Highly Conductive Poly(methyl methacrylate) (PMMA)-Reduced Graphene Oxide Composite Prepared by Self-Assembly of PMMA Latex and Graphene Oxide through Electrostatic Interaction
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- 作者：Viet Hung Pham ; Thanh Truong Dang ; Seung Hyun Hur ; Eui Jung Kim ; Jin Suk Chung
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2012
- 出版时间：May 23, 2012
- 年：2012
- 卷：4
- 期：5
- 页码：2630-2636
- 全文大小：474K
- 年卷期：v.4,no.5(May 23, 2012)
- ISSN：1944-8252
文摘
We report a simple, environmentally friendly approach for preparing highly conductive poly(methyl methacrylate)鈥搑educed graphene oxide (PMMA-RGO) composites by self-assembly of positively charged PMMA latex particles and negatively charged graphene oxide sheets through electrostatic interactions, followed by hydrazine reduction. The PMMA latex was prepared by surfactant-free emulsion polymerization using a cationic free radical initiator, which created the positive charges on the surface of the PMMA particle. By mixing PMMA latex with a graphene oxide dispersion, positively charged PMMA particles easily assembled with negatively charged graphene oxide sheets through electrostatic interaction. The obtained PMMA-RGO exhibited excellent electrical properties with a percolation threshold as low as 0.16 vol % and an electrical conductivity of 64 S/m at only 2.7 vol %. Moreover, the thermomechanical properties of PMMA-RGO were also significantly improved. The storage modulus of PMMA-RGO increased by about 30% at 4.0 wt % RGO at room temperature while the glass transition temperature of PMMA-RGO increased 15 掳C at only 0.5 wt % RGO.