Water stability of syndiotactic poly(vinyl alcohol)/iodine complex film

✍ Scribed by Won Seok Lyoo; Jeong Hyun Yeum; Jin Hyun Choi; Han-Chul Song; Byung Chul Ji; Jae Pil Kim; Tae Hwan Noh; Woong Jae Yoon; Tae Sik Cheong

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 145 KB
• Volume: 82
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1829

✦ Synopsis

Abstract

The desorption behavior of iodine in syndiotactic poly(vinyl alcohol) (s‐PVA) with a syndiotactic diad content of 63.1% iodine film in water was investigated in relation to the solubility of s‐PVA in water. Despite a low number‐average degree of polymerization of 900, the degree of solubility of s‐PVA film in water at 80°C was limited to about 10%, whereas atactic poly(vinyl alcohol) (a‐PVA) film was completely soluble at a lower temperature, 50°C. The degree of iodine desorption of s‐PVA/iodine film at a high temperature decreased remarkably compared with that of a‐PVA/iodine film. The fastness of iodine of the drawn s‐PVA/iodine film was far superior to that of the undrawn film. Over a draw ratio of 5, the iodine desorption was suppressed significantly with increasing drawing temperature rather than the draw ratio. In addition, the iodine desorption of postdrawn s‐PVA/iodine film was lower than that of predrawn s‐PVA/iodine film. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 108–113, 2001