具有热可逆性的自修复石墨烯量子点/聚氨酯透明复合膜研究

Study on self-healing NH_(2)-GQDs/PU-DA with thermal reversibility

采用一步法制备具有热可逆性的透明自修复聚氨酯薄膜(PU-DA)。通过物理结合方式加入氨基修饰的石墨烯量子点(NH_(2)-GQDs),最终制备出具有热可逆性的自修复石墨烯量子点/聚氨酯透明复合膜(NH_(2)-GQDs/PU-DA)。采用傅里叶红外光谱仪、偏光显微镜和万能拉力机等手段进行结构和性能的分析。结果表明:通过热可逆反应(Diels-Alder)键的引入,可使聚氨酯薄膜在一定温度下具有自修复性能的同时,仍保持较好的柔韧性,拉伸强度和断裂伸长率最优分别达到1.437MPa和117.4%。通过应力-应变测试发现,NH_(2)-GQDs的加入在一定程度上增强了聚氨酯薄膜的力学性能,并改善了聚氨酯薄膜的疏水性。

In order to study the preparation and properties of self-healing graphene quantum dots/polyurethane transparent composite film,a one-step method was used to prepare transparent polyurethane film(PU-DA)with thermal reversibility.The amino-modified graphene quantum dots(NH_(2)-GQDs)were added through physical blenging,and the transparent self-healing graphene quantum dot/polyurethane composite film(NH_(2)-GQDs/PU-DA)with fluorescence was finally prepared.Fourier infrared spectrometer(FT-IR),polarizing microscope and universal tension machine were used to analyze the structure and performance.The results showed that,with the introduction of DielsAlder bond,the polyurethane films had self-healing properties at a certain temperature and still maintained good flexibility,and the optimal tensile strength and elongation at break reached 1.437 MPa and 117.4%,respectively.The stress-strain test results showed that the addition of NH_(2)-GQDs improved the mechanical properties of the polyurethane film to a certain extent,and increased the hydrophobicity of the polyurethane film.