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Melt compounding with graphene to develop functional, high-performance elastomers

机译：与石墨烯熔融共混以开发功能性高性能弹性体

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摘要

Rather than using graphene oxide, which is limited by a high defect concentration and cost due to oxidation and reduction, we adopted cost-effective, 3.56 nm thick graphene platelets (GnPs) of high structural integrity to melt compound with an elastomer - ethylene-propylene-diene monomer rubber (EPDM) - using an industrial facility. An elastomer is an amorphous, chemically crosslinked polymer generally having rather low modulus and fracture strength but high fracture strain in comparison with other materials; and upon removal of loading, it is able to return to its original geometry, immediately and completely. It was found that most GnPs dispersed uniformly in the elastomer matrix, although some did form clusters. A percolation threshold of electrical conductivity at 18 vol% GnPs was observed and the elastomer thermal conductivity increased by 417% at 45 vol% GnPs. The modulus and tensile strength increased by 710% and 404% at 26.7 vol% GnPs, respectively. The modulus improvement agrees well with the Guth and Halpin-Tsai models. The reinforcing effect of GnPs was compared with silicate layers and carbon nanotube. Our simple fabrication would prolong the service life of elastomeric products used in dynamic loading, thus reducing thermosetting waste in the environment.
机译：与其使用氧化石墨烯（由于缺陷浓度高以及由于氧化和还原所致的成本）所限制，我们采用具有成本效益的，具有高结构完整性的3.56 nm厚的石墨烯薄片（GnPs）将化合物与弹性体-乙烯-丙烯熔融-二烯单体橡胶（EPDM）-使用工业设备。弹性体是一种无定形的化学交联聚合物，与其他材料相比，通常具有较低的模量和断裂强度，但断裂应变较高。卸下负载后，它可以立即完全恢复到其原始几何形状。发现大多数GnPs均匀分散在弹性体基质中，尽管有些确实形成簇。观察到在18 vol％GnPs时电导率的渗漏阈值，并且在45 vol％GnPs时弹性体的热导率增加了417％。在26.7 vol％的GnPs下，模量和拉伸强度分别提高了710％和404％。模量改进与Guth和Halpin-Tsai模型非常吻合。将GnPs的增强作用与硅酸盐层和碳纳米管进行了比较。我们的简单制造方法可以延长用于动态加载的弹性体产品的使用寿命，从而减少环境中的热固性浪费。

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