氧化石墨烯/SiO_(2)复合材料改性水性聚氨酯的制备及性能研究

Preparation of graphene oxide/SiO_(2) modified waterborne polyurethane and study on its properties

将自制杂化材料SiO_(2)-GO加入水性聚氨酯(WPUA)中,制备了SiO_(2)-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SiO_(2)表面活性基团之间存在相互作用,SiO_(2)更好地阻隔了GO的团聚,实现GO有效地剥离。随着SiO_(2)-GO填料的增加,SiO_(2)-GO/WPUA复合乳液的粒径逐渐增大。由热失重、拉伸测试可知,SiO_(2)-GO杂化填料的加入,可提高SiO_(2)-GO/WPUA的力学性能和热稳定性。当SiO_(2)-GO填料质量分数为0.7%时,复合胶膜的拉伸强度为50.14MPa。TG测试结果表明,在热分解率为30%、50%时,SiO_(2)-GO/WPUA膜比WPUA的分解温度分别提高了28、46℃。SiO_(2)-GO/WPUA胶膜耐热性优于WPUA胶膜。

SiO_(2)-GO/WPUA composite emulsion is prepared by adding self-made SiO_(2)-GO into waterborne polyurethane-acrylate emulsion(WPUA)during self-emulsification process.The structure and performance of SiO_(2)-GO/WPUA composite emulsion,and its film are studied.There is interaction between active groups of GO and SiO_(2)surface.Aggregation of GO is well obstructed by SiO_(2).With the increasing addition amount of SiO_(2)-GO,the particle size of SiO_(2)-GO/WPUA composite emulsion increases gradually.It is found from thermal gravimetric analysis(TG)and tensile testing for SiO_(2)-GO/WPUA films that both the mechanical properties and heat resistance of films can be improved by SiO_(2)-GO hybrid filler.The tensile strength of the composite film reaches 50.14 MPa when the content of SiO_(2)-GO is0.7%.TG determination results indicate that thermal decomposition temperature of SiO_(2)-GO/WPUA increases by 28℃and 46℃when the thermal weight loss is 30%and 50%,respectively.The SiO_(2)-GO/WPUA films show better heat resistance than WPUA films.