等规聚丁烯-1与等规聚丙烯间界面的结构与性能研究

Study on the Interface Structure and Bond Properties Between Isotactic Polybutene-1 and Isotactic Polypropylene

基于构建的iPB-1与iPP的双层热压复合膜,设计两相界面结构,并通过撕裂实验、扫描电子显微镜(SEM)和透射电子显微镜(TEM),研究高温退火温度与结晶温度对iPB-1与iPP间界面结构和性能的影响.结果表明,iPB-1/iPP复合样品经退火处理后,界面黏结强度明显下降,且退火温度越高,界面黏结强度和撕裂面粗糙度均越低.另外,经高温退火及两步降温结晶(即iPP于130℃先结晶、iPB-1于60℃后结晶)后,样品的平均界面黏结强度、撕裂面粗糙度、界面层厚度均比经一步降温结晶(iPP和iPB-1于60℃同时结晶)后的更高,且出现iPB-1分子链向iPP相区扩散的界面相结构.

Blending of isotactic polybutene-1(iPB-1)and isotactic polypropylene(iPP)is a facile way to obtain polymer materials with excellent performance.However,the interfacial structure that determines the properties of the iPB-1/iPP blends has rarely been studied.In this study,a bilayer film of iPB-1 and iPP that was fabricated by hot-pressing was used to analyze the influence of thermal annealing temperature and crystallization temperature on the interfacial structure and bond properties of iPB-1/iPP blend via tearing experiment,scanning electron microscope(SEM),and transmission electron microscope(TEM)observation.It is found that the interfacial bonding strength of iPB-1/iPP blends significantly decreased with the thermal annealing,and the higher annealing temperature resulted in the lower interfacial bonding strength and a lower rough tear surface.Also,the iPB-1/iPP blend that underwent two-step crystallization involving the crystallization of iPP at 130℃and then the crystallization of iPB-1 at 60℃after thermal annealing exhibited a higher interfacial bonding strength and a rougher tear surface than those of the samples which underwent one-step crystallization involving the crystallization of iPP and iPB-1 at 60℃.After two-step crystallization,a thicker interfacial layer was observed by TEM,and the diffusion of iPB-1 molecular chains towards the iPP phase region was also observed.