Modulating light-tunable acid sensitivity of a bioinspired polymer simply by adjusting the position of a single methoxy substituent
作者:Zhilin Liu、Yufang Tang、Nan Li、Lican Lu、Junjie Deng、Yuanli Cai
DOI:10.1002/pola.25057
日期:2012.2.1
This article describes a rhodopsin‐inspired photosensitive polymer whose light‐tunable acid sensitivity can be widely modulated simply by adjusting the position of a single methoxy substituent in the aromatic rings of cinnamyl groups. The well‐defined poly(5‐ethyl‐5‐methacryloyloxymethyl‐2‐(p‐methoxystyryl)‐[1,3]dioxane) (PEMpMSD) and poly(5‐ethyl‐5‐methacryloyloxymethyl‐2‐(o‐methoxystyryl)‐[1,3]dioxane)
本文介绍了一种由视紫红质启发的光敏聚合物,其光可调酸敏感性可通过简单地调节肉桂基芳环中单个甲氧基取代基的位置来广泛调节。该明确定义的聚(5-乙基-5-丙烯酰氧基甲基-2-(p -methoxystyryl) - [1,3]二恶烷)(PEM p MSD)和聚(5-乙基-5-丙烯酰氧基甲基-2-(ø -通过可逆加成-断裂链转移(RAFT)合成了甲氧基苯乙烯基)-[1,3]二恶烷(PEM o MSD)以及聚(5-乙基-5-甲基丙烯酰氧基甲基-2-苯乙烯基[1,3]二恶烷) ) 过程。结果表明,EM p的对甲氧基取代在25°C的温和可见光辐射下,MSD单体比5-乙基-5-甲基丙烯酰氧基甲基-2-苯乙烯基[1,3]二恶烷单体缩短了RAFT过程的初始化周期,并使链扩散更快。PEM o MSD的邻甲氧基取代导致超过80%的高度光诱导Z异构化。此外,PEM p MSD的对甲氧基取代导致环境酸介质中环状缩醛键的快速水解,而PEM