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Biomass Chemical Engineering ›› 2019, Vol. 53 ›› Issue (3): 39-45.doi: 10.3969/j.issn.1673-5854.2019.03.006

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Preparation and Property Characterization of Polyvinyl Alcohol Hydrogel with Anisotropic Structure

Lin ZHANG1,Huiliang WANG2,*()   

  1. 1. Department of Chemical and Material Engineering, Yingkou Institute of Technology, Yingkou 115014, China
    2. College of Chemistry, Beijing Normal University, Beijing 100875, China
  • Received:2018-10-23 Online:2019-05-30 Published:2019-06-04
  • Contact: Huiliang WANG E-mail:403402291@qq.com
  • Supported by:
    国家自然科学基金资助项目(1875023)

Abstract:

Polyvinyl alcohol(PVA) hydrogels with anisotropic microstructures were firstly prepared by directional freezing-thawing(DFT) of PVA aqueous solution, and then they were crosslinked with 60Co γ-rays irradiation to improve their thermal stability and mechanical properties. Scanning electron microscopy(SEM) showed that original anisotropic microstructures of PVA hydrogels could be maintained after radiation-induced crosslinking. Long aligned channels were found along the parallel direction, pores with similar sizes were found along the perpendicular direction. The thermal stability tests showed that the PVA hydrogels prepared with one directional freezing-thawing cycle and irradiated with 30-70 kGy 60Co γ-rays could maintain their original gel states in 60℃ water for more than 10 h. Tensile mechanical testing showed that the radiation crosslinked PVA hydrogels(DFT-RC-3-10) maintained their anisotropic tensile properties, moreover, the tensile strengths and elastic moduli of the radiation crosslinked PVA hydrogels(DFT-RC-3-10) were enhanced, for the PVA gel samples prepared with three directional freezing-thawing cycles and irradiated with 10 kGy 60Co γ-ray, the tensile strength and elastic modulus in the direction perpendicular to the freezing direction were enhanced to 0.86 and 0.10 MPa, respectively.

Key words: PVA hydrogels, irradiation, thermostability, anisotropy

CLC Number: