Chemically cross-linked polycyclooctene: Synthesis, characterization, and shape memory behavior

Changdeng Liu, Seung B. Chun, Patrick T. Mather, Lei Zheng, Elisabeth H. Haley, E. Bryan Coughlin

Research output: Contribution to journalArticle

223 Scopus citations

Abstract

A novel polymeric shape memory system of chemically cross-linked polycyclooctene (PCO) was developed and characterized. PCO was synthesized via ring-opening metathesis polymerization of cyclooctene using the dihydroimidazolylidene-modified Grubb's catalyst. After dicumyl peroxide was added to PCO, the mixture was compression-molded into a film and further cured through chemical cross-linking upon heating. The chemically cross-linked PCO samples were fully characterized using differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and wide-angle X-ray scattering (WAXS) in order to gain insight into the rapid shape memory behavior. We observe that the transition temperature of PCO is tunable through the change of the trans/cis ratio of vinylene groups. A fast shape memory behavior was observed, where the primary stress-free shape was recovered within 1 s on immersion in hot water above the melting point of the crystalline PCO phase. In contrast with glassy shape memory polymers, chemically cross-linked PCO behaves as an elastomer capable of arbitrary shaping above the sharp melting temperature of the PCO crystalline phase and subsequent shape fixing during crystallization.

Original languageEnglish (US)
Pages (from-to)9868-9874
Number of pages7
JournalMacromolecules
Volume35
Issue number27
DOIs
StatePublished - Dec 31 2002

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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    Liu, C., Chun, S. B., Mather, P. T., Zheng, L., Haley, E. H., & Coughlin, E. B. (2002). Chemically cross-linked polycyclooctene: Synthesis, characterization, and shape memory behavior. Macromolecules, 35(27), 9868-9874. https://doi.org/10.1021/ma021141j