将自制杂化材料SiO₂-GO加入水性聚氨酯（WPUA）中，制备了SiO₂-GO/WPUA复合乳液，研究了该复合乳液及其胶膜的结构及性能。改性后GO与SiO₂表面活性基团之间存在相互作用，SiO₂更好地阻隔了GO的团聚，实现GO有效地剥离。随着SiO₂-GO填料的增加，SiO₂-GO/WPUA复合乳液的粒径逐渐增大。由热失重、拉伸测试可知，SiO₂-GO杂化填料的加入，可提高SiO₂-GO/WPUA的力学性能和热稳定性。当SiO₂-GO填料质量分数为0.7%时，复合胶膜的拉伸强度为50.14 MPa。TG测试结果表明，在热分解率为30%、50%时，SiO₂-GO/WPUA膜比WPUA的分解温度分别提高了28、46℃。SiO₂-GO/WPUA胶膜耐热性优于WPUA胶膜。

SiO₂-GO/WPUA composite emulsion is prepared by adding self-made SiO₂-GO into waterborne polyurethane-acrylate emulsion (WPUA) during self-emulsification process.The structure and performance of SiO₂-GO/WPUA composite emulsion,and its film are studied.There is interaction between active groups of GO and SiO₂ surface.Aggregation of GO is well obstructed by SiO₂.With the increasing addition amount of SiO₂-GO,the particle size of SiO₂-GO/WPUA composite emulsion increases gradually.It is found from thermal gravimetric analysis (TG) and tensile testing for SiO₂-GO/WPUA films that both the mechanical properties and heat resistance of films can be improved by SiO₂-GO hybrid filler.The tensile strength of the composite film reaches 50.14 MPa when the content of SiO₂-GO is 0.7%.TG determination results indicate that thermal decomposition temperature of SiO₂-GO/WPUA increases by 28℃ and 46℃ when the thermal weight loss is 30% and 50%,respectively.The SiO₂-GO/WPUA films show better heat resistance than WPUA films.

马懿卿(1966-),男,本科,高级工程师,研究方向为功能高分子材料,xymyt@126.com