1 0 0 0 OA ホウ酸架橋ポリビニルアルコールゲルフィルムの構造と物性
- 著者
- 佐野 真弘 柴山 充弘 櫻井 伸一 黒川 秀信 野村 春治
- 出版者
- The Society of Fiber Science and Technology, Japan
- 雑誌
- 繊維学会誌 (ISSN:00379875)
- 巻号頁・発行日
- vol.48, no.2, pp.74-83, 1992-02-10 (Released:2008-11-28)
- 参考文献数
- 32
- 被引用文献数
- 1 1
Poly (vinyl alcohol) (PVA) reacts with borate ions to give a thermoreversible gel. In this work, gel films (PVA-G) were successfully prepared by drying this gel or by soaking PVA films (PVA-O; crosslink-free PVA films) in a solution containing borate ions. On the other hand, the crosslinks formed in PVA-G can be removed by soaking PVA-G in an acid solution. The mechanical properties and structure of PVA-G were investigated by means of dynamic viscoelastic, wide angle X-ray diffraction, hot water resistance and thermogravimetric measurements, and were compared with those of PVA-O.The results of dynamic viscoelastic measurements show that PVA-G retains a high value in storage modulus up to ca. 200°C which are different from PVA-O. In addition, there appeared a mechanical dispersion around ca. 220°C. Wide angle X-ray diffraction patterns show that the crystallite size of PVA-G is smaller than PVA-O. The characteristic behaviors in viscoelasticity are explained by the presence of crosslinks and/or crystallite size. Hot water resistance of PVA-G was also found to be improved by the introduction of crosslinks.
1 0 0 0 OA 高分子の体積相転移
- 著者
- 柴山 充弘
- 出版者
- 公益社団法人 高分子学会
- 雑誌
- 高分子 (ISSN:04541138)
- 巻号頁・発行日
- vol.54, no.7, pp.462-465, 2005-07-01 (Released:2011-10-14)
- 参考文献数
- 29
- 被引用文献数
- 1 2
高分子ゲルの体積相転移が発見されてから約四半世紀が経過した。体積相転移を利用したさまざまなスマートゲルが開発されてきているなか,こうした発展を支えるゲルの構造学を,相転移,相分離,不均一性という観点から,ナノ構造と膨潤収縮現象との関係を鳥瞰する。