Effect of degree of saponification on properties of films obtained from PVA/NaCl/H2O system

• Published in: Journal of materials science Vol. 41; no. 7; pp. 1979 - 1982
• Main Authors: IWASEYA, M, KATSUYAMA, N, YAMAURA, K, DAI, L.-X
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01.04.2006; Springer Nature B.V
• Subjects: Applied sciences; Atacticity; Crystal structure; Crystallinity; Degree of crystallinity; Draw ratio; Exact sciences and technology; Forms of application and semi-finished materials; Materials science; Modulus of elasticity; Polymer industry, paints, wood; Polyvinyl alcohol; Properties (attributes); Sheets and films; Technology of polymers; Temperature; Molecular structure; Film; Mechanical properties; Tensile property; Crystallinity; Experimental study; Property processing relationship; Saponification; Structure processing relationship; Polyvinylalcohol; Property structure relationship; Manufacturing; Growth from solution; Atactic polymer
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-006-3082-0

Properties of the film obtained from the solution of atactic-polyvinyl alcohol (PVA)/NaCl/H2O system were investigated through changing the degree of saponification (DS) and NaCl concentration. The films had a higher crystallinity as well as a higher draw ratio than pure PVA film. Maximum values of degree of crystallinity and draw ratio of the films were 38.5% and 17.8, respectively. The highest tensile modulus of the films was at DS 99.05 mol% and NaCl concentration 2 wt.%. These results indicated that the NaCl concentration control has a beneficial effect on properties upgrade of PVA film, but the DS control was effective in control of degree of crystallinity.