Unusual crystallization and melting processes of an optically active polyolefin: Isotacticpoly((s)-4-methyl-hexene-1)

Annamaria Buono, Jrjeng Ruan, Annette Thierry, Peter Neuenschwander, Bernard Lotz

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Polyolefins that bear a chiral side chain (typically an isobutyl group) experience a so-called macromolecular amplification of chirality: the chiral side-chain induces a slight preference for either tg or tg- main chain conformation. This slight conformational bias is amplified cooperatively along the chain, and results in preferred chirality of the main chain helical conformations. As a result, these polymers display a liquid-crystal (LC) phase both in solution and, in the melt as a transient phase on the way to crystallization. The existence of two processes (melt-LC and LC-crystal transitions) results in unconventional behaviors that were first analyzed by Pino and collaborators back in 1975. These polymers also offer a means to test the structural consequences of recently introduced crystallization schemes. These schemes postulate the formation of a transient liquid-crystal phase as a general scheme for polymer crystallization.

Original languageEnglish
Pages (from-to)165-170
Number of pages6
JournalChinese Journal of Polymer Science (English Edition)
Volume23
Issue number2
DOIs
Publication statusPublished - 2005 Mar 1

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Organic Chemistry
  • Polymers and Plastics

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