Effects of Amino-Functionalized Graphene Oxide on the Mechanical and Thermal Properties of Polyoxymethylene

Polyoxymethylene (POM)/graphene oxide (GO) composites are fabricated using a melt blending method. GO is modified, respectively, by 3-aminopropyltriethoxysilane (KH550-GO) and polyethylenimine (PEI-GO) to enable its uniform distribution in the POM matrix. The mechanical properties of the POM/GO composites are dramatically improved compared to those of pure POM even at a very low loading of GO. The tensile strength and Young's modulus as well as storage and loss moduli increase by 17.1%, 45.4%, 97.3%, and 94.7%, respectively. The thermal stability of the composites is also greatly promoted. Fourier transform infrared and X-ray photoelectron spectra reveal that the enhanced properties are mainly stemmed from the notable interfacial interactions between the NH groups in GO sheets and POM chains.