论文部分内容阅读
采用超支化聚氨酯(HBPU)作为增韧剂,制备环氧树脂的复合材料,并测试其力学性能和热学性能,并对复合材料的断面进行微观形貌表征。结果表明:在HBPU的含量在10%(质量分数)时,冲击强度达到最大值(强度为32.02kJ·m-2)材料的冲击强度提高将近200%,弯曲性能也有所提高同样的变化趋势。复合材料的力学性能随着代数的增大而增大。复合材料的断面呈应力发白现象,电镜图片也呈现出蜂窝状,进一步验证了超支化聚氨酯的空穴化和相分离理论韧性机理的合理性。复合材料的Tg随添加量增加而下降,随代数增加而增加。
The hyperbranched polyurethane (HBPU) was used as the toughening agent to prepare the epoxy resin composites. The mechanical and thermal properties of the epoxy composites were tested. The cross-sections of the composites were characterized by micro-morphology. The results show that when HBPU content is 10% (mass fraction), the impact strength reaches the maximum value (strength of 32.02kJ · m-2), the impact strength of the material increases nearly 200%, and the bending performance also has the same trend of increasing. The mechanical properties of composites increase with the increase of algebra. The cross-section of the composite material presented a stress whitening phenomenon, and the electron microscope image also showed a honeycomb shape, further verifying the rationality of the theoretical toughness mechanism of hyperbranched polyurethane cavitation and phase separation. The Tg of the composites decreases with the increase of addition amount, and increases with the increase of the algebra.