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以聚酰胺11(PA11)和热塑性聚氨酯弹性体(TPU)为原料,4,4’-二苯甲烷二异氰酸酯(MDI)为增容剂,采用熔融共混法制备PA11/TPU复合材料。研究不同含量的MDI对复合材料的力学性能、微观形态及非等温结晶性能的影响。结果表明:随着MDI含量的增加,复合材料的拉伸强度增大,冲击强度先增大后减小。当MDI含量为0.8%时,复合材料的力学性能达到最佳,拉伸强度为66.3 MPa,断裂伸长率为123%,冲击强度达到10 k J/m2,较不加MDI的复合材料增加了45%,此时PA11和TPU的相容性较好,分子间交联程度适中。非等温结晶分析表明:Mo法适用于处理PA11/TPU复合材料的非等温结晶过程;在非等温结晶过程中,MDI的加入对复合材料的非等温结晶行为产生影响,MDI的加入抑制了分子链的运动,使结晶速率下降。
PA11 / TPU composites were prepared by melt blending with polyamide 11 (PA11) and thermoplastic polyurethane elastomer (TPU) as raw materials and 4,4’-diphenylmethane diisocyanate (MDI) as compatibilizer. The effects of different contents of MDI on the mechanical properties, microstructure and non-isothermal crystallization of composites were studied. The results show that with the increase of MDI content, the tensile strength of the composites increases and the impact strength first increases and then decreases. When the MDI content is 0.8%, the mechanical properties of the composites are optimized, the tensile strength is 66.3 MPa, the elongation at break is 123% and the impact strength is 10 kJ / m2, which is higher than that of the composite without MDI 45%, at this time PA11 and TPU better compatibility, moderate degree of cross-linking between molecules. The non-isothermal crystallization analysis shows that the Mo method is suitable for the non-isothermal crystallization of PA11 / TPU composites. In the non-isothermal crystallization process, the addition of MDI has an effect on the non-isothermal crystallization behavior of the composites. The addition of MDI inhibits the molecular chain The movement, the crystallization rate decreased.