【作者】 孙国恩； 张莉； 张春玲； 张万喜；

【Author】 SUN Guo-en, ZHANG Li, ZHANG Chun-ling, ZHANG Wan-xi (Key Laboratory of Automobile materials, Ministry of Education, College of Material Science and Engineering, Jilin University, Changchun 130025, China)

【机构】 吉林大学汽车材料教育部重点实验室材料科学与工程学院；

【摘要】 采用一步熔融共混法制备出乙烯-醋酸乙烯酯共聚物(EVA)／Al2O3纳米复合材料,以场发射扫描电镜 (FESEM)、红外吸收光谱(FTIK)及扫描电镜(SEM)等测试手段表征了纳米Al2O3微粒在EVA基体中的分散性及结构,并研究了复合材料的力学性能及流变性能。结果表明,纳米Al2O3以20nm左右的粒径分散于EVA 基体之中,并在乙烯基三乙氧基硅烷的作用下与EVA 形成化学键合结构,拉伸断裂时由脆性转变为韧性。当纳米Al2O3填充量为1．5％时,拉伸强度与断裂伸长率分别提高25．4％与12．1％,并以该含量处为转折点先提高后降低。本实验中制备的纳米复合熔体表现出特殊的流变性能,其表观粘度低于纯EVA。更多还原

【Abstract】 Ethylene-vinyl acetate copolymer (EVA) is widely used as a zero-halogen material in the cable industry. And nano-alumina(Al2O3) is one of the multifunctional inorganic nanoparticles. EVA/Al2O3 nanocomposites were prepared successfully by ’one-pot’ technique. Nanocomposites based on EVA and nano-Al2O3 were prepared using melt mixing of the two components and vinyltriethoxysilane. The vinyltriethoxysilane is the surface modify agent of inorganic particles and also crosslinking agent of polyethylene. And it exhibits a good application performance in the cable industry. The dispersibility and structure of nano-Al2O3 in EVA matrix was characterized by field emission scanning electron microscope (FESEM), fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The mechanical and Theological properties of EVA/Al2O3 nanocomposite material were studied. It was found that the vinyltriethoxysilane has great influence on the affinity between the nano-Al2O3 and EVA resin. The Al2O3 particles with pore size of about 20nm dispersed in EVA matrix, and was linked with EVA through chemical bond. The introduction of nano-Al2O3 into polymers could improve the mechanical properties and Theological behaviour. When the quantity of Al2O3 was 1.5%, the tensile strength and elongation at break of EVA/Al2O3 nano-composite material were improved by 25.4% and 12.1%, respectively, and in which they firstly increased and subsequently reduced and were transformed from brittleness to toughness when ruptured. The composites showed an unusual rheological behavior. The apparent viscosity of nanocomposite melt was lower than the pure EVA, its melting point was changed a little. And the process flowability of composites were notably raised.更多还原