摘要
用同步聚合法制备了一系列HTPB和液化MDI型聚氨酯与聚苯乙烯的共混材料,运用FTIR,DSC,TG,SEM和拉力实验机对共混物的反应进度、玻璃化转变温度、热稳定性、力学性能和微观形态进行考查。结果表明,共混体系在同步聚合过程中,PU的形成速率明显大于PS的聚合速率。共混材料具有比纯组分较好的热稳定性,其玻璃化温度高温段Tg2外移且程度不大,力学性能显示随着共混物中PS组成的减少材料的拉伸强度和硬度逐渐减小,断裂伸长率先增加后减小,冲击强度增大。共混材料的微观形态呈两相分离,相转变发生在PU/PS组成质量比在15∶85到30∶70之间。
A series of blends polymers has been prepared by the simultaneous polymerization process respectively with different composition of the HTPB/liquefication MDIbased polyurethane and polystyrene.The reaction degree,glass transition temperature ,thermal stability,mechanical properties and morphological structure of the system were investigated by FTIR,DSC,TG,SEM and Instron Tester.The results showed that the formation rate of PU was obviously faster than that of PS during the process of simultaneous polymerization in the system of blends.the blends exhibited a better thermal stability than the pure polymer and the glassy transition temperature Tg2 increased but the degree was very little.Mechanical properties showed that the tensile strength,the hardness and the impact strength of the blends increase with the PS content increase.The elongation of break increased at first,but then decreased..The morphological structure of the blends exhibited two phase separetion and phase inversion occured at a composition between the 15:85 to the 30:70 PU/PS blends.
出处
《弹性体》
CAS
2002年第6期23-27,共5页
China Elastomerics
基金
湖南省自然科学基金项目(01JJY3011)
