| Summary: | 碩士 === 國立臺灣科技大學 === 高分子系 === 98 === In this study, the high strength of hydrogel prepared from poly (vinyl alcohol) and poly(N-vinyl pyrrolidone). Poly (vinyl alcohol) hydrogel were first prepared by freezing and thawing method. The effects of various factors on the mechanical and swelling properties of the PVA hydrogel were investigated. The tensile strength and average tensile modulus of PVA hydrogel both increase as the concentration of PVA aqueous solution. The research of swelling dynamic and water content behavior shows that it decreases with the increasing PVA hydrogel concentration.
In the present work, blend hydrogels based on PVA and different molecular weight of poly (vinyl pyrrolidone) (PVP) were prepared by repeated freezing and thawing method. Such hydrogel had similar internal three-dimensional structure and water content approximately 300(%) .
The poly (vinyl alcohol)/poly (N-vinyl pyrrolidone) (PVA/PVP) hydrogels were prepared by CO-solution method and treated with repeated freezing and thawing method. The composite material was analyzed by infrared spectroscopy, X-ray diffraction, differential scanning calorimeter. Its water absorption, swelling ratio, and mechanical property were also tested. The results show that PVP can chemically bond with PVA and form composite hydrogel with PVA in molecular level. The different molecular weight of PVP can affect the micro structure, crystalinity, glass transition temperature, water absorption, swelling ratio and mechanical property of PVA hydrogel .The PVP/PVA hydrogel has high water content and mechanical property.
The tensile strength and average tensile modulus of PVA/PVP hydrogel both increased with the increase of the molecular weight of PVP. The research of swelling dynamic and water content behavior shows that it decreases with the increase of the molecular weight of PVP.
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