Side-Chain Density Driven Morphology Transition in Brush-Linear Diblock Copolymers

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We report the synthesis and self-assembly of brush-linear diblock copolymers with variable side-chain length and density. Poly(pentafluorophenyl acrylate-g-ethylene glycol)-b-polystyrene ((PPFPA-g-PEG)-b-PS) brush-linear diblock copolymers are prepared by sequential reversible addition-fragmentation chain transfer (RAFT) polymerization of PPFPA and PS, followed by postpolymerization reaction between the precursor PPFPA-b-PS diblock copolymer and amine-functionalized PEG. By controlling the PEG chain length and the degree of substitution, we obtained brush-linear diblock copolymers with different side-chain lengths and densities. The solid-state morphologies of the diblocks are then examined by small-angle X-ray scattering (SAXS). At low PEG side-chain density, the segregation of PEG and PS away from PPFPA leads to the formation of PEG and PS lamellar domains with PPFPA in the interface. At high PEG side-chain density, the segregation is between the PPFPA-g-PEG brush block and the PS linear block, and the domain morphology is determined by the composition of the brush block. A partial experimental phase diagram is presented, and it illustrates the importance of both side-chain length and density on the microdomain morphology of brush-linear diblock copolymers.
Publisher
AMER CHEMICAL SOC
Issue Date
2022-04
Language
English
Article Type
Article
Citation

ACS MACRO LETTERS, v.11, no.4, pp.468 - 474

ISSN
2161-1653
DOI
10.1021/acsmacrolett.2c00068
URI
http://hdl.handle.net/10203/296543
Appears in Collection
CH-Journal Papers(저널논문)CBE-Journal Papers(저널논문)
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