超支化聚氨酯增韧环氧树脂的性能研究

Influence of hyperbranched polyurethane on property of epoxy resin

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。

Hyperbranched polyurethane （HBPU） was used to toughen epoxy resin. HBPU/EP composite was prepared and its meehanical and heat properties were tested. Impact fracture morphology was observed with SEM. The results indicated that the impact strength of the composite was increased to 32.02 kJ. m^2 （the maximum value ） by a factor of 2 using a 10% weight content. Flexural property was also improved to the same trend. Mechanical properties of the composite was improved with the increase of the generation. The composites section was stress-whitening phenomenon and the images of SEM showed cell-like conditions. This further verified the toughening mechanism of cavitation and phase separation theory. The Tg of the composite was decreased with the increase of the added amount and increased with increase of the generation.