ABA triblock copolymers with a ring-opening metathesis polymerization/ macromolecular chain-transfer agent approach

Karen A. Switek, Kwanho Chang, Frank S. Bates, Marc A. Hillmyer

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Block copolymers containing polystyrene and polycyclooctene were synthesized with a ring-opening metathesis polymerization/chain-transfer approach. Polystyrene, containing appropriately placed olefins, was prepared by anionic polymerization and served as a macromolecular chain-transfer agent for the ring-opening metathesis polymerization of cyclooctene. These unsaturated polymers were subsequently converted to the corresponding saturated triblock copolymers with a simple heterogeneous catalytic hydrogenation step. The molecular and morphological characterization of the block copolymers was consistent with the absence of significant branching in the central polycyclooctene and polyethylene blocks [high melting temperatures (114-127 °C) and levels of crystallinity (17-42%)]. A dramatic improvement in both the long-range order and the mechanical properties of a microphase-separated, symmetric polystyrene-polycyclooctene-polystyrene block copolymer sample was observed after fractionation.

Original languageEnglish (US)
Pages (from-to)361-373
Number of pages13
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume45
Issue number3
DOIs
StatePublished - Feb 1 2007

Keywords

  • Anionic polymerization
  • Block copolymers
  • Macromolecular chain-transfer agents
  • ROMP
  • Thermoplastic elastomers

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