Effect of the molecular weight of poly(vinyl alcohol) on the water stability of a syndiotactic poly(vinyl alcohol)/iodine complex film |
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| Authors: | W Lyoo J Yeum H Ghim J Park S Lee J Kim D Shin J Lee |
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| Institution: | 1.School of Textiles, Yeungnam University, Kyongsan 712-749, South Korea,;2.Department of Dyeing and Finishing, Kyungpook National University, Taegu 702-701, South Korea,;3.School of Materials Science and Engineering, Seoul National University, Seoul 151-742, South Korea,;4.Department of Chemical Engineering, Sogang University, Seoul 121-742, South Korea,;5.Department of Chemical Engineering, Kwangwoon University, Seoul 139–701, South Korea, |
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| Abstract: | To precisely identify the effect of the molecular weight of syndiotactic poly(vinyl alcohol) (s-PVA) on the water stability of a s-PVA/iodine complex film, we prepared four s-PVAs with similar syndiotactic diad (s-diad) contents of about 63% and with different number-average degrees of polymerization, Pn, of 900, 6,000, 10,000, and 17,000, respectively. The desorption behavior of iodine in the s-PVA/iodine complex film in water was investigated in relation to the solubility of s-PVA in water. The degree of solubility of a s-PVA film having different Pn in water at 80 °C was limited to about 0.3-10%, whereas the degrees of solubility of atactic PVA films with Pn of 6,000 and 10,000 were 100% at the same conditions. The degree of iodine desorption of the complex film decreased with increasing Pn of s-PVA. Especially, the degree of iodine desorption of a PVA drawn film having Pn of 17,000 was limited to 2%, regardless of soaking temperature from 40 to 80 °C. The desorption of iodine in water was strongly affected by the dissolution of PVA. In addition, the degree of iodine desorption of the drawn s-PVA/iodine film was larger than that of the undrawn one. |
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