It is still a huge challenge to add a kind of filler into rubber toward strong yet tough elastomer. In this work, a biomimetic design for polyurethane rubber (PUR) by introducing hydrogen bond sacrificial units at the rubber‐graphene oxide interfaces was described. Poly(vinyl alcohol)‐g‐graphene oxide (PGO) reinforced PUR composites were prepared by mechanical blending. The grafting rate of poly(vinyl alcohol) (PVA) on graphene oxide (GO) surface was 23.5%. The improved properties, including the tensile strength, elongation at break and thermal stability of the PUR/PGO composites compared to the virgin PUR vulcanizate were attributed to the hydrogen bonds between PUR and PGO. An 131.2% increase in the tensile strength, a 60.2% increase in the elongation at break and a 23.5°C increase in the maximum decomposition temperature were obtained by adding 1 phr PGO. In addition, the low temperature resistance of the PUR vulcanizate was improved with the addition of PGO. The mechanism of improved properties was attributed to the destruction and reconstitution of hydrogen bond sacrificial units in the PUR/PGO system.

中文翻译：

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通过在橡胶-石墨烯界面引入氢键牺牲单元来增强聚氨酯橡胶的强度和韧性

在橡胶中添加一种既坚固又坚韧的弹性体仍然是一个巨大的挑战。在这项工作中，描述了通过在橡胶-氧化石墨烯的界面处引入氢键牺牲单元，对聚氨酯橡胶（PUR）进行仿生设计。通过机械混合制备聚乙烯醇-g-氧化石墨烯（PGO）增强的PUR复合材料。聚乙烯醇（PVA）在氧化石墨烯（GO）表面的接枝率为23.5％。与原始的PUR硫化橡胶相比，PUR / PGO复合材料的抗张强度，断裂伸长率和热稳定性得到了改善，这归因于PUR和PGO之间的氢键。拉伸强度提高131.2％，断裂伸长率提高60.2％，拉伸强度提高23。通过添加1 phr PGO，最高分解温度提高了5°C。另外，通过添加PGO提高了PUR硫化橡胶的耐低温性。性能改善的机制归因于PUR / PGO系统中氢键牺牲单元的破坏和重构。