石墨烯对全同聚1-丁烯结晶性能的影响

Effect of GE on crystallization behavior of 1-iPB

通过溶解-絮凝法制备了全同聚1-丁烯(1-iPB)/石墨烯(GE)复合材料,采用差示扫描量热仪研究了纯1-iPB和1-iPB/GE复合材料的结晶性能,使用偏光显微镜观察了其等速率降温结晶和等温结晶情况。结果表明:GE起到了异相成核剂的作用,GE使1-iPB的结晶温度明显提高,从纯1-iPB的67.7℃提高到77.3℃,结晶半峰宽变窄;等速率降温结晶时,1-iPB/GE复合材料出现晶体的温度高于纯1-iPB,GE提高了基体的结晶温度;85℃等温结晶时,1-iPB/GE复合材料晶体长满整个视野的时间低于纯1-iPB,结晶速率明显比纯1-iPB快,且晶粒数目多,粒径小。

Isotactic poly(1-butene)/graphene(1-iPB/GE)composites were prepared via solutioncoagulationmethod.The crystallization behavior of pure1-iPB and1-iPB/GE composites were observed bydifferential scanning calorimeter.The constant cooling crystallization and isothermal crystallization of thecomposites were surveyed by polarizing microscope.The results show that GE acts as heterogeneous nucleatingagent to improve the crystallization temperature of pure1-iPB from67.7℃to77.3℃,and narrows the halfwidth of peak.The crystallization appears in1-iPB/GE composites at higher temperature than that in pure1-iPB under constant cooling circumstances,which means GE can improve the crystallization temperature ofmatrix.The1-iPB/GE composites crystals cover the entire view faster than pure1-iPB ones under isothermalcrystallization at85℃,which means the higher crystallization rate of1-iPB/GE composites as well as moregrains grown in small particle size.