Light‐sensitive 2‐oxoacetate‐derived polystyrene copolymers are investigated for the controlled release of fragrances. The stimuli‐responsive delivery systems are efficiently prepared in a two‐step reaction sequence. Simultaneous Friedel–Crafts acylation and cationic polymerization of styrene give access to 2‐oxoacetate‐derived polystyrenes in one step; the fragrance to be released is then introduced by organotin‐catalyzed transesterification in a second step. The performance of the copolymer conjugates releasing either individual fragrance raw materials or a fragrance mixture is evaluated by dynamic headspace analysis in the presence of surfactants on different substrates and compared with their non‐polymeric analogues. Direct and indirect deposition of the delivery systems onto cotton in a fabric softening application show that differences in performance are correlated with the amount of surface deposition. In the present study, the copolymer that releases a fragrance mixture performs better than the copolymers that release the corresponding fragrances individually and better than the respective non‐polymeric profragrances.

中文翻译：

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聚苯乙烯基2-氧代乙酸酯在实际应用条件下可轻度释放香气

研究了光敏2-氧代乙酸酯衍生的聚苯乙烯共聚物对香料的控制释放。刺激响应的传递系统可以按照两步反应顺序进行高效准备。苯乙烯同时进行Friedel-Crafts酰化和阳离子聚合，可一步获得2-氧代乙酸酯衍生的聚苯乙烯。然后在第二步中通过有机锡催化的酯交换反应引入要释放的香料。在表面活性剂存在于不同基质上的情况下，通过动态顶空分析评估释放出单独的香料原料或香料混合物的共聚物共轭物的性能，并将其与非聚合类似物进行比较。在织物柔软应用中，将输送系统直接和间接沉积到棉花上表明，性能差异与表面沉积量有关。在本研究中，释放出香气混合物的共聚物比单独释放出相应香气的共聚物表现更好，并且比各自的非聚合香精更好。