Morphology transitions in RAFT polymerization
Morphology transitions in RAFT polymerization
复制标题
RAFT 聚合中的形态转变
DOI：
10.1039/c0sm00284d
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发表时间：
2010-01-01
期刊：
影响因子：
3.4
通讯作者：
Pan, Caiyuan
中科院分区：
文献类型：
--
作者：
Cai, Weimin;Wan, Wenming;Pan, Caiyuan
利用聚合诱导自组装技术制备了具有多种形貌的聚合物纳米结构材料。以二硫代苯甲酸氰基异丙酯封端的聚甲基丙烯酸二甲氨基乙酯（PDMAEMA-DBT）为大分子链转移剂和稳定剂，在选择性溶剂甲醇中进行苯乙烯的可逆加成-断裂链转移（RAFT）聚合，考察了影响聚合物形态形成的因素。通过改变投料比和反应条件，得到了不同形貌的球形胶束、纳米线、囊泡和大复合囊泡。首次观察到在同一体系中，通过增加疏水链段与亲水链段的链长比，从球形胶束到纳米串、囊泡和大复合囊泡的连续形态转变。这种方法可以在高浓度下进行，因此它可以按比例放大，用于以相对高的体积可再现地制备纳米结构材料。
Polymerization-induced self-assembly and re-organization (PISR) was used to prepare polymeric nanostructured materials with a variety of morphologies. Reversible addition-fragmentation chain transfer (RAFT) polymerization of styrene in a selective solvent, methanol, was carried out using cyanoisopropyl dithiobenzoate-terminated poly(2-dimethylaminoethyl methacrylate) (PDMAEMA-DBT) as the macro chain transfer agent and stabilizer for investigation of the factors influencing the formation of morphologies. Various morphologies, including spherical micelles, nanostrings, vesicles and large compound vesicles, with different shapes were obtained by changing the feed ratios and reaction conditions. The sequential morphologic transitions from spherical micelles to nanostrings, to vesicles and to large compound vesicles via increasing the chain length ratio of the hydrophobic block to the hydrophilic one in the same system were observed for the first time. This approach can be performed at a high concentration, thus it can be scaled up for the reproducible preparation of nanostructured materials in a relatively high volume.