Influence of actinic wavelength on properties of light-cured interpenetrating polymer networks

F. Karasu Kilic, C. Rocco, M. Lecompère, C. Croutxé-Barghorn, X. Allonas, Yujing Zhang, A.C.C. Esteves, Leendert van der Ven, Rolf van Benthem, Bert de With

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Interpenetrating polymer networks (IPNs) composed of different acrylate/epoxide ratios, were synthesized under UV and visible-LED curing conditions. The formation of the IPNs was explored in terms of phase separation, polymerization mechanisms, final mechanical properties and surface morphology. For these purpose, we uniquely combined results of miscibility investigations, confocal Raman microscopy, dynamical mechanical analysis and atomic force microscopy. Transparent films were obtained for all compositions and both irradiation sources. The thermo-mechanical properties of different IPNs were associated to the presence of acrylate- or epoxide-rich phases, as well as, mixed interphases, resulting from the high interpenetration between both networks. Although the final conversions were similar under UV and visible-LED irradiation, we have found evidence that the visible-cured samples provide higher IPN homogeneity and lower Tg, for a higher epoxide content. To explain this trend, the mechanisms and sequence of the acrylate or epoxide networks formation, under UV or LED irradiation, is discussed.

Original languageEnglish
Pages (from-to)1378-1390
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Issue number10
Publication statusPublished - 15 May 2016


  • Acrylate/epoxide polymerization
  • Interpenetrating polymer networks
  • LED curing
  • Morphology characterization
  • Thermo-mechanical analysis


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