Enhanced site isolation in cross-link-functionalized polystyrene networks: Mobility studies using steady-state fluorescence and ESR techniques

Mark E. Wilson, Jennifer A. Wilson, Mark J. Kurth

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Enhanced site isolation and reduced site mobility have been demonstrated in polystyrene networks having trityl functionality at the cross-links through steady-state fluorescence measurements of intraresin excimer formation by 4-(1-pyrenyl)butanol labels and through ESR nitroxide spin-label studies. Suspension (copolymerization of α,α-bis(4-vinylphenyl)benzyl alcohol with styrene afforded beads having trityl groups at the cross-links (C·Tr). Pendent-functionalized beads (P·Tr), prepared by copolymerization of of α,α-diphenyl-4-vinylbenzyl alcohol with styrene and divinylbenzene served as a reference. Comparison of (Ie/Im) as a function of polymer loading and solvent demonstrated that crosslink functionalization reduced site interactions, providing 30% higher effective dilution of labels. ESR of. polymers labeled with 2,2,6,6-tetramethyl-4-oxopiperidin-1-oxyl oxime demonstrated C·Tr are less mobile than P·Tr. Possible origins of enhanced site-separation and reduced mobility are discussed and explored through various experimentes.

Original languageEnglish (US)
Pages (from-to)3340-3348
Number of pages9
JournalMacromolecules
Volume30
Issue number11
StatePublished - Jun 2 1997

ASJC Scopus subject areas

  • Materials Chemistry

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