Rubber/graphene nanocomposites as gas barrier materials have attracted great interest in recent years. However, it is still a challenge to construct strong covalent interfaces between nonpolar rubber matrix and graphene for retaining excellent gas barrier and mechanical properties of aircraft tires after fatigue. In this work, hybrid cross-linked networks in brominated butyl rubber (BIIR) are first proposed and in-situ constructed successfully via introducing the amphiphilic graphene oxide cross-linkers (R-aGO). R-aGO can participate in the curing of BIIR to form hybrid cross-linked networks, which can force R-aGO to move with BIIR synchronously during fatigue deformation due to strong interfaces between BIIR and R-aGO via covalent bonds. When R-aGO content is 3 phr, the BIIR/R-aGO nanocomposites show a 27 % improvement in gas barrier property, a 230 % increase in strength at 40 % strain (suffered deformation of aircraft tires), and a 229 % enhancement in tensile strength relative to conventional BIIR/aGO nanocomposites with interfacial modifiers. More importantly, BIIR/R-aGO nanocomposites still retain excellent gas barrier and mechanical properties even after 500,000 load cycles (40 % strain). This work provides a novel route to fabricate rubber/graphene nanocomposites with superior gas barrier and mechanical properties, especially after fatigue.

中文翻译：

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通过两亲性氧化石墨烯交联剂在溴化丁基橡胶中原位构建混合交联网络：在疲劳后保持优异的气体阻隔性和机械性能


近年来，橡胶/石墨烯纳米复合材料作为阻气材料引起了人们的极大兴趣。然而，在非极性橡胶基体和石墨烯之间构建强共价界面以保持飞机轮胎在疲劳后优异的阻气性和机械性能仍然是一个挑战。在这项工作中，首次提出了溴化丁基橡胶（BIIR）中的混合交联网络，并通过引入两亲性氧化石墨烯交联剂（R-aGO）成功原位构建。 R-aGO可以参与BIIR的固化形成混合交联网络，由于BIIR和R-aGO之间通过共价键形成强界面，因此可以迫使R-aGO在疲劳变形过程中与BIIR同步移动。当R-aGO含量为3份时，BIIR/R-aGO纳米复合材料的阻气性提高了27%，40%应变（飞机轮胎变形）下的强度提高了230%，耐腐蚀性能提高了229%。相对于具有界面改性剂的传统 BIIR/aGO 纳米复合材料的拉伸强度。更重要的是，即使在 500,000 次负载循环（40% 应变）后，BIIR/R-aGO 纳米复合材料仍然保持优异的气体阻隔和机械性能。这项工作提供了一种制造具有优异气体阻隔和机械性能（尤其是在疲劳后）的橡胶/石墨烯纳米复合材料的新途径。