PVA-g-PNIPA温度敏感凝胶纤维

PVA-g-PNIPA temperature-sensitive hydrogel fiber

以过硫酸钾(KPS)为引发剂,以二甲基亚砜为溶剂,通过自由基聚合的方法制备聚乙烯醇(PVA)接枝N-异丙基丙烯酰胺(NIPA)共聚物(PVA-g-PNIPA);用丙酮做凝固浴,通过湿法纺丝工艺和醛交联,制得具有温度响应性的PVA-g-PNIPA凝胶纤维并对其进行缩醛化处理;通过改变缩醛化处理时甲醛的用量,研究了不同缩醛度对PVA-g-PNIPA凝胶纤维的溶胀性能和力学性能的影响.结果表明:所制备的PVA-g-PNIPA凝胶纤维表现出明显的温度响应性能;随着缩醛化程度的增加,PVA-g-PNIPA凝胶纤维的溶胀度和溶胀速率都表现出下降趋势,而其力学性能显著增强.

PVA-g-PNIPA copolymer is synthesized through radical polymerization using potassium peroxodisulfate（KPS） as initiator and dimethyl sulfoxide（DMSO） as solvent.Then the PVA-g-PNIPA hydrogel fiber is prepared by spinning the blending solution in acetone solution and is treated by formaldehyde under acidic condition.The influence of the concentration of formaldehyde on the swelling performance and mechanical properties of hydrogel fibers is studied.The results show that PVA-g-PNIPA hydrogel fiber pocesses obvious temperature-sensitivity.With the increase of the concentration of formaldehyde,the swelling ratio and swelling rate of PVA-g-PNIPA fiber decrease while the mechanical properties are strenghthened obviously.