尼龙—6与马来酸酐接枝聚乙烯共混体系的结晶行为、流变性能以及界面状态的研究

Thermal Rheological Behavior and Interfacial State of Nylon-6/LDPE-g-MAH Blends

本文利用ＤＳＣ、毛细管流交仪及扫描电子显微镜等手段，对尼龙—６／马来酸酐接枝聚乙烯体系的结晶行为、熔体流变性能以及界面状态进行了研究。结果表明：共混物是热力学不相容体系，由于接枝聚乙烯与尼龙的化学反应改善了二者的相容性、分散及界面状况明显改善，同时也影响了共混体系的结晶行为和熔体的流变性能．尼龙—６／接枝聚乙烯共混体系中，尼龙相的ΔＨｆ（ｂｌｅｎｄ）、ΔＨｅ（ｂｌｅｎｄ）和Ｔｅ均低于理论值，共混物的Ａｖｒａｍｉ指数较纯尼龙大。聚乙烯或接枝聚乙烯的加入对尼龙相的结晶具有成核作用．共混体系的熔体粘度大于纯尼龙，与尼龙—６／聚乙烯体系相比，接枝共混体系的熔体粘度更高．

Using DSC, Chpillare rheometer and SEM, the thermal, rheological behavior and interfacial state of Ny-6/LDPE-g-MAH blends were studied. It is found instead of LDPE, the adding of LDPEg-HAM will substantially improve both the disppersion of domain and the interfacial state of phases.It causes a decrease of ΔHf (blend), ΔHc (blend), and To of Ny-6 phase. The melts of blends are peudo-platic fluid. Compared with Ny-6/LDPE mechanital blends, the melt viscosities of the former is higher.