Properties of syndiotactic-rich poly(vinyl alcohol) thin films in water. VI. Elastic behavior of undrawn/annealed thin films by repeated elongation/contraction in water

✍ Scribed by Kazuo Yamaura; Akihiro Hayakawa; Tetsuya Tanigami; Shuji Matsuzawa

• Publisher: John Wiley and Sons
• Year: 1988
• Tongue: English
• Weight: 405 KB
• Volume: 35
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1988.070350617

✦ Synopsis

The elastic behavior of undrawn/annealed swollen thin films of syndiotactic-rich poly(viny1 alcohol), derived from vinyl trifluoroacetate, was studied by repeated elongation/contraction in water. For the films annealed at temperatures below 175"C, the characteristic of deformation was divided into low-drawn and high-drawn regions. The elastic deformation was dominant over the plastic deformation in the low-drawn region and vice versa in the high-drawn region. The effect of heat treatment on the elastic behavior of the swollen films in water was almost independent of annealing temperatures below 125OC. The elastic deformation in water at 70°C was especially remarkable in the low-drawn region for the films annealed at temperatures below 125OC and at 80°C for the films annealed at 150°C. For the films annealed at 200"C, considerable plastic deformation occurred in addition to elastic deformation from the initial drawing; the films were broken in the low-drawn region.