N-异丙基丙烯酰胺-丙烯酰胺热敏凝胶的溶胀特性

Swelling Properties of Temperature Sensitive P(NIPAm-Am) Hydrogel

制备并表征了N 异丙基丙烯酰胺-丙烯酰胺热敏凝胶(NIPAm Am),研究了单体配比、引发剂、交联剂用量和温度对其溶胀特性的影响。结果表明:NIPAm Am热敏凝胶是由亲水和疏水基团组成的非晶高聚物。mAm/mNIPAm越大,凝胶的平衡溶胀率越大;增加交联剂的用量,凝胶的溶胀率减小,当引发剂的质量分数为0.008时溶胀率达最大值;温度的增加会使凝胶的溶胀率减小,在相转变温度时,溶胀率的变化最大。

This article deals with the swelling kinetics of temperature sensitive P(NIPAm-co-Am) hydrogel, coming to the conclusion that the hydrogel is non-crystal polymer, composed of hydrophilic and hydrophobic chains. Its swelling ratio (S_e) varys with the ratio of NIPAm/ Am, the dosages of crosslink agent or initiator and temperature. The increasing ratio of NIPAm/ Am makes S_eincreased, while the increasing dosages of crosslink agent results in S_e reduced. When the mass fraction of initiator is 8.0×10^(-4), S_e gets to maximum. With the enhancing temperature, S_e is declines quickly.