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首页> 外文期刊>RSC Advances >Simultaneously enhanced mechanical properties and flame retardancy of UHMWPE with polydopamine-coated expandable graphite
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Simultaneously enhanced mechanical properties and flame retardancy of UHMWPE with polydopamine-coated expandable graphite

机译：聚多巴胺涂层可膨胀石墨同时提高UHMWPE的机械性能和阻燃性

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The potential prospect of expandable graphite (EG) in the development of polymer composites is severely limited by required large additions and poor interface compatibility with the polymer. Inspired by mussels, polydopamine (PDA) can be used as an effective interface modifier for EG to prepare ultra high molecular weight polyethylene (UHMWPE) composites with superior mechanical properties and high flame retardancy. The surface of expandable graphite (EG) was coated with a thin adhesive PDA film through self-polymerization of dopamine. The modified expandable graphite (EG@PDA) was combined with APP to prepare UHMWPE flame retardant composites. Compared with UHMWPE/APP/EG (with 20 wt% APP/EG), UHMWPE/APP/EG@PDA (with 20 wt% APP/EG@PDA) gives a decrement by 16.7% in limiting oxygen index, 29.7% in the peak of the heat release rate, 20.4% in total heat release and 49.3% in total smoke release, with an increment by 37% in tensile strength and 67.9% in elongation at break, respectively. It is suggested that the presence of PDA as an interface modifier can greatly improve the interfacial compatibility between EG and UHMWPE. Moreover, it can lead to forming more char residue and reducing the release of smoke particulates during combustion of the composites.
机译：可膨胀石墨（EG）在聚合物复合材料开发中的潜在前景受到要求的大量添加和与聚合物的不良界面相容性的严重限制。受到贻贝的启发，聚多巴胺（PDA）可以用作EG的有效界面改性剂，以制备具有优异机械性能和高阻燃性的超高分子量聚乙烯（UHMWPE）复合材料。可膨胀石墨（EG）的表面通过多巴胺的自聚合作用涂有一层薄的PDA粘合膜。将改性的可膨胀石墨（EG @ PDA）与APP结合制备UHMWPE阻燃复合材料。与UHMWPE / APP / EG（APP / EG含量为20％）相比，UHMWPE / APP / EG @ PDA（APP / EG @ PDA含量为20 wt％）极限氧指数降低了16.7％，而极限氧指数降低了29.7％。放热率的峰值，总放热的20.4％和总烟气的释放的49.3％，其抗张强度和断裂伸长率分别增加了37％和67.9％。建议使用PDA作为界面改性剂可以大大改善EG和UHMWPE之间的界面相容性。而且，它可以导致形成更多的炭渣并减少复合材料燃烧过程中烟尘的释放。

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