Tear force of physically crosslinked poly(vinyl alcohol) gels with different submicrometer-scale network structures

Taegu Noh, Yujiro Bando, Kensuke Ota, Saori Sasaki, Atsushi Suzuki

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Poly(vinyl alcohol) (PVA) gels can be easily prepared by either the freeze-thawing (FT gel) method or by the cast-drying (CD gel) method. Although the resulting nanostructured networks of the FT and CD gels are similar, their physical properties are quite different; while CD gels are transparent and elastic, FT gels are opaque and less elastic. Moreover, the tear energy of the FT gels is much greater than that of the CD gels, which is a direct result of micrometer-scale differences in their network structures. In order to control the distribution of microcrystallites on nano- and micrometer scales, FT gels were prepared from PVA solutions with different water contents. As a result, the gel gradually became more transparent as the initial water content was decreased; and accordingly, the tear energy decreased. Tear resistance was improved in the case of FT gels by repeating the number of FT cycles, whereas with CD gels, this was achieved by increasing the gelation temperature. These results indicate that the microscopic network structures are characterized by a micrometer-scale bundled-polymer (fibril), which determines the tear energy of FT gels. Simple methods to control the fibril network structure of FT gels using a unidirectional freezing method are presented herein, with the swelling and mechanical properties of modified FT gels discussed in terms of their multiple-scale network structures.

Original languageEnglish
Article number41356
JournalJournal of Applied Polymer Science
Volume132
Issue number4
DOIs
Publication statusPublished - Jan 1 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

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