Synthesis via RAFT Polymerization of Tadpole-Shaped Organic/Inorganic Hybrid Poly(acrylic acid) Containing Polyhedral Oligomeric Silsesquioxane (POSS) and Their Self-assembly in Water
Synthesis via RAFT Polymerization of Tadpole-Shaped Organic/Inorganic Hybrid Poly(acrylic acid) Containing Polyhedral Oligomeric Silsesquioxane (POSS) and Their Self-assembly in Water
复制标题
DOI：
10.1021/ma802803d
复制
发表时间：
2009-03
期刊：
影响因子：
5.5
通讯作者：
Weian Zhang;B. Fang;A. Walther;A. Müller
中科院分区：
文献类型：
--
作者：
Weian Zhang;B. Fang;A. Walther;A. Müller
采用含 POSS 的链转移剂 (CTA) 通过丙烯酸叔丁酯 (tBA) 的 RAFT 聚合制备蝌蚪形无机/有机杂化聚丙烯酸叔丁酯。聚合动力学表现出准一级行为，诱导期短；数均分子量随转化率线性增加。结合低多分散性（PDI < 1.3），这证实了受控聚合。 POSS-PtBA 进一步水解成两亲性蝌蚪形聚丙烯酸（POSS-PAA）。通过透射电子显微镜 (TEM) 以及静态和动态光散射（SLS 和 DLS）研究了 POSS-PAA 在 pH = 8.5 水溶液中的自组装行为。结果表明，POSS-PAA 在水中自组装成相当大的聚集体，其中 POSS 部分分散在颗粒中。尺寸（DLS 测定的平均半径约 60 nm）几乎与 PAA 的链长无关。聚集体具有 pH 响应性，当减少时会收缩...
Tadpole-shaped inorganic/organic hybrid poly(tert-butyl acrylate) was prepared by RAFT polymerization of tert-butyl acrylate (tBA) using a POSS-containing chain transfer agent (CTA). The polymerization kinetics showed a pseudofirst-order behavior with a short induction period; the number-average molecular weights linearly increase with conversion. In conjunction with low polydispersity (PDI < 1.3), this confirms a controlled polymerization. POSS-PtBA was further hydrolyzed into amphiphilic, tadpole-shaped poly(acrylic acid) (POSS-PAA). The self-assembly behavior of POSS-PAA in aqueous solution at pH = 8.5 was investigated by transmission electron microscopy (TEM) as well as static and dynamic light scattering (SLS and DLS). The results show that POSS-PAA self-assembles in water into rather large aggregates where the POSS moieties are dispersed in the particle. The size (average radius ≈ 60 nm by DLS) is nearly independent of the chain length of PAA. The aggregates are pH-responsive, contracting when decre...