基于自组装行为的微球复合水凝胶制备及性能

Preparation and Properties of Microsphere Composite Hydrogels Based on Self-Assembly Behavior

以超支化的聚乙烯亚胺和烯丙基缩水甘油醚通过环氧开环反应制备了具有温敏性的聚合物,该温敏性聚合物在水溶液中表现出相转变行为,当达到临界温度时能够自组装形成微球。以该微球为交联剂、丙烯酰胺为单体原位在室温下制备出一种微球复合水凝胶(MCH)。力学性能测试表明,制备的微球复合水凝胶具有优异的力学性能,断裂伸长率达到2800%。流变行为分析表明,该凝胶是一种黏弹性材料,其网络结构兼具物理和化学双重交联。此外,凝胶还表现出良好的形变能力,循环拉伸测试表明其结构中存在明显的能量耗散机制。

A thermo-sensitive polymer was prepared by epoxy ring-opening reaction using hyperbranched polyethylenimine and allyl glycidyl ether.In aqueous solution,the thermo-sensitive polymer exhibits phase transition behavior and could self-assemble into microspheres when a critical temperature is achieved.Then,a novel microsphere composite hydrogel was synthesized by the microspheres and acrylamide.The obtained hydrogels have excellent mechanical properties of which the elongation at break could reach 2800%.The rheology test indicates that the hydrogels are viscoelastic and their network structure has both physical and chemical crosslinkings.In addition,the hydrogels also show a good deformability,and the cyclic tensile test shows that there is the obvious energy dissipation mechanism in its structure.