异氰酸酯反应增容PA11/TPU复合材料制备及性能  

Preparation and Properties of PA11/TPU Composites Compatibilized by Isocyanate

作　　者：王玉龙 王宇欣 徐永福 廖兴燕 李振中 

机构地区：[1]太原工业学院材料工程系,山西太原030008

出　　处：《塑料科技》2017年第12期43-47,共5页Plastics Science and Technology

基　　金：太原工业学院重点科学基金(2017LZ02)

摘　　要：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 method using polyamid11（PA11）, thermoplastic polyurethane elastomer（TPU） and 4,4＇-diphenylmethane diisocyanate（MDI） as raw materials. The effects of MDI content on mechanical properties, microstructure and non isothermal crystallization properties of the composites were investigated. The results show that： with the increase of MDI content, the tensile strength of the composite increases, and the impact strength increases first and then decreases. When the content of MDI is 0.8%, the mechanical properties of the composites reaches to the optimum, the tensile strength is 66.3 MPa, the elongation at break is 123%, and the impact strength is 10 k J/m2, which is 45% higher than that of the composites without MDI; The compatibility between PA11 and TPU is good, and the degree of intermolecular crosslinking is moderate. Non isothermal crystallization analysis shows that Mo method is suitable for the non isothermal crystallization process 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 composite, and the addition of MDI inhibits the movement of the molecular chain and decreases the crystallization rate.

关 键 词：聚酰胺11 热塑性聚氨酯弹性体 4 4'-二苯甲烷二异氰酸酯 反应增容 熔融共混 

分 类 号：TB332[一般工业技术—材料科学与工程]