含双硫键的自修复交联聚氨酯弹性体的合成与性能  

Synthesis and Characterization of Cross-linked Self-healable Polyurethane Elastomer Containing Disulfide Bonds

作　　者：黄晓文 张士玉[1] 赵凯锋 白亚朋 魏燕彦[1] HUANG Xiao-wen;ZHANG Shi-yu;ZHAO Kai-feng;BAI Ya-peng;WEI Yan-yan(Qingdao University of Science and Technology ,Qingdao 266042 ,Chin)

机构地区：[1]青岛科技大学高分子科学与工程学院,青岛266042

出　　处：《高分子通报》2018年第5期67-72,共6页Polymer Bulletin

基　　金：国家自然科学基金资助(51103078)

摘　　要：采用预聚法,以多官能度聚醚多元醇和异佛尔酮二异氰酸酯为原料,β-巯基乙醇为封端剂制备多官能度巯基封端聚氨酯低聚物,利用Na I/H2O2将巯基氧化为双硫键,获得含双硫键的交联型聚氨酯。通过FTIR研究了产物的化学结构及组成,采用拉伸测试和对比试验等测试方法对自修复条件、自修复效率以及双硫键和氢键在自修复过程中的作用进行了分析。结果表明,制得的含脂肪族双硫键的交联聚氨酯可以在室温下实现高效自修复,而且不需要额外的催化剂和外界刺激条件。用刀片将试样切成两半后对接紧密在自然光线下放置48h后拉伸强度可恢复到原来的95%,断裂伸长率恢复到原来的100%。其中,聚氨酯的氨基甲酸酯键之间形成的氢键提供30%左右的自修复效率。By Prepolymer Process, the polyfunctional thiol terminated polyurethane oligomer was prepared with polyfunctional polyether polyols, isophorone diisocyanate （IPDI）, and by adding an end-capping reagent-mercaptoethanol. The crosslinked polyurethane containing disulfide bonds was then polymerized by oxidative coupling of the thiol moieties using sodium iodide/hydrogen peroxide. The resultant polymers were characterized by FT-IR. The effect of self-healing condition, self-healing efficiency, the function of disulfide bond and hydrogen bond in self-healing process were analyzed by means of tensile test and contrast test, etc. The results showed that the crosslinked polyurethane containing aliphatic disulfide bonds can achieve efficient self-healing at room temperature, and does not require additional catalyst and external stimulus. After being cut in half with a razor blade and simple contact, the samples were exposed to natural light for 48 hours, the tensile strength can be restored to 95% of the original, and the elongation at break can be restored to 100% of original, which hydrogen bonds among urethane moieties contributed up to about 30% of the healing efficiency.

关 键 词：交联型聚氨酯 巯基 双硫键 自修复 动态可逆共价键 

分 类 号：TQ334.1[化学工程—橡胶工业]