Abstract:Graphene oxide(GO) was firstly synthesized, and modified with ethylenediamine and butyl acrylate step by step. Then the obtained MGO which has introduced vinyl groups reacted with acrylate monomers (including hydroxy) by polymerization to prepare MGO/PA containing hydroxy groups; meanwhile, the hyperbranched polyurethane(HBPU) prepared was used as core, of which periphery grafted with linear polyurethane, which contained cyanate groups, and the MGO/PA was finally added into the system, via polycondensation and crosslinking, under the action of homogeneous emulsification, finally the waterborne hyperbranched polyurethane containing poly(ethylenediamined GO/acrylate) hybrid latexes were acquired. The FT-IR, XRD, TEM, AFM, FE-SEM, TG and so on were used to characterize the composites, and the effects on the stability, hydrophobicity, thermal performance and mechanical property of hybrid latexes with different content of MGO were investigated. The results demonstrate that GO is successfully ethylenediamined, exfoliated relatively completely and uniformly dispersed. When the content of MGO is increasing, the water contact angle, tensile strength and water absorption of the composite films will rise at first and go down at last, and during this process the addition of PA is fixed (about 16% relative to HBPU).The introduction of MGO is about 0.46%, revealing a commendable compatibility with HBPU matrix, and comprehensive performance of the composites reaches the best: the thermal decomposition temperature of composite films increases by 29 ℃, the 24 h water absorption of films respectively reaches to 5.21% and the water contact angle of film surface is 99.7°, meanwhile the tensile strength and elongation of composites respectively are 15.37 MPa and 445.3%, respectively.