Core hyper-cross-linked star polymers from block polymer micelle precursors

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This study explores hyper-cross-linking of the cores of block copolymer micelles as a means to generate star polymers with a hyper-cross-linked core surrounded by linear corona arms. A solution of poly(methyl methacrylate)-b-polystyrene (MS) was prepared in acetonitrile to form micelles which were reacted with alpha,alpha '-dichloro-p-xylene in the presence of FeCl3 to produce core hyper-cross-linked star (CHS) polymers by selective cross-linking of the PS core. A kinetic investigation showed formation of high-molar mass species (>10(4) kg mol(-1)) within 1 h of reaction, which supported conversion of individual MS micelles into CHS polymers. We synthesized several CHS polymers by varying the PS core fractions from 20 to 53%. All the polymers possessed discrete spherical cores that were 19-60 nm in diameter and all were highly soluble in organic solvents retaining the CHS architecture. While permanent microporosity was not detected by gas sorption measurements, increased dye uptake of CHS polymer in solution suggests utility of CHS polymers as stable and solution-processible nanocontainers with accessible free volume in the core.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2020-12
Language
English
Article Type
Article
Citation

POLYMER CHEMISTRY, v.11, no.45, pp.7178 - 7184

ISSN
1759-9954
DOI
10.1039/d0py01225d
URI
http://hdl.handle.net/10203/278485
Appears in Collection
CH-Journal Papers(저널논문)
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