聚氨酯增韧改性PISOX树脂及其复合材料的性能  

Properties of PISOX Resin Toughened by Polyurethane and Its Composite Material

作　　者：王成忠[1,2] 付晓琦[1] 王连毅[1] 黄丽[1,2] 

机构地区：[1]北京化工大学材料科学与工程学院,北京100029 [2]北京市水性聚合物合成与应用工程技术研究中心,北京100029

出　　处：《宇航材料工艺》2016年第1期60-64,共5页Aerospace Materials & Technology

摘　　要：利用MDI与PTMG-2000制备聚氨酯预聚体,对聚(异氰脲酸酯-噁唑烷酮)树脂(PISOX)进行增韧改性:考察不同I/E、不同预聚体添加量的树脂浇铸体力学性能的变化;并对最优配方进行复合材料力学性能测试和DMTA测试,比较改性前后复合材料力学性能和耐热性能的变化;利用SEM观察改性前后微观形态的变化,推测增韧机理。结果表明,I/E=1.8、添加15%预聚体时树脂浇铸体综合力学性能最优,弯曲强度、弯曲模量、冲击强度分别为60.92 MPa、2 295 MPa、6.40 k J/m2;利用该基体制备复合材料,具有比未改性体系更优异的力学性能和界面性能,且聚氨酯预聚体的引入对树脂在高温下的耐热性能没有明显影响,其玻璃化转变温度均在258℃左右;对比改性前后体系固化物的微观结构,改性后的体系呈两相结构,橡胶相起到吸收冲击能和终止裂纹的作用,有效地提高了材料的韧性。PISOX was modified by polyurethane prepolymer which was synthesized by MDI and PTMG- 2000 to strengthen toughness. The variation of resin mechanical properties with different I / E ratio and content of prepolymer were characterized. The composite mechanical properties and the heat resistant property of modified resin and unmodified resin investigated by universal testing machine and DMTA,were compared. The variation of micromorphology was observed by SEM to speculate toughening mechanisms. The results suggested that the composite material had the best mechanics performance when I / E ratio is 1. 8 and the content of prepolymer is 15%. The bending strength,bending modulus,impact strength is 60. 92 MPa,2 295 MPa,6. 40 k J / m^2,respectively. The DMTA showed that the addition of prepolymer had little effect on the heat resistance of the resin at high temperature. The glass transition temperature is 258℃. Composite material prepared by this resin had better mechanical properties and interfacial properties. By comparing the microstructure of the cured material,we can conclude that the modified system is two phase structure,rubber phase played the role of absorbing impact energy and terminating crack,whic can improve the toughness of the material effectively.

关 键 词：聚氨酯增韧 聚(异氰脲酸酯-噁唑烷酮)树脂 复合材料 力学性能 耐热性能 

分 类 号：TB332[一般工业技术—材料科学与工程]