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Poly (vinyl alcohol)/nano-diamond composite films and hydrogels prepared by gamma ray

Frounchi, M ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1515/polyeng-2017-0290
  3. Publisher: De Gruyter , 2018
  4. Abstract:
  5. Poly (vinyl alcohol) and nano-diamond, PVA/ND, hydrogels were prepared and assessed as prosthetic material suitable for replacement of the nucleus pulposus. The hydrogels were prepared by gamma irradiation at various doses (15 kGy, 25 kGy, 35 kGy, 45 kGy) and at various ND concentrations ranging from 0.25 wt.% to 3 wt.%. Extent of gelation, equilibrium water content, and viscoelastic properties of swelled hydrogels at definite water contents were measured and examined as a function of ND concentration as well as gamma dose. According to viscoelastic measurements, the strength of hydrogels increased considerably over that of pure PVA at a low concentration of ND. By increasing irradiation dose, gel percent and strength of hydrogels increased. Hydrogel water content was in a range of 80 wt.% to 90 wt.% similar to that of natural nucleus pulposus. The G″ values of hydrogels were much smaller than G′ values indicating elastic behavior. Also PVA/ND nanocomposite films were prepared at various ND concentrations by solution casting. The ND particles were uniformly distributed within PVA films. Tensile modulus and strength of the films increased over pure PVA. © 2018 Walter de Gruyter GmbH, Berlin/Boston
  6. Keywords:
  7. Gamma irradiated hydrogel ; Nano-diamond ; Poly (vinyl alcohol) ; Film preparation ; Gamma rays ; Gelation ; Irradiation ; Nanocomposite films ; Nanodiamonds ; Polyvinyl alcohols ; Viscoelasticity ; Water content ; Elastic behavior ; Equilibrium water contents ; Gamma irradiation ; Low concentrations ; Nucleus pulposus ; Solution casting ; Viscoelastic measurements ; Viscoelastic properties ; Hydrogels
  8. Source: Journal of Polymer Engineering ; Volume 38, Issue 9 , 2018 , Pages 857-862 ; 03346447 (ISSN)
  9. URL: https://www.degruyter.com/view/j/polyeng.ahead-of-print/polyeng-2017-0290/polyeng-2017-0290.xml