PET／HDPE共混物的形态结构及力学性能的研究

STUDIES ON MORPHOLOGY AND MECHANICAL PROPERTIES OF PET/HDPE BLENDS

利用ＩＲ、ＳＥＭ、ＤＳＣ和力学测试等分析方法，研究了熔融接枝高密度聚乙烯（ＨＤＰＥ－ｇ－ＭＡ）和界面改性剂（ＩＭ）对ＰＥＴ／ＨＤＰＥ共混物形态结构、界面偶联状况和力学性能的影响。结果在明，ＨＤＰＥ－ｇ－ＭＡ改善了ＰＥＴ与ＨＤＰＥ的相容性，使ＨＤＰＥ较均匀地分散在ＰＥＴ基体中，但并未检测到ＰＥＴ／ＨＤＰＥ－ｇ－ＭＡ界面有化学反应发生。界面改性剂的作用在于，一方面通过提高ＰＥＴ基体的粘度，并接近ＨＤＰＥ相的粘度而使分散相细化；另一方面通过与ＨＤＰＥ－ｇ－ＭＡ和ＰＥＴ的偶联反应而增强了ＰＥＴ／ＨＤＰＥ－ｇ－ＭＡ界面粘结，从而显著地提高了共混物的抗冲击性能。

Effects of HDPE-g-MA and interfacial modifier(IM) on morphology,interfacial adhesion and mechanical properties of PET/HDPE blends were studied by IR, SEM, Rheometer, DSC,etc. The results show that HDPE-g-MA improves the compatibility between PET and HDPE,leading to homogeneous dispersion of HDPE in PET matrix. But. the chemical reaction between TET and HDPE-g-MA has not been detected. The role of the interfacial modifier lies in decreasing the diameter of dispersed phase by increasing the melt viscosity of PET, and improving the interfacial adhesion by reacting with PET and HDPE-g MA,therefore,improves significantly the imopact strength of the blends.