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Synthesis of polyether-based polyurethane-silica nanocomposites with high elongation property

机译:高伸长率聚醚基聚氨酯-二氧化硅纳米复合材料的合成

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摘要

The NCO-terminated prepolymers, prepared by reacting a mixture of poly(tetramethylene glycol) and fumed nanosilica with 4,4'-diphenylmethane diisocyanate, were chain-extended with 1,4-butanediol to yield polyurethane-silica nanocomposites. The nanosilica particles were well dispersed in the polyurethane matrix up to 3wt%. The polyurethane chains in the interfaces were covalently linked to the nanosilica surfaces through urethane bonds. Introduction of the nanosilica into the polyurethane enhanced both tensile strength and elongation of the resulting nanocompo-site films. Especially, the elongation at break of the nanocomposite films containing lwt% nanosilica was 3.5 times greater than that of the pure polyurethane films.
机译:通过使聚四亚甲基二醇和气相纳米二氧化硅的混合物与4,4'-二苯基甲烷二异氰酸酯反应制得的NCO端基预聚物与1,4-丁二醇进行链增长反应,以制得聚氨酯-二氧化硅纳米复合材料。纳米二氧化硅颗粒良好地分散在聚氨酯基质中,至多3wt%。界面中的聚氨酯链通过氨基甲酸酯键共价连接至纳米二氧化硅表面。将纳米二氧化硅引入聚氨酯提高了所得纳米复合位薄膜的拉伸强度和伸长率。特别地,包含1wt%的纳米二氧化硅的纳米复合膜的断裂伸长率是纯聚氨酯膜的断裂伸长率的3.5倍。

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