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Improving the toughness of epoxy with a reactive tetrablock copolymer containing maleic anhydride

机译：通过含有马来酸酐的反应性四嵌段共聚物提高环氧树脂的韧性

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Reactive block copolymers (BCPs) provide a unique means for toughening epoxy thermosets because covalent linkages provide opportunities for greater improvement in the fracture toughness (K-IC). In this study, a tailored reactive tetrablock copolymer, poly[styrene-alt-(maleic anhydride)]-block-polystyrene-block-poly(n-butyl acrylate)-block-polystyrene, was incorporated into a diglycidyl ether of bisphenol A based epoxy resin. The results demonstrate the advantage of reactive BCP in finely tuning and controlling the structure of epoxy blends, even with 95 wt % epoxy-immiscible triblocks. The size of the dispersed phase was efficiently reduced to submicrometer level. The mechanical properties, such as K-IC, of these cured blends were investigated. The addition of 10 wt % reactive BCP into the epoxy resins led to considerable improvements in the toughness, imparting nearly a 70% increase in K-IC. The designed reactive tetrablock copolymer opened good prospects because of its potential novel applications in toughening modification of engineering polymer composites. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 132, 42826.
机译：反应性嵌段共聚物（BCP）为增韧环氧热固性塑料提供了独特的方法，因为共价键为断裂韧性（K-IC）的改善提供了机会。在这项研究中，量身定制的反应性四嵌段共聚物，聚[苯乙烯-alt-（马来酸酐）]-嵌段-聚苯乙烯-嵌段-聚（丙烯酸正丁酯）-嵌段-聚苯乙烯，被掺入到双酚A基的二缩水甘油醚中环氧树脂。结果证明了反应性BCP在微调和控制环氧共混物结构方面的优势，即使使用95 wt％的环氧不混溶三嵌段共聚物也是如此。分散相的尺寸有效地减小到亚微米水平。研究了这些固化共混物的机械性能，例如K-IC。向环氧树脂中添加10 wt％的反应性BCP可以大大提高韧性，从而使K-IC值提高近70％。设计的反应性四嵌段共聚物因其在工程聚合物复合材料的增韧改性中的潜在新应用而打开了良好的前景。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，132，42826。

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