摘要
与传统的双官能团环氧树脂相比,多官能团环氧树脂具有更高的交联密度,这赋予其更好的力学性能和耐热性,但却降低了环氧树脂的韧性。本文研究发现,同时加入热塑性树脂聚醚砜(PES)和亲水性二氧化硅纳米粒子(A200)可以显著提高TDE85环氧树脂的强度和韧性。当TDE85∶PES∶A200质量比=100∶5∶0.3时,复合材料的增强和增韧效果最佳,改性环氧树脂的拉伸强度和断裂伸长率分别提高了38.1%和29.4%,并且没有明显牺牲基体树脂的模量和耐热性。扫描电子显微镜(SEM)结果表明,改性后的环氧树脂呈现韧性断裂行为,其增韧机理可以解释为PES树脂和二氧化硅纳米粒子不同增韧机理的协同作用。
The higher crosslinking density of polyfunctional epoxies endows them with better thermal and mechanical properties but also lowers ductility than traditional bifunetional epoxies. Here, we demonstrated that a noticeable strengthening and toughening of trifunctional epoxy （TDE85） could be accomplished by adding poly（ether sulfone） （PES） and hydrophilic fumed silica （A200） nanopartieles simultaneously. The optimum composition is found to be TDE85 ： PES ： A200= 100 ： 5 ： 0. 3. The tensile strength and elongation at break of modified epoxy are improved by 38. 1% and 29.4% at most, respectively, without significantly sacrificing their modulus and thermal properties. Scanning electron microscopy （SEM） results demonstrate that modified epoxies exhibited desirable ductile fracture behavior. The mechanism for the notable enhancement in the toughness of trifunetional epoxy is interpreted by the synergism between PES and silica nanoparticles which possess diverse toughening mechanisms.
出处
《塑料工业》
CSCD
北大核心
2017年第6期101-105,共5页
China Plastics Industry
