引用本文:
陈莉, 董晶, 孟庆杰. 阳离子型温敏水凝胶的溶胀性能及其对表面活性剂的吸附行为[J]. 应用化学,
2003, 20(4): 328-331.
Citation: CHEN Li, DONG Jing, MENG Qing-Jie. Swelling and Surfanctant Binding Behavior of Thermosensitive Cationic Hydrogels[J]. Chinese Journal of Applied Chemistry, 2003, 20(4): 328-331.
Citation: CHEN Li, DONG Jing, MENG Qing-Jie. Swelling and Surfanctant Binding Behavior of Thermosensitive Cationic Hydrogels[J]. Chinese Journal of Applied Chemistry, 2003, 20(4): 328-331.
阳离子型温敏水凝胶的溶胀性能及其对表面活性剂的吸附行为
摘要:
合成了N-异丙基丙烯酰胺(NIPAM)与氯化三甲基-3-丙烯酰胺丙基胺(DMAPAA-Q)的共聚凝胶,分别考察了阳离子单体DMAPAA-Q含量对凝胶的低临界溶解温度(LCST)、溶胀性、溶胀动力学、再溶胀动力学等性能的影响。结果发现,当x(DMAPAA-Q)<7.5%时,随着阳离子含量的增加,水凝胶的溶胀度增大,LCST升高;而当x(DMAPAA-Q)=37.5%时,水凝胶的LCST已经消失。退溶胀动力学的研究表明,水凝胶45℃时2min内体积收缩最快,5min后基本达到平衡;而再溶胀过程中2h内速度最快,5h内可达到溶胀平衡。与以往的聚电解质与表面活性剂形成1:1复合物有所不同,NIPAM与DMAPAA-Q的共聚物与表面活性剂间形成了2步吸附过程。
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关键词:
- N-异丙基丙烯酰胺(NIPAM)
- / 阳离子单体
- / 温敏凝胶
- / 表面活性剂
English
Swelling and Surfanctant Binding Behavior of Thermosensitive Cationic Hydrogels
Abstract:
Thermosensitive cationic hydrogels poly (NIPAM-co-DMAPAA-Q) were synthesized by radical copolymerization of N-isopropylacrylamide (NIPAM) with acryloylamino propyl trimethyl ammonium chloride (DMAPAA-Q),and the influences of amount of cationic monomer DMAPAA-Q on the swelling ratio,deswelling/reswelling kinetics have been studied.It is found that the swelling ratio and low critical solution temperature (LCST) of the copolymer hydrogels increased with increase in the content of cationic monomer when the mass fraction of DMAPAA-Q was ≤7.5%.The LCST disappeared when x>(DMAPAA-Q)=37.5%.The greatest reswelling rate occurred in period of first 2 h and the equillibrium state achieved in 5 h.The interaction of the copolymer with surfactants appeared to be a two-step adsorption process,rather than a formation of 1:1 complex between polyelectrolyte and surfactants.
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Key words:
- N-isopropylacrylamide
- / cationic monomer
- / thermosensitive hydrogel
- / surfactant
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