Accessing photo-based morphological control in phase-separated, cross-linked networks through delayed gelation

Caroline R. Szczepanski, Jeffrey W. Stansbury*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

This work presents an approach to extend the period for phase separation, independent of temperature, in ambient phase-separating photopolymerizations based on the copolymerization of structurally similar mono- and di-vinyl monomers. Copolymer resins composed of triethylene glycol dimethacrylate (TEGDMA) and ethylene glycol methyl ether methacrylate (EGMEMA) were modified with a thermoplastic prepolymer, poly(butyl methacrylate). With increasing EGMEMA modification into the bulk TEGDMA resin, there is a decrease in the initial reaction rate, which increases the time for development of compositionally different phases prior to network gelation. The period between phase separation and gelation was probed through optical and rheological measurements, and it was extended from 22 s in a TEGDMA resin to 69 s in a TEGDMA:EGMEMA copolymer, allowing these materials to be processed under a wide range of UV-irradiation intensities (300 μW cm-2-100 mW cm-2), which provided an additional degree of control over the resulting phase separated domain size and morphology.

Original languageEnglish (US)
Pages (from-to)314-325
Number of pages12
JournalEuropean Polymer Journal
Volume67
DOIs
StatePublished - Jun 1 2015

Keywords

  • Heterogeneous polymers
  • Kinetic control
  • Phase separation
  • Photopolymerization

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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