Effect of homopolymer in polymerization-induced microphase separation process

Jongmin Park, Stacey A. Saba, Marc A. Hillmyer, Dong Chang Kang, Myungeun Seo

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

We report on the phase separation behaviors of polymerization mixtures containing a polylactide macro-chain transfer agent (PLA-CTA), styrene, divinylbenzene, hydroxyl-terminated PLA (PLA-OH), and a molecular chain transfer agent which enable the ability to tune the pore size of a cross-linked polymer monolith in a facile manner. Cross-linked monoliths were produced from the mixtures via reversible addition-fragmentation chain transfer (RAFT) polymerization and converted into cross-linked porous polymers by selective removal of PLA while retaining the parent morphology. We demonstrate that pore sizes are tunable over a wide range of length scales from the meso- to macroporous regimes by adjusting the ratio of PLA-CTA to PLA-OH in the reaction mixture which causes the phase separation mechanism to change from polymerization-induced microphase separation to polymerization-induced phase separation. The possibility of increasing porosity and inducing simultaneous micro- and macrophase separation was also realized by adjustments in the molar mass of PLA which enabled the synthesis of hierarchically meso- and macroporous polymers.

Original languageEnglish (US)
Pages (from-to)338-351
Number of pages14
JournalPolymer
Volume126
DOIs
StatePublished - Sep 22 2017

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Keywords

  • Block copolymer
  • Polymerization-induced phase separation
  • Porous polymer

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