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首页> 外文期刊>Journal of Applied Polymer Science >Reinforcement of poly(dimethylsiloxane) networks by montmorillonite platelets
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Reinforcement of poly(dimethylsiloxane) networks by montmorillonite platelets

机译：蒙脱土薄片增强聚二甲基硅氧烷网络

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摘要

A PDMS network, synthesized from a vinyl-terminated precursor, was reinforced by plate-like montmorillonite (volclay) particles with different surface cations. The optimal ratio of crosslinker-to-PDMS precursor was ascertained from the mechanical properties of networks prepared with different crosslinker concentrations. The elastic modulus of the polymer was enhanced by the montmorillonite particles. The increase in modulus was higher in the Li- than in the Na-volclay composites. The ultimate strength of the composites was also strongly enhanced by the small platelets, especially in presence of surface Li+. The stronger influence of Li-volclay on the mechanical properties of the composites can be attributed to the partial formation of an intercalated structure, which leads to thinner particles with a high aspect ratio. Both composite strength and modulus were proportional to the filler-volume-fraction, but the increase in strength was limited by rising particle agglomeration at high loading. In contrast to organic-modified montmorillonite, the inorganic surface of volclay catalyzed the thermal degradation of PDMS. (C) 2002 John Wiley Sons, Inc. [References: 24]
机译：由乙烯基封端的前体合成的PDMS网络由具有不同表面阳离子的板状蒙脱土（volclay）颗粒增强。交联剂与PDMS前体的最佳比例由使用不同交联剂浓度制备的网络的机械性能确定。蒙脱石颗粒提高了聚合物的弹性模量。 Li-中的模量增加高于Na-volclay复合物中的模量增加。复合材料的极限强度也因小片状片而大大增强，特别是在存在表面Li +的情况下。 Li-volclay对复合材料机械性能的更强影响可以归因于插层结构的部分形成，这导致具有高长径比的较细颗粒。复合材料的强度和模量均与填料体积分数成正比，但强度的增加受到高负荷下颗粒团聚的增加的限制。与有机改性的蒙脱石相比，volclay的无机表面催化了PDMS的热降解。 （C）2002 John Wiley Sons，Inc. [参考：24]

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