Fabrication of transparent polymer-matrix nanocomposites with enhanced mechanical properties from chemically modified ZrO2 nanoparticles
Fabrication of transparent polymer-matrix nanocomposites with enhanced mechanical properties from chemically modified ZrO2 nanoparticles
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DOI：
10.1007/s10853-011-6092-5
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发表时间：
2012-03-01
影响因子：
4.5
通讯作者：
Garnweitner, Georg
中科院分区：
文献类型：
--
作者：
Cheema, Tarik Ali;Lichtner, Alexander;Garnweitner, Georg
采用稳定的亚10 nm ZrO2纳米分散体制备了具有增强力学性能的光学透明纳米复合材料。ZrO2分散体与市售的双酚基环氧树脂（RIMR 135i）混合，在完全去除溶剂后，用两种胺基固化剂（RIMH 134和RIMH 137）的混合物固化。在室温下，采用不同的有机配体对ZrO2纳米颗粒表面进行化学修饰，得到了非水法制备的ZrO2纳米颗粒的胶体分散体。利用ATR-FT-IR和热重分析研究了配体与表面的成功结合。SAXS证实了纳米颗粒在基体中的均匀分布，并观察到ZrO2含量高达8 wt%时的高透光率。ZrO2含量仅为2 wt%的纳米复合材料的力学性能得到显著提高，拉伸强度和杨氏模量分别提高11.9%和12.5%。讨论了不同表面结合配体对材料力学性能的影响。
Optically transparent nanocomposites with enhanced mechanical properties were fabricated using stable dispersions of sub 10 nm ZrO2 nanoparticles. The ZrO2 dispersions were mixed with a commercially available bisphenol-A-based epoxy resin (RIMR 135i) and cured with a mixture of two amine-based curing agents (RIMH 134 and RIMH 137) after complete solvent removal. The colloidal dispersions of ZrO2 nanoparticles, synthesized through a non-aqueous approach, were obtained through a chemical modification of the ZrO2 nanoparticle surface, employing different organic ligands through simple mixing at room temperature. Successful binding of the ligands to the surface was studied utilizing ATR-FT-IR and thermogravimetric analysis. The homogeneous distribution of the nanoparticles within the matrix was proven by SAXS and the observed high optical transmittance for ZrO2 contents of up to 8 wt%. Nanocomposites with a ZrO2 content of only 2 wt% showed a significant enhancement of the mechanical properties, e.g., an increase of the tensile strength and Young's modulus by up to 11.9 and 12.5%, respectively. Also the effect of different surface bound ligands on the mechanical properties is discussed.