Study on Time Resolved Molecular Orientation of Hydrogen-Bonding Polymers by Polarized ATR-FTIR Measurement under a Flow Field

流场下偏振 ATR-FTIR 测量氢键聚合物时间分辨分子取向研究

• 批准号: 21350126
• 负责人: URAKAWA Osamu
• 金额: $ 12.31万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21350126/
• 关键词: レオロジー; 水素結合; ATR-FTIR; 高分子; RHEO-ATR-FTIR; ポリビニルアルコール; ポリ酢酸ビニル; shear thinning; ストレスオーバーシュート; 非線形; 分子間会合; 分子配向; FTIR; ATR; レオメーター; レオロジー; 水素結合; ATR-FTIR; 高分子; RHEO-ATR-FTIR; ポリビニルアルコール; ポリ酢酸ビニル; shear thinning; ストレスオーバーシュート; 非線形; 分子間会合; 分子配向; FTIR; ATR; レオメーター

We conducted linear and non-liner rheological measurements and also FTIR measurement under a shear flow for hydrogen(H) bonding polymer systems in the melts : random copolymer of vinly acetate and vinyl alcohol, P(VAc-VOH). Stress growth function of this system showed the shear thinning behavior successively to the stress overshoot. This result suggests that H-bonding structure break up under steady shear flow. However, RHEO-ATR-FTIR measurements on the same sample revealed that the number of hydrogen bonds did not change by applying flow fields. This result suggested two possibilities : small change in the number of H-bonds and/ or the structural change from inter-to intra-molecular H-bonds will be responsible for the shear thinning behavior.

我们进行了线性和非衬里的流变学测量以及在熔融中的氢（H）键合聚合物系统的剪切流下进行FTIR测量：Vinly乙酸盐和乙烯基醇的随机共聚物，P（vac-voh）。该系统的应力生长函数表明，剪切稀薄的行为依次与压力过冲。该结果表明，H键结构在稳定的剪切流下破裂。但是，同一样品上的Rheo-ATR-FTIR测量结果表明，氢键的数量不会通过应用流场而变化。该结果提出了两种可能性：H键的数量和/或从分子内H键的结构变化的小变化将负责剪切稀薄行为。