物理化学学报 >> 1995, Vol. 11 >> Issue (07): 607-611.doi: 10.3866/PKU.WHXB19950708

研究论文 上一篇    下一篇

磺化丁基橡胶离聚体在混合溶剂中的聚集行为

曾兆华,冯克,李卓美   

  1. 中山大学高分子研究所|广州 510275
  • 收稿日期:1994-06-27 修回日期:1994-10-24 发布日期:1995-07-15
  • 通讯作者: 曾兆华

Aggregation Behavior of Sulfonated Butyl Rubber Ionomers in Mixed Solvents

Zeng Zhao-Hua,Feng Ke,Li Zhuo-Mei   

  1. Institute of Polymer Science,Zhongshan University,Guangzhou 510275
  • Received:1994-06-27 Revised:1994-10-24 Published:1995-07-15
  • Contact: Zeng Zhao-Hua

摘要:

用顺磁共振(ESR)谱和粘度法考察了磺化丁基橡胶离聚体在二甲苯/正己醇混合溶剂中的聚集行为.ESR谱表明离聚体的离子基团发生聚集,其聚集程度受极性共溶剂(正己醇)的影响.粘度考察表明,在不同的浓度时离子基团有不同的聚集形式,低浓度时以分子内聚集为主,高浓度时以分子间聚集为主.离聚体的聚集度(DA)与浓度(c)的关系可用经验式DA=Aexp(kc2)表示,其中A、k为常数.k值反映聚集度受浓度影响的程度,醇含量增大时k值减小,这是因为醇对离子的溶剂化作用导致离子聚集的倾向减小.

关键词: 离聚体, 丁基橡胶, 比浓粘度, 聚集度

Abstract:

ESR spectra and viscosity measurement have been used to study the aggregation behavior of two kinds of sulfonated butyl rubber ionomers. It was found that at low concentration, intramolecular aggregation occurred, resulting in a lower reduced viscosity, and at high concentration, intermolecular aggregation occurred, resulting in a higher reduced viscosity. The degree of aggregation (DA) can be expressed as a function of ionomer concentration by an empirical equation, DA=Aexp(kc2). The constant k related to tendency of aggregation of ionic groups. It was found that the value of k decreased with increasing hexanol content, indicating that the hexanol-solvation of the ionic groups could weaken the tendency of the ionic aggregation.

Key words: Ionomer, Butyl rubber, Reduced viscosity, Degree of aggregation