高密度聚乙烯/尼龙6共混物的形态结构对其性能的影响

本文利用微层共挤方法制备了具有层状交替结构的HDPE/PA6共混物,利用常规熔融共混挤出方法制备了与层状共混物具有相同组成比的海岛结构共混物。通过DSC,FT-IR及力学性能测试等方法研究了共混物的形态结构对其界面化学反应、结晶行为和力学性能的影响。研究结果表明:在共混物中引入少量马来酸酐接枝高密度聚乙烯时,化学反应在界面进行,与海岛结构的共混物界面面积相比,层状共混物的界面接触面积小,界面化学反应相对较弱,但层状共混物的屈服强度和断裂伸长率有大幅度提高。层状结构对HDPE和PA6的结晶行为影响很小。

Effect of Morphology on the Properties of High Density Polyethylene/Polyamide 6 Composite

High density polyethylene(HDPE) and polyamide 6(PA6) composites with alternating layers were prepared by mcirolayer coextrusion,while the HDPE/PA6 blends with sea-island structure and the same composition by conventional blending.The effects of morphology on interfacial chemical reaction,crystallization behavior, and mechanical properties of the composites were characterized by DSC,FT-IR,and mechanical test.The results reveale that while compatibilizer is added into the composites,the interfacial chemical reaction occurs on the interface. Furthermore,the interfacial reaction of composites occurs weaker than the blends owing to the former has a smaller interface area.However,the composites have much higher yield strength and elongation at break than the blends.The alternating layer-like structure of composites shows a negligible influence on the crystallization behaviors of HDPE and PA6.