明胶/聚丙烯酸/聚N-异丙基丙烯酰胺高强度形状记忆水凝胶的辐射合成及其性能  

Radiation synthesis and properties of gelatin/polyacrylic acid/poly(N-isopropyl acrylamide)shape-memory hydrogels with high strength

作　　者：陈垦 彭静[1] 李久强[1] 翟茂林[1] CHEN Ken;PENG Jing;LI Jiuqiang;ZHAI Maolin(Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science,College of Chemistry and Molecular Engineering,Beijing National Laboratory for Molecular Science,Peking University,Beijing 100871,China)

机构地区：[1]北京大学化学与分子工程学院北京分子科学国家研究中心放射化学与辐射化学重点学科实验室,北京100871

出　　处：《辐射研究与辐射工艺学报》2020年第4期25-32,共8页Journal of Radiation Research and Radiation Processing

基　　金：国家自然科学基金项目(11875078)资助。

摘　　要：以明胶、丙烯酸、N-异丙基丙烯酰胺、N,N′-亚甲基双丙烯酰胺为原料,通过两步辐照法制备了具有温度和pH响应的高强度明胶/聚丙烯酸/聚N-异丙基丙烯酰胺形状记忆水凝胶(GAN)。系统研究了GAN的结构、形貌、力学性能和形状记忆行为。结果表明,GAN具有致密的网络结构,其最高拉伸强度及最大断裂伸长率分别可达(5.4±0.3)MPa和745%。GAN在60℃及pH=12.8的形状恢复所需时间分别为10 s及15 min,形状固定率和形状恢复率均在90%以上,显示出优异的环境响应性能。本工作建立了一种制备环境响应型高强度形状记忆水凝胶的新方法。A novel gelatin/polyacrylic acid/poly(N-isopropyl acrylamide)shape-memory hydrogel(GAN)with temperature and pH response and high strength was prepared by two-step irradiation method,with gelatin as matrix,acrylic acid(AAc)and N-isopropyl acrylamide(NIPAm)as monomers,and N,N′-methlene bisacrylamide(MBA)as crosslinking agent.The structure,morphology,mechanical properties,and shape-memory behavior of GAN were investigated in detail.The results showed that GAN has a dense network structure,and excellent mechanical properties with the maximum tensile strength up to(5.4±0.3)MPa,and the maximum elongation at break of 745%.GAN’s shape recovery time at 60℃and pH=12.8 can be controlled within 10 s and 15 min,with a shape fixation rate and shape recovery rate above 90%,respectively.This work provides a new method for the preparation of environmentally responsive high-strength shape-memory hydrogels.

关 键 词：形状记忆水凝胶 明胶 丙烯酸 N-异丙基丙烯酰胺 辐射合成 

分 类 号：TL13[核科学技术—核能科学]