PE-UHMW对聚甲醛力学性能及非等温结晶的影响研究

制备了一系列聚甲醛/超高相对分子质量聚乙烯（POM/PE-UHMW）共混物,并通过力学性能测试,差示扫描量热仪及扫描电子显微镜等分析了共混物的结构和性能,分别采用Avrami以及莫志深理论对POM及POM/PE-UHMW(100/1)非等温结晶动力学进行了理论分析,利用Kissinger方法对其结晶活化能进行了计算。结果表明,当PE-UHMW含量为1 %(质量分数，下同)时，共混物的缺口冲击强度达到最大值，较纯POM提高了约24.3 %；同时其降低了POM的结晶速率和结晶活化能,但相对结晶度稍有提高。

Effect of PE UHMW on Mechanical Properties and Nonisothermal Crystallization of Polyoxymethylene

Blends of polyoxymethylene(POM)/ultra high molecular weight polyethylene(PE-UHMW) were prepared. The structure and performance of the blends were analyzed by mechanical property testing, DSC and SEM. When the content of PE UHMW was 1 wt %, the notched impact strength of the blends was 1.24 folds that of neat POM. Two methods, namely, Avrami and Mo, were used to analyze the nonisothermal crystallization kinetics of POM and POM/PE-UHMW(100/1)blends. The activation energy was evaluated by the Kissinger method. The crystallization rate and crystallization activation energy of POM decreased with adding 1 wt % PE UHMW, while the crystallinity increased.