Polymer Science

Colloid and Polymer Science

, Volume 264, Issue 7, pp 595-601

Morphology and structure of highly elastic poly(vinyl alcohol) hydrogel prepared by repeated freezing-and-melting

  • F. YokoyamaAffiliated withDepartment of Industrial Chemistry, School of Engineering, Okayama University
  • , I. MasadaAffiliated withDepartment of Industrial Chemistry, School of Engineering, Okayama University
  • , K. ShimamuraAffiliated withDepartment of Industrial Chemistry, School of Engineering, Okayama University
  • , T. IkawaAffiliated withDepartment of Industrial Chemistry, School of Engineering, Okayama University
  • , K. MonobeAffiliated withDepartment of Industrial Chemistry, School of Engineering, Okayama University

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Abstract

Morphology and structure of poly(vinyl alcohol) (PVA) hydrogel prepared by the “repeated freezing-and-melting” method have been investigated by X-ray diffraction, scanning electron microscopy, light-optical microscopy, and simple tension test. The PVA aqueous solution gelled highly by using this method to show rubber-like elasticity, reflecting the gel network in which the amorphous chains are physically cross-linked by the crystallites. The gel morphology was characterized by the porous structure, which was originated from the gelation of continuous PVA-rich solution phase segregated around copious ice crystal phases formed upon freezing. The high gelling ability involved in this method was closely related to the segregation mechanism.

Key words

Poly(vinyl alcohol) water gel