期刊
POLYMER CHEMISTRY
卷 3, 期 7, 页码 1803-1812出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1py00396h
关键词
-
资金
- National Natural Science Foundation of China [20844001, 20874067, 21074081]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
A facile strategy for synthesizing highly pure block copolymers with polymeric segments such as polystyrene, polyacrylamides and polyacrylates was described. The methodology involves a grafting reaction by tandem RAFT polymerization and azide-alkyne cycloaddition reaction and a subsequent de-grafting reaction via aminolysis or radical-induced addition-fragmentation reaction. S-methoxycarbonylphenylmethyl S'-propynyloxycarbonylethyltrithiocarbonate was used to synthesize Z-alkyne-functionalized macro chain transfer agents, and silica particles grafted with well-defined living block copolymers were obtained by simultaneous RAFT process and click reaction using clickable RAFT agents and azido-functionalized silica particles as raw materials. This approach afforded grafted polymers with polydispersity typically lower than 1.2 and silica-polymer hybrids with grafting density in the range of 0.020-0.091 chains nm(-2) as the grafted chains had molecular weights between 4920 and 26 300 g mol(-1). Highly pure block copolymers with terminal functionalities such as thiol, methyldithio, carboxyl, hydroxyl and halogen were obtained by a de-grafting process and postmodification, and azido-functionalized silica particles were efficiently recovered. The cycles of grafting and de-grafting reactions could be applied many times, and no significant decrease in grafting density was noted, indicating the versatility and generality of this approach for surface modification, synthesis of high-purity block copolymers and recycling of clickable solid substrate.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据