Heteroarm core cross-linked star polymers via RAFT copolymerization of styrene and bismaleimide

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We explored reversible addition-fragmentation chain transfer (RAFT) copolymerization of 1,2-bis(maleimidoethane) (BMI) with styrene (S) in the presence of polylactide macro-chain transfer agent (PLA-CTA) as a means to synthesize heteroarm core cross-linked star (CCS) polymers consisting of PLA and PS arms (PLA(n)PS(n)). Because of the strong alternating tendency of maleimide and styrenic double bonds, copolymerization of BMI with an excess of S depleted BMI in the early stage of polymerization forming a cross-linked core. The remaining S was successively polymerized to grow PS arms from the core, completing PLA(n)PSn via "in-out" mechanism. Use of a stoichiometric amount of S produced PLA(n), which could be used as a macro-CTA for the synthesis of more well-defined PLA(n)PSn. Compared with divinylbenzene, copolymerization of BMI with S was much more effective for core formation suggesting the importance of the alternating character of the copolymerization. While PLA(n)PSn existed as stable nanoparticles in a neutral solvent in contrast to linear PLA-b-PS, it also self-assembled to form microphase-separated structures in a selective solvent and in bulk indicating that PLA and PS arms can be intramolecularly segregated.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2016
Language
English
Article Type
Article
Keywords

FRAGMENTATION TRANSFER POLYMERIZATION; MICROPHASE SEPARATION; BLOCK-COPOLYMERS; MACROMOLECULAR ARCHITECTURES; DISPERSION POLYMERIZATION; RADICAL POLYMERIZATION; MICELLES; POLYSTYRENE

Citation

RSC ADVANCES, v.6, no.53, pp.47715 - 47722

ISSN
2046-2069
DOI
10.1039/c6ra07527d
URI
http://hdl.handle.net/10203/210202
Appears in Collection
NT-Journal Papers(저널논문)
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