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Citation: GENG Tongmou, ZHANG Xia. Synthesis and Swelling Properties of Hydrophobically Modified pH Sensitive Hydrogels P(HEMA-NaAA-DiAC₁₆)[J]. Chinese Journal of Applied Chemistry, ;2014, 31(2): 140-146. doi: 10.3724/SP.J.1095.2014.30187 shu

Synthesis and Swelling Properties of Hydrophobically Modified pH Sensitive Hydrogels P(HEMA-NaAA-DiAC₁₆)

GENG Tongmou ^, ,
ZHANG Xia

1.
Anhui Key Laboratory of Functional Coordination Compounds, School of Chemistry and Chemical Engineering, Anqing Normal College, Anqing 246011, China

Corresponding author: GENG Tongmou,
Received Date: 16 April 2013
Available Online: 4 June 2013

Hydrophobical monomer N,N-diallyl-N-hexadecylamine was synthesized by the reaction between diallyamine and 1-bromohexadecane.The monomer was characterized using FTIR,¹H NMR and element analysis.A series of hydrophobically modified pH sensitive intelligent hydrogels poly(2-hydroxylethyl methacrylate/sodium acrylate/N,N-diallyl-N-hexadecylamine)[P(HEMA-NaAA-DiAC₁₆)]was successfully prepared by radically micellar copolymerization with 2-hydroxylethyl methacrylate(HEMA),sodium acrylate(NaAA),and N,N-diallyl-N-hexadecylamine(DiAC₁₆) as comonomers,sodium dodecyl sulfate(SDS) as the surfactant,N,N'-methylenebisacrylamide(BIS) as crosslinking agent,ammonium persulfate[(NH₄)₂S₂O₈]-N,N,N',N'-tetramethylethylenediamine(TMEDA) as initiating agent.The effects of hydrophobical monomer,NaAA,BIS contents and pH,ionic strength on swelling behaviors of P(HEMA-NaAA-DiAC₁₆) had been studied.The results indicate that the equilibrium swelling ratio SR₀ of the hydrogels decreases with increasing the amounts of DiAC 16 or BIS,with decreasing of NaAA,which are 78.9~163.91 in distilled water.The n values are 0.5~1.0 and increase with the increase of DiAC 16,NaAA or BIS.The diffusions of water into P(HEMA-NaAA-DiAC₁₆) gels are found to be a non-Fickian mode and exothermic process.The ΔH_m are -2.09~-3.64 kJ/mol,the modulus of ΔH_m and affinity between the polymers and water increase with the increase of NaAA and BIS,and the decrease of DiAC₁₆.The equilibrium swelling ratio decreases with the increase of ionic strength.
- hydrophobically modified,
- intelligent hydrogels,
- swelling ratio,
- pH sensitivity,
- swelling dynamics
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Synthesis and Swelling Properties of Hydrophobically Modified pH Sensitive Hydrogels P(HEMA-NaAA-DiAC16)

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通讯作者: 陈斌, bchen63@163.com

Synthesis and Swelling Properties of Hydrophobically Modified pH Sensitive Hydrogels P(HEMA-NaAA-DiAC₁₆)