【摘要】 采用DMA对LLDPE/纳米SiO2复合材料的动态力学性能进行了研究。结果表明,未表面处理纳米SiO2的填充体系,随着纳米SiO2填充量的增加,α松弛转变峰向低温方向移动,贮能模量E′及损耗模量E″增加;纳米SiO2经硅烷偶联剂表面处理后,与未表面处理体系相比,体系的贮能模量E′在低温区略有降低,但在室温以上温区提高,且α松弛峰进一步向低温偏移;加入大分子相容剂后,体系的贮能模量E′在-50℃～110℃温区显著提高,α松弛峰较硅烷表面处理体系向低温偏移;含有不饱和键的硅烷偶联剂处理纳米SiO2复合体系的贮能模量E′和损耗模量E″均高于普通硅烷表面处理体系。界面作用的强弱对复合材料的动态力学性能有着重要的影响。更多还原

【Abstract】 The dynamic mechanical properties of LLDPE/nano-SiO₂ composites have been investigated by means of DMTA. The results show that with the increasing of untreated nano-SiO₂ content, the storage modulus E′ and loss modulus E″ of LLDPE/nano-SiO₂ composites increase and the α transition peaks of the composites shift to lower temperature. The storage modulus E′ of LLDPE composites filled with aminetriethoxysilane-treated SiO₂ is lower than the corresponding value for LLDPE/untreated-SiO₂ composites at lower temperatures and this trend is reversed as the temperature increased to room temperature. The introduction of macromolecular compatibilizer into the silane treated system leads to the shifting of α transition peak of the composites to lower temperature and the obvious modulus enhancement at -50 ℃¹10 ℃. When SiO₂ is treated with vinyltrimethoxysilane, E′ and E″ of the resulting composites are both higher than the corresponding values for LLDPE composites filled with aminetriethoxysilane treated SiO₂.更多还原