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以引发单体为基础,通过两种可控聚合方法,即原子转移自由基聚合(ATRP)和开环易位聚合(ROMP)的联用,合成一种新型侧链含偶氮苯基团的接枝聚合物刷.含叔溴的降冰片烯引发剂首先引发偶氮苯单体的ATRP反应,生成聚合物接枝链,每条接枝链上都带有偶氮苯基团;然后,将具有高环张力降冰片烯的ATRP聚合物作为大分子单体,在第三代Grubbs催化剂的引发下进行ROMP反应,生成结构明确的新型接枝共聚物.其主链每个单体单元上均含有一条带偶氮苯基团的接枝链.最后,研究此类接枝共聚物在紫外与可见光照射下的光响应性能,并用UV-Vis分光光度计研究其在溶液中的顺反异构化过程.
Based on the initiating monomers, a new type of azobenzene group containing side chain was synthesized by two controlled polymerization methods, atom transfer radical polymerization (ATRP) and ring opening metathesis polymerization (ROMP) Graft polymer brushes containing tertiary bromine-norbornene initiator initiator azobenzene monomer ATRP reaction first to generate a polymer graft chain, each graft chain with azobenzene groups; and then, The ATRP polymer with high ring tension norbornene was used as macromonomer and ROMP reaction was initiated under the third generation of Grubbs catalyst to produce a well-defined novel graft copolymer. The main chain of each monomer unit Both contain a graft chain with azobenzene groups.Finally, the photoresponsive properties of these graft copolymers under ultraviolet and visible light irradiation were studied, and their cis-trans-isomers in solution were studied by UV-Vis spectrophotometer Structuring process.