碳点/水性聚氨酯复合材料的制备及性能

Preparation and Properties of Carbon Dots/Waterborne Polyurethane Composites

摘要:

以异氟尔酮二异氰酸酯（IPDI）和聚氧化丙烯二醇（PPG）为原料制备水性聚氨酯(WPU)，以此为碳源采用水热法制备碳点(CDs)，以异佛尔酮二异氰酸酯（IPDI）和聚己二酸1,4-丁二醇酯二醇（PBA）原料，不同质量分数的碳点加入反应体系中制得碳点/水性聚氨酯复合材料。傅里叶变换红外光谱(FT-IR)、热重分析（TGA）、差示扫描量热(DSC)、紫外-可见吸收光谱(UV)、荧光光谱以及力学性能测试等对复合材料结构和性能进行表征。结果显示，复合胶膜的热稳定性、荧光性能、力学强度都因碳点的加入得到提高，当碳点加入量达0.5%时，复合胶膜的量子产量和荧光寿命分别为4.15%和2.43 ns，胶膜的拉伸强度和断裂伸长率为36.80 MPa和660%，比未加碳点分别提高了29.7%和33.3%。

Abstract:

Synthesized from isophorone diisocyanate (IPDI) and polyoxypropylene diol (PPG), Waterborne polyurethane (WPU) was prepared as a carbon source in the preparation of carbon dots (CDs) with hydrothermal method. Carbon dots (CDs) with different mass fractions were added to the reaction system of isophorone diisocyanate (IPDI) and polyadipate 1,4-butanediol diol (PBA) to prepare carbon dots/waterborne polyurethane composite materials. The structure and properties of the composite materials were characterized by fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), ultraviolet-visible absorption spectroscopy (UV), fluorescence spectroscopy and the mechanical properties tests. The results showed that the thermal stability, fluorescence performance and mechanical strength of the composite films were improved with the addition of carbon dots.When the mass fraction of carbon dots was 0.5%, the quantum yield and fluorescence lifetime of the composite film were 4.15% and 2.43 ns, respectively. The tensile strength and elongation at break of the films were 36.80MPa and 660%, respectively, which were 29.7% and 33.3% higher than those with no carbon dots added.