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利用偶联剂KH-550和超支化聚(胺-酯)(HBP)对纳米TiO2进行改性,并制备了纳米TiO2/环氧树脂(EP)复合材料。对复合材料的结构、力学性能、加工性能以及热性能进行了研究。研究结果表明,HBP接枝改性纳米TiO2(TiO2-g-HBP)的引入可明显提高复合材料的力学性能、热性能及加工性能;当w(TiO2-g-HBP)=1%时,复合材料的力学性能最好,其冲击强度和弯曲强度比纯EP分别提高了135.51%和22.98%;扫描电镜(SEM)结果显示,TiO2-g-HBP/EP复合材料由脆性断裂转变为韧性断裂。
The nano-TiO2 was modified by coupling agent KH-550 and hyperbranched poly (amine-ester) (HBP), and the nano-TiO2 / EP composite was prepared. The structure, mechanical properties, processing properties and thermal properties of the composites were studied. The results show that the mechanical properties, thermal properties and processing properties of the composites can be obviously improved by the introduction of TiO2-g-HBP grafted with HBP. When w (TiO2-g-HBP) = 1% The mechanical properties of the composites were the best. The impact strength and flexural strength of the composites increased by 135.51% and 22.98%, respectively, compared with the pure EP. The SEM results showed that the brittle fracture transformed the TiO2-g-HBP / EP composites into ductile fracture.