聚丙烯酸酯改性环氧树脂的力学性能

通过丙烯酸乙酯(EA)和丙烯酸丁酯(BA)在环氧树脂中原位聚合,制备了聚丙烯酸酯改性的缩水甘油醚双酚A(DGEBA)-甲基四氢苯酐(MeTHPA)环氧树脂体系。原位聚合形成的聚丙烯酸酯在环氧树脂基体中形成"海-岛"结构。与纯环氧树脂基体相比,当丙烯酸酯质量分数为10%时,经PEA和PBA改性的聚丙烯酸酯/双酚A-MeTHPA体系的拉伸强度分别降低9.51%和4.00%,而拉伸弹性模量分别降低14.81%和9.52%;玻璃化温度变化不大;而冲击强度分别增加了26.5%和31.0%,断裂延伸率分别增加22.03%和30.07%,增韧效果明显。

Mechanical properties of epoxy systems modified by polyacrylates

Ethyl acrylate(EA) and butyl acrylate(BA) were employed to modify the diglycidyl ether of bisphenol A(DGEBA)-methyltetrahydrophthalic anhydride(MeTHPA) epoxy system via in-situ polymerization.The "sea-island" structure is observed from the SEM micrographs of the DGEBA-MeTHPA system modified by polyacrylates.By the addition of 10%(mass fraction) EA and BA,the tensile strength of the epoxy system reduces by 9.51% and 4.00%,and the modulus reduces by 14.81% and 9.52%,respectively.The glass transition temperature is not obviously influenced by the addition of polyacrylates.By contrast,the impact strength dramatically increases by 26.5% and 31.0%,and the elongation increases by 22.03% and 30.07%,respectively,showing obvious toughening effects.