Preparation and properties of amine-functionalized reduced graphene oxide/waterborne polyurethane nanocomposites

Abstract

Amine-functionalized reduced graphene oxide (NH 2 -RGO), with primary amine (-NH 2 ) groups linked onto surfaces by toluene-2,4-diisocynate), was successfully synthesized. Subsequently, the as-prepared NH 2 -RGO nanoplatelets were covalently incorporated into a waterborne polyurethane (WPU) matrix to fabricate NH 2 -RGO/WPU nanocomposites by the reaction of -NH 2 groups with the isocyanate-terminated polyurethane prepolymer. Electron microscopic observations confirmed that the NH 2 -RGO nanoplatelets were homogenously dispersed in the WPU matrix. The NH 2 -RGO/ WPU nanocomposites exhibited a significant improvement in their mechanical and thermal properties. The tensile strength and storage modulus of the nanocomposites increased by 73% and 973%, respectively, with the addition of 1.0 wt% NH 2 -RGO. The thermal degradation temperature was enhanced by about 40 C compared with the neat WPU. Meanwhile, the thermal conductivity increased by about 258%.

Determination of amino groups on functionalized graphene oxide for polyurethane nanomaterials: XPS quantitation vs. functional speciation

“…25 The amino-functionalized GO was identied as a promising polymer ller, as its primary amino groups readily react with polyisocyanates. [26][27][28] Knowledges about the presence of the NH 2 groups on the GO surface and about their accessibility for the reaction with isocyanates are fundamental to preserve the correct stoichiometry during the course of polymerization, ensuring a high polymerization degree of the nal nanocomposites.…”

Physicochemical characteristics of bio‐based thermoplastic polyurethane/graphene nanocomposite for piezoresistive strain sensor

“…The enhancement in the stability is ascribed to the synergistic effect of graphene, phase separation, and crystallization of soft segment. [ 35–37 ] Char formation increased upon the increase in the graphene loading and the highest char was observed for TPU‐2.0G. TPU‐0G did not show any char formation, while 0.25–1.9% of char was observed in the nanocomposites.…”

Study on microphase separation of novel crosslinked polyurethane by AFM and DMA

“…The structure and micromorphology of polymer can be analyzed from nanoscale by Atomic force microscope (AFM), [16][17][18][19][20][21] therefore it is intuitive in research of microphase separation by AFM. In this paper, PU composites and pure PU were scanned in the region of 300nm~2μm by AFM.…”

“…L. Rueda et al 16 analyzed the biodegradability of polyurethane from the viewpoint of microdomains structure by DSC and ATR-IR. S. L. Wu et al 17 investigated the effects of aminefunctionalized reduced graphene oxide (NH 2 -RGO) on the microphase structure and mechanical and thermal properties of NH 2 -RGO/WPU nanocomposites.…”