ZnCl2改性低熔点PA6的结晶及力学性能研究

摘要

利用熔融共混法制备了不同氯化锌(ZnCl2)用量下的聚酰胺6(PA6)/ZmCl2复合材料,分别采用差示扫描量热仪(DSC)、动态力学分析仪(DMA)、电子拉伸机等对不同ZnCl2用量下PA6/ ZnCl2复合材料的结晶行为及力学性能进行了研究.结果表明:随着ZnC12用量的增加,PA6/ZnCl2复合材料的拉伸强度和弯曲强度均呈现先增大后减小的趋势,当ZnCl2质量分数为5％时,复合材料的拉伸强度和弯曲强度分别达到最大值70.39 MPa和64.71 MPa,较纯PA6分别增加了7.5％和降低了28％;随着ZnCl2用量的增加,PA6/ZnCl2复合材料的玻璃化转变温度逐渐增大,结晶能力下降,结晶度减小,结晶度由原来的34％变为13％.%PA6/ZnCl2 composites with different ZnCl2 contents were prepared by melt blending method.PA6/ZnCl2 composites were characterized by differential scanning calorimetry (DSC),Dynamic mechanical analyzer (DMA) and electronic tensile machine.The crystallization behavior and mechanical properties of PA6 / ZnCl2 composites with different ZnCl2 contents were studied.The results show that tensile strength and flexural strength of PA6/ZnCl2 composites increase first and then decrease with the increase of ZnCl2 content.When the mass fraction of ZnCl2 is 5％,the tensile strength and flcxural strength of PA6/ZnCl2 composites respectively reach the maximum value of 70.39 MPa and 64.71 MPa,compared with pure PA6 increased by 7.5％ and decreased by 28％.With the increasing of ZnCl2 content,the glass transition temperature of PA6/ZnCl2 composite gradually increases,while crystallization ability and the crystallinity decreases.The crystallinity decreases from 34％ to 13％.