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以香豆素为光敏感基元,通过多步反应制备了三臂ATRP引发剂C-Br3,然后以CuBr/PMDETA为催化体系、甲基丙烯酸2-(二甲氨基)乙酯(DMAEMA)为单体,ATRP聚合法制备了三臂星形聚合物C-(PDMAEMA)3.用傅里叶变换红外光谱仪(FTIR)、紫外-可见光分光光度计(UV-Vis)和核磁共振仪(1H-NMR)等对C-Br3及聚合物进行了结构表征.研究表明,该三臂星形聚合物可在水中直接形成胶束,且该聚合物可在365和254 nm交替紫外光照下发生可逆光二聚反应.纳米粒度跟踪显示,光照前其胶束粒径为(87.7±27.8)nm、呈高斯分布;而在365和254 nm光反应后,聚合物胶束粒径大小与分布仅发生微弱变化.这可能是因为在光二聚反应前后,聚合物的双亲结构变化微弱所致.
Three-arm ATRP initiator C-Br3 was prepared by multi-step reaction using coumarin as photosensitizer. Then CuBr / PMDETA was used as catalyst system. The content of 2- (dimethylamino) ethylmethacrylate Three-arm star polymer C- (PDMAEMA) 3 was synthesized by ATRP polymerization using Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectrophotometer (UV-Vis) and nuclear magnetic resonance (1H- NMR) were used to characterize the structure of C-Br3 and the polymer.The results showed that the three-arm star polymer can form micelles directly in water and the polymer can produce reversible light at 365 and 254 nm alternating UV light Dimerization.Nano-particle size tracking showed that the particle size of the micelles was (87.7 ± 27.8) nm and showed a Gaussian distribution before light irradiation, whereas the particle size and distribution of the polymer micelles were only weak after 365 and 254 nm photoreactions This may be due to the diminution of the parental structure of the polymer before and after photodimerization.