SS/PNIPAm互穿网络水凝胶的合成及其改性棉纤维的结构与热性能研究

采用聚合物互穿网络(IPN)技术,将生物相容性丝胶蛋白作为第二网络与第一网络聚N-异丙基丙烯酰胺进行原位聚合,在水溶液中制得具有互穿网络结构的丝胶基水凝胶(IPNs)。以戊二醛为交联剂,采用浸渍法将IPNs水凝胶对棉织物进行改性处理。采用称量法对水凝胶溶胀性和最大溶胀度进行表征;利用扫描电镜(SEM)、傅里叶红外光谱(FT-IR)和热失重(TGA)方法表征IPNs水凝胶及其改性棉织物的结构与性能。结果表明,IPNs水凝胶均匀附着在棉纤维表面,丝胶具有良好的亲水性,高分子质量丝胶的引入增加了亲水性基团,提高了体系的亲水性;IPNs/Cotton-1～IPNs/Cotton-4的热稳定性均明显好于未改性棉织物;改性棉织物的结晶度也有所提高。

Synthesis of a sericin-poly(N-isopropylacrylamide) interpenetrating polymer network hydrogel and structure and thermal properties of cotton fabric modified with SS/PNIPAm

The sericin-based hydrogels(IPNs) with interpenetrating network structure was synthesized by in-situ polymerization of biocompatible sericin as the second network and poly(N-isopropylacrylamide) as the first network through polymer interpenetrating network(IPN) technology. Using glutaraldehyde as crosslinking agent, the cotton fabric was modified with IPNs hydrogel through impregnation method. The swelling prop-erty and maximum swelling degree of hydrogels were characterized by weighing method. The structure and properties of IPNs hydrogel and modified cotton fabric were characterized by scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FT-IR) and thermogravimetric analysis(TGA). The results showed that IPNs hydrogel was uniformly attached to the surface of cotton fibers, and sericin had good hydro-philicity. The introduction of high molecular weight sericin increased hydrophilic groups and improved the hy-drophilicity of the system. The thermal stability of IPNs/Cotton-1 to IPNs/Cotton-4 was significantly better than that of unmodified cotton fabric. The modified cotton fabric had higher crystallinity than pure cotton.