Using hyperbranched macromers as crosslinkers of methacrylic networks prepared by photopolymerization

Sara Pedrón, Paula Bosch, Carmen Peinado

Research output: Contribution to journalArticlepeer-review

Abstract

Hyperbranched polymers were modified with terminal methacryloyl groups to be used as crosslinkers. The photoinitiated polymerization of several methacrylic monomers was examined in the presence of the hyperbranched macromers and bis-(2,4,6-trimethylbenzoyl)-phenylphosphine oxide (Irgacure 819®) as a photoinitiator, upon UV irradiation. The photopolymerization kinetics was systematically studied by fluorescence and photoDSC in real time and in situ. Six types of monofunctional methacrylic monomers, two types of difunctional methacrylic monomers and four types of (meth)acrylate-modified hyperbranched macromers with different structures were employed for series of photopolymerization reactions. The incorporation of the hyperbranched macromers allows to increase the conversion at gelation and thus, final conversion. This behaviour is dependent on monomer and macromer nature and has been explained as due to an increase of the free volume fraction and confirmed by fluorescence. The results indicate that H-bonding and π-stacking induce self-assembly of hyperbranched macromers leading to reaction induced phase separation at the highest concentration of hyperbranched macromer used.

Original languageEnglish (US)
Pages (from-to)126-140
Number of pages15
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume200
Issue number2-3
DOIs
StatePublished - Dec 15 2008
Externally publishedYes

Keywords

  • Fluorescence
  • Hyperbranched macromers
  • Networks
  • Photopolymerization
  • Self-assembly

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)

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