the pretilt angles, were carried out.
A novel diamine 4-[(4'-butoxyphenoxy)carbonyl]phenyl-3", 5"-diaminobenzoate (BCDA)was synthesized from 4-butoxyphenol, 4-hydroxybenzoic acid and 3, 5-dinitrobenzoic acid through four main intermediates, and a series of polyimides were also synthesized. All the intermediates and the final product were characterized by FTIR and 1H-NMR. The key step in synthesis route is selective hydrolyzation of two ester groups in 4-butoxyphenyl-4'-acetoxybenzoate, by adjusting the reaction temperature and the concentration of ammonia, shorteding the reaction time. The properties of the novel polyimides, such as the aggregation structures, glass transition temperature, solubility and the pretilt angles, were carried out.
2006, 17(11): 1515-1518
Abstract:
The apparent shear viscosity (ηa) of a blend composed of 97 wt% high-density polyethylene (HDPE) and 3 wt% polyamide (PA-66) was measured by capillary rheometry at different shear rates, below, near and above the melting point of PA-66, i.e. 240℃, 260℃ and 280℃, respectively. At 260℃ and a high shear rate, ηa of the blend reduced abnormally; and at 260℃, was lower than that at 280℃. The images of etched surface of extrudate observed by the SEM showed different dispersed phase morphology, induced by flow at different temperatures. It is suggested that the formation of fibrillar morphology of dispersed phase is a key factor for the abnormal reduction of ηa for the HDPE/PA blend.
The apparent shear viscosity (ηa) of a blend composed of 97 wt% high-density polyethylene (HDPE) and 3 wt% polyamide (PA-66) was measured by capillary rheometry at different shear rates, below, near and above the melting point of PA-66, i.e. 240℃, 260℃ and 280℃, respectively. At 260℃ and a high shear rate, ηa of the blend reduced abnormally; and at 260℃, was lower than that at 280℃. The images of etched surface of extrudate observed by the SEM showed different dispersed phase morphology, induced by flow at different temperatures. It is suggested that the formation of fibrillar morphology of dispersed phase is a key factor for the abnormal reduction of ηa for the HDPE/PA blend.
2006, 17(11): 1519-1522
Abstract:
Bovine serum albumin (BSA), a naturally occurring biopolymer, was regarded as a polymeric material to graft to an acrylic acid (AA)-N-vinyl pyrrolidone (NVP) copolymer to form a biomacromolecular hybrid polymer. The hybrid polymer can be blended with polyethersulfone (PES) to increase the hydrophilicity of the PES membrane, which suggested that the hybrid polymer might have a wide application in the modification of biomaterials.
Bovine serum albumin (BSA), a naturally occurring biopolymer, was regarded as a polymeric material to graft to an acrylic acid (AA)-N-vinyl pyrrolidone (NVP) copolymer to form a biomacromolecular hybrid polymer. The hybrid polymer can be blended with polyethersulfone (PES) to increase the hydrophilicity of the PES membrane, which suggested that the hybrid polymer might have a wide application in the modification of biomaterials.
2006, 17(11): 1523-1526
Abstract:
The compositions of copolymers of diethyldiallylammonium chloride (DEDAAC) with acrylamide (AM), acrylic acid (AA) or sodium acrylic acid (NaAA) at low conversion were determined by elemental analysis, and the reactivity ratios of monomers in copolymerization were obtained by Kelen-Tudos method. The results showed that the reactivity ratios rDE and rAM are 0.31 and 5.27 for DEDAAC with AM, rDE and rAA are 0.28 and 5.15 for DEDAAC with AA, and rDE and rNaAA are 0.40 and 3.97 for DEDAAC with NaAA, respectively. The copolymerizations for DEDAAC with AM, AA or NaAA are non-ideal copolymerization and the products are random copolymers.
The compositions of copolymers of diethyldiallylammonium chloride (DEDAAC) with acrylamide (AM), acrylic acid (AA) or sodium acrylic acid (NaAA) at low conversion were determined by elemental analysis, and the reactivity ratios of monomers in copolymerization were obtained by Kelen-Tudos method. The results showed that the reactivity ratios rDE and rAM are 0.31 and 5.27 for DEDAAC with AM, rDE and rAA are 0.28 and 5.15 for DEDAAC with AA, and rDE and rNaAA are 0.40 and 3.97 for DEDAAC with NaAA, respectively. The copolymerizations for DEDAAC with AM, AA or NaAA are non-ideal copolymerization and the products are random copolymers.
2006, 17(11): 1527-1530
Abstract:
CS-CMC bipolar membrane was prepared and the cross-section photograph of CS-CMC BM was observed by SEM. FT-IR spectrum indicated that CS-CMC BM contained -N=CRH2+and -COO- functional groups. The charge density of -N=CRH2+ in CS membrane was about 14.13 mmol/g and the charge density of -COO- in CMC membrane was about 9.01 mmol/g. The electrochemistry properties of CS-CMC BM were also studied. CS-CMC BM not only can effectively stop FeO42- from diffusing into the cathode chamber, but also plays an important role in the supply of OH- consumed during the electro-generated FeO42- process.
CS-CMC bipolar membrane was prepared and the cross-section photograph of CS-CMC BM was observed by SEM. FT-IR spectrum indicated that CS-CMC BM contained -N=CRH2+and -COO- functional groups. The charge density of -N=CRH2+ in CS membrane was about 14.13 mmol/g and the charge density of -COO- in CMC membrane was about 9.01 mmol/g. The electrochemistry properties of CS-CMC BM were also studied. CS-CMC BM not only can effectively stop FeO42- from diffusing into the cathode chamber, but also plays an important role in the supply of OH- consumed during the electro-generated FeO42- process.
