Crystallization of photo-chain extended poly(ethylene glycol)

Scott R. Trenor, Timothy Edward Long, Brian J. Love

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Coumarin-functionalized polyethylene glycol) (PEG) monols and diols were isothermally crystallized at temperatures between 20 and 35°C before and after exposure to approximately 110Jcm-2 of ultra-violet A (λ >300nm, UVA) irradiation. Irradiation dimerized the coumarin groups and chain-extended the coumarin-functionalized PEG oligomers. The higher molecular weights reduced the crystal growth rate by as much as 50% compared to the non-irradiated coumarin-functionalized PEG oligomers under ambient crystallization conditions. Hoffman's kinetic nucleation theory was utilized to evaluate the types of nucleation that occurred for the coumarin-functionalized PEG diols (COU-PEG-COU). Crystallization regimes II and III were observed for the coumarin-modified PEG oligomers before and after exposure to UVA light.

Original languageEnglish
Pages (from-to)219-224
Number of pages6
JournalEuropean Polymer Journal
Volume41
Issue number2
DOIs
Publication statusPublished - 2005 Feb 1
Externally publishedYes

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Keywords

  • Coumarin
  • Crystallization
  • Photochemistry
  • Poly(ethylene glycol)

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

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