超支化环氧树脂增韧增强双酚A型环氧树脂

Toughness and Strength Improvement of Diglycidyl Ether of Bisphenol-A by Hyperbranched Epoxy Resin

利用液体型超支化环氧树脂HTME-2与双酚A型环氧树脂杂化复合,研究其固化物的力学性能和热性能.杂化树脂的力学性能随超支化环氧树脂的含量的增加先增加后下降,有最大值;超支化环氧树脂的用量为9wt%左右时,能使体系的拉伸强度、弯曲强度、冲击强度和断裂韧性分别提高17%、20%、177%和70%以上,但玻璃化转变温度下降.利用SEM、DSC、DMA和分子模拟技术研究杂化树脂的增韧增强机理、超支化环氧树脂的结构形态和分子尺寸.

This paper studied the use of liquid hyperbranched aromatic polyester epoxy resin （HTME-2） as an additive to an epoxy amine resin system. HTME-2 as modifiers in the diglycidyl ether of bisphenol-A （DGEBA） amine systems was discussed. It was shown that the HTME-2 content had important effect on the performance of the cured system, and the performance of the HTME-2/DGEBA blends had its maximum with the increase of its content. The impact strength and fracture toughness of the cured system with 9wt% HTME-2 were almost 2.77 and 1.66 times respectively of DGEBA performance. Furthermore, the tensile and flexural strength could be enhanced by about 17 % and 20 % respectively. The glass transition temperature, however, was found to decrease to rome extent. SEM, DMA and molecular simulation technology were applied to study the toughness and strength improvement mechanism of rigid organic particle. The three - dimensional size and structure shape of HTME-2 were displayed with molecular simulation technology.