Study on Various Compositions of Polyvinyl Alcohol and Starch Blends by Cross-Linking with Glyoxal

• 作者: Pradeep T. Gadekar Prakash A. Mahanwar Ravindra V. Gadhave
• 来源期刊: 高分子化学期刊(英文)
• 学科: 化学
• 关键词: STARCH Polyvinyl ALCOHOL Cross-Linking GLYOXAL Mechanical Testing
• 年，卷（期）: gfzhxqkyw_2019,（4）
• 页码范围: 76-85
• 页数: 10页
• 分类号: O63

摘要

The aim of this study is to analyze the various compositions of polyvinyl alcohol (PVA) and starch blends. The blends have been cross-linked with glyoxal to enhance its properties. The hydroxyl groups of PVA and starch react with glyoxal via formation of acetal bonds;hence crosslinking could take place. The cross-linking of glyoxal is observed in various analytical methods such as DSC and FTIR. The cross-linked blends showed better thermal and mechanical properties. Viscosity, tensile shear strength, pencil hardness and ultimate stress were evaluated to estimate the changes due to cross-linking. It was observed that the cross-linking is directly proportional to starch, since the starch hydroxyl groups are easily accessible for reacting. The cross-linked blend showed better cohesion between its chains, thereby increasing glass transition temperature. It was reflected in the subsequent increase in tensile strength properties.