PREPARATION AND PROPERTIES OF POLYUREA/GRAPHENE OXIDE COMPOSITES

摘要

Two surface modifiers, phenyl isocyanate, and poly(ethylene glycol) (PEG800), which have different affinities to the hard and soft segments in polyurea, were used to synthesize functionalized graphene oxides (GO). After the modification, the PEG800-modified (PEG800-GO) and phenyl isocyanate-modified (i-GO) GOs were highly exfoliated and dispersed in DMF. Using the suspension of the functionalized GO,. Polyurea/GO composites were prepared using a solution-blending method.lt was shown that PEG800-GO and i-GO are uniformly dispersed throughout the polymer matrix on a nanoscale. The well-dispersed GO platelets improved the thermal stability and mechanical properties of polyurea. PEG800-GO, which has a strong affinity for the soft segments, shows a more significant reinforcing effect. At 2.0 wt% GO, the tensile strength of polyurea was enhanced by ～75%.