NDLI: Facile synthesis of highly pure block copolymers by combination of RAFT polymerization, click reaction and de-grafting process

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhao, Guangdong Zhang, Peipei Zhao, Youliang Zhang, Chengbo
Copyright Year	2012
Abstract	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.
Starting Page	1803
Ending Page	1812
Page Count	10
File Format	HTM / HTML PDF
ISSN	17599954
Volume Number	3
Issue Number	7
Journal	Polymer Chemistry
DOI	10.1039/c1py00396h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Dispersity Cycloaddition Chain transfer Thiol Hydroxy group Aminolysis Polymerization Halogen Polystyrene Grafting Silicon dioxide
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Bioengineering Biomedical Engineering Polymers and Plastics

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