微波合成含氮掺杂碳量子点改性水性聚氨酯的制备与性能

以柠檬酸和尿素分别为碳源和氮源，微波法合成含氮掺杂碳点N-CDs。以异氟尔酮二异氰酸酯（IPDI）、聚氧化丙烯（PPG-2000）为主要原料，加入不同量的N-CDs制备一系列碳点水性聚氨酯复合材料 （N-CDs/WPU）。通过FTIR、TEM、XPS、UV-vis、荧光光谱和力学性能测试等对复合材料结构和性能进行表征。测试结果表明N-CDs主要由碳氮氧元素组成，表面具有胺基、羟基等活性基团，N-CDs的加入，提高了复合胶膜的力学性能，赋予了胶膜荧光性能。当N-CDs质量分数为0.6%时胶膜拉伸强度达到最大35.00MPa，加入量质量分数为0.8%时荧光强度最佳。

Preparation and properties of microwave-synthesized nitrogen-doped carbon quantum dots modified waterborne polyurethane

Using citric acid and urea as the carbon source and nitrogen source, the N-CDs containing nitrogen-doped carbon dots were synthesized by microwave method. A series of carbon-dot waterborne polyurethane composites (N-CDs/WPU) were prepared by using isoflurone diisocyanate (IPDI) and polyoxypropylene (PPG-2000) as main raw materials and adding different amounts of N-CDs. The structures and properties of composites were characterized by FTIR, TEM, XPS, UV-vis, fluorescence spectroscopy and mechanical property testing. The results showed that N-CD was mainly composed of carbonitride and oxygen, and the surface had active groups such as amine groups and hydroxyl groups. The addition of N-CDs improved the mechanical properties of the composite film, gave the film fluorescence properties. When the amount of N-CDs added was 0.6%, the tensile strength of the film reached a maximum of 35.00 MPa. when the addition amount was 0.8%, the fluorescence intensity was the best.