A graphene oxide (GO) was prepared by the modified Hummers method.Then an aminated reduced graphene oxide (KRGO) was obtained by GO modified with silane coupling agent (APTMS) followed by reduction with L-ascorbic acid (L-AA). The prepared KRGO was mixed with carbon nanotubes (CNT) as synergistic modifier, and then was combined with waterborne polyurethane (WPU) to get KRGO- CNT/WPU composites, by which the mechanical properties, poor thermal stability and water resistance, etc. of WPU were improved. The structure and properties of the composites were characterized by FT-IR,TEM,SEM,XRD and TG. The results showed that APTMS successfully interlaid the GO sheet and significantly improved the mechanical properties, hydrophobic and thermal properies of the composites. When the mass ratio of KRGO-CNT was 0.5%, the tensile strength of KRGO-CNT/WPU composites increased from 14.10 MPa to 35.49 MPa, showing 152% higher than that of pure WPU. In addtion, the temperature of KRGO-CNT/WPU at the thermal weight loss of 5% was 29.3 ℃ higher than that of the pure WPU. When the mass ratio of KRGO-CNT was 0.8%, the static water contact angle increased from 54.7° to 82.8°.
CHENG Xi-HuiTaoZi
. Preparation and Properties of Aminated Reduction Graphene Oxide-Carbon Nanotubes/Waterborne Polyurethane Composites[J]. Paint & Coatings Industry, 2019
, 49(3)
: 8
-13
.
DOI: 10.12020/j.issn.0253-4312.2019.3.8
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