硅烷偶联剂改性氧化石墨烯/水性聚氨酯复合物的合成与性能

Preparation and Performance Study of Reduced Silanized-graphene-oxide/Waterborne Polyurethane Composites

摘要:

采用改进的Hummers方法制得氧化石墨烯（GO），利用硅烷偶联剂改性得到还原氧化石墨烯（KRGO），再与水性聚氨酯（WPU）复合得到KRGO/WPU复合物。利用红外光谱分析（FTIR）、X-射线衍射（XRD）、扫描电镜（SEM）和透射电镜（TEM）等手段进行表征，电子万用试验机、热失重分析仪等进行性能测试。结果表明：KRGO/WPU复合物热稳定性较纯WPU明显提高，且提高效果随着KRGO含量的增加而减小；当KRGO的质量分数为0.5wt%时，复合材料的拉伸强度达到最大值20.2MPa，比纯WPU提高了187.1%；另外，KRGO/WPU复合材料的导电性和疏水性能较纯WPU也有了明显改善。

Abstract:

Graphene oxide (GO) was firstly prepared from modified Hummers method, then silanized GO is reduced in situ emulsion using aqueous ammonia to achieve reduced graphene oxide/waterborne polyurethane (KRGO/WPU) nanocomposites.The effect of KRGO content on the fracture morphologies, mechanical performance, thermal stability and water-retardant properties of KRGO/WPU composites was investigated by FT-IR,XRD,TEM, SEM, universal testing machine, TG etc. The results showed that the thermal stability of KRGO/WPU is obviously higher than pure WPU, and the effect of thermal stability decreases with the increase content of KRGO. When the KRGO is up to 1.0wt%, the tensile strength of the composite reached its maxmum 20.2 MPa, 187.1% higher than that of pure WPU.However, the effects were less pronounced at high content (2.0wt%) due to the agglomeration of KRGO particles.In addition, the stability and water-retardant property of KRGO/WPU composites is obviously improved compared with pure WPU.