Temperature induced phase transition of interpenetrating polymer networks composed of poly(vinyl alcohol) and copolymers of N-isopropylacrylamide with acrylamide or 2-acrylamido-2-methylpropyl-sulfonic acid

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27 Citations (Scopus)

Abstract

Interpenetrating polymer networks (IPNs) composed of poly(vinyl alcohol) (PVA) and poly(N-isopropylacrylamide-co-X) (PNIPAAm-co-X) were prepared by using a two-step method. Hydrophilicity of PNIPAAm chains was increased by adding acrylamide (AAm; hydrophilic neutral monomer) or 2-acrylamido-2- methylpropylsulfonic acid (AMPS; anionic charged monomer). The effect of the incorporation of chemically crosslinked PVA into the temperature induced phase transition as well as swelling behavior of the responsive hydrogels were studied. The volume phase transition (VPT) of IPNs was investigated by cloud point measurement and differential scanning calorimetry. Significant differences in volume phase transition enthalpies of PNIPAAm (ΔHVPT) and volume phase transition temperatures (TVPT) were found. The ΔHVPT decreases with increasing co-monomer concentration. In several cases the phase transition was not followed by macroscopic shrinking of IPNs. Thus this property is advantageous for several technical applications.

Original languageEnglish
Pages (from-to)10011-10016
Number of pages6
JournalPolymer
Volume46
Issue number23
DOIs
Publication statusPublished - Nov 14 2005

Keywords

  • 'In situ' two-step method
  • Collapse transition
  • IPN

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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