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利用双螺杆挤出机制备了聚甲醛(POM)/热塑性聚氨酯弹性体(TPU)、POM/TPU/含异氰酸酯基的低聚物(Z)以及POM/TPU/Z/聚醚3种共混物。采用力学性能测试、差示扫描量热分析(DSC)、偏光显微镜(PLM)、傅里叶转换红外线光谱(FTIR)、扫描电子显微镜(SEM)、动态力学性能分析(DMA)等,研究了3种共混物的力学性能、结晶行为及形态结构。结果表明:共混物的缺口冲击强度和断裂伸长率随TPU含量的增加而提高;异氰酸酯基低聚物(Z)和聚醚在促进分散相分散、增强两相间的相容性方面发挥重要作用,降低了聚甲醛的结晶度,能够有效地提高共混物的缺口冲击强度和断裂伸长率。
Polyoxymethylene (POM) / thermoplastic polyurethane elastomer (TPU), POM / TPU / isocyanate group containing oligomer (Z) and POM / TPU / Z / polyether blend were prepared by twin screw extruder . The mechanical properties, DSC, PLM, FTIR, SEM, DMA and so on were studied. The effects of 3 The mechanical properties, crystallization behavior and morphological structure of the blend. The results show that the notched impact strength and elongation at break of the blends increase with the increase of the content of TPU. Isocyanate-based oligomers (Z) and polyethers play an important role in promoting disperse phase dispersion and enhancing the compatibility between two phases Role, reducing the degree of crystallinity of POM, can effectively improve the notched Izod impact strength and elongation at break.