Preparation and properties of silanized functionalized graphene/polyurethane composites

Abstract

Graphene oxide (GO) was prepared from a modified method of Hummers, then the GO was modified by γ-glycidoxypropyltrimethoxysilane (KH560) and reduced by hydrazine hydrate. The silylated reduced graphene oxide (KRGO) was obtained. The KRGO/polyurethane (PU) composites were prepared by solution mixing method using the KRGO as the filler and PU solution as the matrix. The KRGO and KRGO/PU composites were systematically characterized. The structure and morphology characterization showed that the KRGO was uniformly dispersed in PU solution by covalent bonding. The interlayer distance of the graphene increased from 0.79 to 0.95 nm after modification. The KRGO could provide a good compatibility with the PU. The thermal stabilities of the KRGO/PU composites are increased with the increasing addition of KRGO. At the KRGO content value of 1 wt.%, the thermal decomposition temperature on 10% weight loss was approximately 47 °C higher than that of the pure PU.

Keywords:

• Graphene oxide
• polyurethane
• KH560
• composites
• thermal stability

Additional information

Funding

This work was financially supported by prospective joint research program of Industry-university-research of Jiangsu (No.BY2016030-21) and Postgraduate Research & Practice Innovation Program of Jiangsu Province (SJCX18_0990).