Abstract

Based on the self-polymerization-adhesion behavior of dopamine, multilayer graphene (MLG) was biomimetically modified by polydopamine (PDA), which significantly improved the dispersibility and compatibility of the MLG. A flame-retardant composite elastomer was formed by adding the MLG-PDA and an intumescent flame retardant (IFR) into an ethylene-vinyl acetate elastomer (EVM). This not only improved the flame-retardant properties, but also promoted the compatibility between the interfaces, thereby compensating for the damage caused by IFR to the mechanical properties of the composite elastomer. Compared with EVM/IFR (70/30), the tensile strength (12.3 MPa) and limited oxygen index (28.5) of the EVM/MLG-PDA/IFR (70/27/3) composite elastomer were increased by 33.7% and 10%, respectively. Cone calorimeter test results showed a synergistic flame-retardant effect between the MLG-PDA and IFR, which promoted the formation of a denser carbon layer. Therefore, the MLG modified by PDA can be added to flame-retardant polymers as an effective synergist of intumescent flame retardant systems.

摘要

基于多巴胺的自聚合粘附行为，聚多巴胺（PDA）对多层石墨烯（MLG）进行了仿生改性，显着提高了MLG的分散性和相容性。通过将MLG-PDA和膨胀型阻燃剂（IFR）加入乙烯-醋酸乙烯酯弹性体（EVM）中形成阻燃复合弹性体。这不仅提高了阻燃性能，而且促进了界面之间的相容性，从而补偿了IFR对复合弹性体力学性能的损害。与EVM/IFR（70/30）相比，EVM/MLG-PDA/IFR（70/27/3）复合弹性体的拉伸强度（12.3 MPa）和极限氧指数（28.5）分别提高了33.7%和10 ％， 分别。锥形量热仪测试结果表明 MLG-PDA 和 IFR 之间具有协同阻燃作用，促进了更致密的碳层的形成。因此，PDA改性的MLG可以作为膨胀型阻燃体系的有效增效剂加入到阻燃聚合物中。