Morphological analysis of telechelic ureidopyrimidone functional hydrogen bonding linear and star-shaped poly(ethylene-co-propylene)s

Brian D. Mather, Casey L. Elkins, Frederick L. Beyer, Timothy E. Long

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Ureidopyrimidone (UPy) end-functionalized linear and star-shaped poly(ethylene-co-propylene)s (hydrogenated polyisoprene) with molecular weights between 12K and 90K and narrow molecular weight distributions (PDI = M̄w/M̄n, < 1.10) were studied with SAXS and AFM. These hydrogen bond end-functionalized polymers (0.45-1.14 mol.-% UPy end-groups) unexpectedly exhibited microphase separated domains with interdomain spacings of approximately 10-15 nm suggesting a solid-state clustering of the hydrogen bonding end-groups beyond simple dimerization. The inter-domain spacings that were obtained from SAXS measurements systematically increased with molecular weight and decreased for monofunctional oligomers relative to telechelic analogs of the identical molecular weight. Variable temperature AFM measurements confirmed the presence of microphase separation at the surface for the star-shaped UPy end-functional poly(ethylene-co-propylene) and revealed a decrease in phase contrast upon heating to 130°C with retention of the microphase separated texture.

Original languageEnglish
Pages (from-to)1601-1606
Number of pages6
JournalMacromolecular Rapid Communications
Volume28
Issue number16
DOIs
Publication statusPublished - 2007 Aug 14
Externally publishedYes

Keywords

  • AFM
  • Microphase separation
  • Multiple hydrogen bonding
  • SAXS
  • UPy
  • Ureidopyrimidone

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics

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