采用异佛尔酮二异氰酸酯制备松香基荧光聚氨酯乳液(FPU),丙烯酸松香和甲基丙烯酸缩水甘油酯,1,5-二羟基萘(1,5-DN),以1,4-丁二醇为原料。然后,以FPU为主要原料,采用悬浮聚合法成功制备了松香基荧光聚氨酯微球,偶氮二异丁腈作为引发剂,和明胶作为分散剂。通过傅里叶变换红外光谱对FPUM进行了表征,热重分析,光学显微镜,扫描电子显微镜和荧光光谱,并研究了FPUMs对pH的响应性能。结果表明,成功制备了FPUMs。随着1,5-DN水平的增加,FPUM的粒径逐渐增加,荧光强度先增大后减小。当1,5-DN的水平为3重量%时。%,平均粒径为49.3μm,颗粒分布指数(PDI)为1.05,荧光强度最大(3662a.u.)。FPUMs的荧光强度随pH的降低呈线性增加,可用于溶液中的pH检测。此外,FPUM表现出良好的热稳定性,抗干扰和可恢复性。
Rosin-based fluorescent polyurethane emulsion (FPU) was prepared using isophorone diisocyanate, ester of acrylic
rosin and glycidyl methacrylate, 1,5-dihydroxy naphthalene (1,5-DN), and 1,4-butanediol as the raw materials. Then,
rosin-based fluorescent polyurethane microspheres (FPUMs) were successfully prepared by suspension polymerization method using FPU as the main material, azodiisobutyronitrile as the initiator, and gelatin as the dispersant. FPUMs were characterized by Fourier transform infrared spectra, thermogravimetric analysis, optical microscopy, scanning electron microscopy and fluorescence spectra, and the response performance of FPUMs to pH was studied. The results showed that FPUMs were successfully prepared. With the increase of the level of 1,5-DN, the particle size of FPUMs increased gradually, and the fluorescence intensity increased first and then decreased. When the level of 1,5-DN was 3 wt.%, the average particle size was 49.3 μm, the particle distribution index (PDI) was 1.05, and the fluorescence intensity was the largest (3662 a.u.). The fluorescence intensity of FPUMs increased linearly with the decrease of pH, which can be used for pH detection in solution. Furthermore, the FPUMs exhibited good thermal stability, anti-interference and recoverability.