摘要： 为了解决杜仲胶结晶性导致的溶解性差的问题，以便其直接用于改性涂料、黏合剂，基于巯基-烯点击化学反应，采用巯基乙醇与杜仲胶在 365 nm紫外光照射条件下合成了羟基化杜仲胶（HEUG），以破坏其结晶性，增强溶解性能。同时，研究了杜仲胶羟基化改性中水、N，N-二甲基甲酰胺、氯仿为溶剂、碳碳双键与巯基的物质的量比与反应时间等对羟基化程度的影响。研究了羟基化杜仲胶对自修复聚氨酯（DSPU）涂层的力学性能、柔韧性、耐溶剂性、附着力以及自修复性能的影响。研究表明，改性后的杜仲胶在常见溶剂中具有优良的溶解性能，且羟基化改性时溶剂为氯仿、反应时间为 6h、巯基与碳碳双键物质的量比为 3∶1时，羟基化程度最高，为 156 mgKOH/g。将 HEUG与自制的自修复聚氨酯树脂复合时，HEUG用量为 5%是最优添加量，此时涂层的力学性能强、断裂伸长率高、自修复快、透明度高、涂层的基本性能良好。

关键词: 羟基化杜仲胶, 聚氨酯, 自修复涂层, UV固化

Abstract: In order to address the poor solubility of Eucommia ulmoides gum（EUG）caused by its crystallinity，so that its direct use in modified coatings and adhesives，we synthesized hydroxylated Eucommia ulmoides gum（HEUG） by reacting thiol-ethanol with
EUG under 365 nm UV light using thiol-ene click chemistry. This process disrupted the crystallinity and enhances solubility. We investigated the effects of different solvents（water，N，N-dimethylformamide，chloroform），molar ratios of C=C double bonds to thiol groups，and reaction times on the degree of hydroxylation of EUG. Additionally，we studied the impact of hydroxylated EUG on the mechanical properties，flexibility，solvent resistance，adhesion，and self-healing performance of self-healing polyurethane（PU） coatings. The results indicatedthat the modified EUG exhibited excellent solubility in common solvents. The highest degree ofhydroxylation，156 mgKOH/g，was achieved using chloroform as the solvent，a reaction time of 6 hours，and a thiol to C=C double bond molar ratio of 3：1. When HEUG was combined with self-made self-healing polyurethane（DSPU）resin，the optimal addition amount was found to be 5% by mass. At this concentration，the coating demonstrated strong mechanical properties， high elongation，rapid self-healing，high transparency，and overall good performance. 

Key words: hydroxylated Eucommia ulmoides gum, polyurethane, self-repairing coating, UV-curable

中图分类号: 

• TQ637. 8