单层氧化石墨烯改性水性聚氨酯

采用一种新型高效的铁系强氧化剂成功制备出单层氧化石墨烯(GO),通过衰减全反射红外光谱、X射线衍射、拉曼光谱、原子力显微镜、场发射电子显微镜表征了这种单层GO的形态和性质。通过超声将GO分散于去离子水中,于水性聚氨酯(WPU)合成的乳化阶段共混制备出GO-WPU复合材料,测试了其拉伸性能、热学性能、疏水性的变化,同时利用透射电镜和场发射电子显微镜分别对乳液粒子形态与涂膜截面形貌进行了观察。结果表明,单层GO在乳化阶段的加入所制备的复合材料的拉伸强度得到了明显的改善,由原来的10 MPa增加到24 MPa,当GO质量分数为0.30%,复合聚氨酯的初始热分解温度(T_(d5))从245℃上升到272℃,同时,随着GO用量的逐步增加,复合膜的接触角则由70.3°提高到了95.2°从而实现了疏水性的改善。

Waterborne Polyurethane Modified with Single-Layer Graphene Oxide

Single-layer grapheme oxide (GO) was successfully prepared by using a novel and efficient strong oxidant.The morphology and property of this kind of GO were investigated by FT-IR,XRD,Raman,AFM and FESEM.GO is well dispersed into deionized water and then added to the prepolymer at the stage of emulsion for synthesis of waterborne polyurethane.The performance,including mechanical property,thermal properties and hydrophobicity,of the GO-waterborne polyurethane (WPU) films were tested,the cross-sectional morphology of nanocomposites and particle morphology of emulsion were also observed by FESEM and TEM,respectively.The results indicate that tensile property of this hybrid film incorporated with the single-layer grapheme oxide at the stage of emulsion was significantly improved,with the tensile strength increasing from 10 MPa to 24 MPa.Thermal property show that adding 0.3 ％ GO enhances the initial thermal degradation (5 ％ mass loss) temperature from 245 ℃ to 272 ℃.Hydrophobicity test indicates that water contact angle (WCA) of the composites increases from 70.3°to 95.2° with increase of the GO content.