MXD6/PA6/EPT共混物的相容性研究∗

摘要

以马来酸酐接枝乙烯丙烯热塑性弹性体(EPT-g-MAH)为反应性增容剂,通过熔融共混方法制得聚间苯二甲胺己二酸/聚酰胺6/乙烯丙烯热塑性弹性体(MXD6/PA6/EPT)共混物。采用 Molau 实验、动态流变仪、扫描电子显微镜、傅里叶变换红外光谱仪和红外近红外成像系统等分析研究了 EPT 的分散性能以及 MXD6/PA6/EPT共混物的流变性能和形态结构。实验结果表明,PA6与EPT-g-MAH 发生原位化学反应生成的 EPT-b-PA6嵌段共聚物是增容 MXD6/EPT 共混体系的根本原因；MXD6/PA6/EPT/EPT-g-MAH 共混体系的储能模量(G′)、损耗模量(G″)以及复数粘度(η)均高于 MXD6/PA6/EPT 共混体系,且在低频区增加幅度更为明显；EPT-g-MAH 的引入导致共混体系的相分离温度升高、时温叠加频率适用范围增大；EPT-g-MAH 的引入增强了EPT与MXD6界面相互作用,分散相EPT在MXD6基体中分散更加均匀、尺寸明显减小。%In this paper,poly(m-xylene adipamide)/polyamide 6/ethylene propylene terpolymer(MXD6/PA6/EPT)blends were obtained by melt blending method,and EPT grafted maleic anhydride (MAH)was used as a reactive compatibilizer in this process.The dispersion performance of EPT and rheological property,morpho-logical structure of MXD6/PA6/EPT blends were studied by Molau test,dynamic rheometer,scanning electron microscopy,FT-IR spectrometer and infrared near infrared imaging system.The experimental results showed that EPT-b-PA6 block copolymer was the root cause of compatibilizing MXD6/EPT blend system,which was generated by PA6 and EPT-g-MAH through situ chemical reaction.The energy storage modulus (G′),loss modulus (G″)and complex viscosity (η)of MXD6/PA6/EPT/EPT-g-MAH blend system were higher than MXD6/PA6/EPT blend system’s,and increased more obviously in low frequency area.The introduction of EPT-g-MAH improved phase separation temperature,broadened the scope of applications of time temperature super-position frequency and enhanced interface interaction between EPT and MXD6.Meanwhile,the dispersed phase EPT dispersed more evenly in MXD6 matrix and its size reduced significantly.