预拉伸对聚丁二酸丁二醇酯/碳纳米管复合材料结晶行为及力学性能影响

Effect of Pre-Stretching on the Crystallization Behavior and Mechanical Properties of Polybutylene Succinate/Carbon Nanotube Composites

以熔融共混法制备了碳纳米管(CNTs)增强的聚丁二酸丁二醇酯(PBS)复合材料,研究了预拉伸对PBS/CNTs复合材料结晶行为及力学性能的影响。CNTs的加入在复合材料中起到了异相成核作用,促进了PBS的结晶,提高了复合材料的力学性能。单轴预拉伸使CNTs与PBS分子链的有序程度同时增加,有序排列的CNTs进一步增加了PBS晶体的取向度,预拉伸与CNTs对复合材料的增强实现了协同作用。然而,加入CNTs以及在不同温度、不同拉伸应变下的预拉伸均未导致PBS晶体结构发生转变。经在60℃预拉伸500%的PBS/CNTs(质量分数5%)复合材料,其拉伸强度达到286.1 MPa、弹性模量达2.9 GPa,实现了对PBS的增强。

Carbon nanotubes(CNTs)reinforced polybutylene succinate(PBS)composites were prepared by melt blending.The effect of pre-stretching on the crystallization behavior and mechanical properties of PBS/CNTs composites was studied.The addition of CNTs plays a role in the heterogeneous nucleation of the composites,which promotes the crystallization of PBS and improves the mechanical properties of the composites.Uniaxial pre-stretching increases the order of CNTs and PBS molecular chains at the same time.Orderly arranged CNTs further increase the orientation of PBS crystals.Pre-stretching and the addition of CNTs enhance the composites to achieve a synergistic effect.However,the addition of CNTs and the pre-stretching at different temperatures and different tensile strains do not cause the PBS crystal structure to change.The PBS/CNTs(5%)composite material pre-stretched at 60℃by 500%has a tensile strength of 286.1 MPa and an elastic modulus of 2.9 GPa,realizing the enhancement of PBS.