碳点/水性聚氨酯复合材料的制备及性能

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,以此为碳源,采用水热法制备碳点,再以IPDI和聚己二酸-1,4-丁二醇酯二醇(PBA)为原料,将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。采用FTIR、TEM、SEM、TGA、DSC、UV-Vis、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检测和表征。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,当碳点加入质量分数达0.5%时,复合胶膜的量子产率和荧光寿命分别为4.15%和2.43 ns,胶膜的拉伸强度和断裂伸长率分别为36.80 MPa和660%,比未加碳点的样品分别提高了29.7%和33.3%。

Preparation and Properties of Carbon Dots/Waterborne Polyurethane Composites

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.