不同交联程度聚羟基氨基甲酸酯的合成及其表征

Synthesis and Characterization of Polyhydroxyurethanes with Different Crosslinking Degree

通过将不同比例的三羟甲基丙烷三缩水甘油醚型五元环状碳酸酯(5CC-TMPTGE)和二官能度聚丙二醇二缩水甘油醚型五元环状碳酸酯(5CC-PPGDGE)进行混合,再与乙二胺进行反应制备聚羟基氨基甲酸酯(PHU)。5CC-TMPTGE的引入改善了PHU的交联密度,从而改善产物的性能。实验结果表明,交联密度最高的PHU-3具有4.5%的低溶胀度和98.4%的高凝胶含量,相应的拉伸强度和玻璃化转变温度也分别达到26.8 MPa和78.3℃,其热失重试验质量损失50%时的温度最高。

A series of polyhydroxyurethanes(PHUs)were prepared by reacting ethylenediamine with cyclic carbonate which were mixed different proportions of(tri-methylolpropanetriglycidyl ether)-based five-membered cyclic carbonate(5CC-TMPTGE)and(polypropylene glycol diglycidyl ether)-based five-membered cyclic carbonatein(5CC-PPGDGE).The cross-linking density of PHU was increased by addition of 5CC-TMPTGE content,thereby improving the performances of products.The results showed that the PHU-3 with the highest cross-linking density had swelling degree of 4.5%and gel content of 98.4%.Its tensile strength and glass transition temperature were 26.8 MPa and 78.3℃,respectively.The temperature of PHU-3 was the highest when its mass loss was 50%in the TGA test.