物理化学学报 >> 1992, Vol. 8 >> Issue (03): 370-375.doi: 10.3866/PKU.WHXB19920316

研究论文 上一篇    下一篇

含不同金属离子的EPDM磺酸盐离聚物的研究

冯克; 曾兆华; 李卓美   

  1. 中山大学高分子研究所,广州 510275
  • 收稿日期:1991-01-28 修回日期:1991-09-02 发布日期:1992-06-15
  • 通讯作者: 冯克

Study on Sulfonated EPDM Ionomers Containing Various Ions

Feng Ke; Zeng Zhao-Hua; Li Zhuo-Mei   

  1. Institute of Polymer Science, Zhongshan University, Guangzhou 510275
  • Received:1991-01-28 Revised:1991-09-02 Published:1992-06-15
  • Contact: Feng Ke

摘要: 合成了含不同金属离子Na~+、Mg~(2+)、Zn~(2+)和Al~(3+)的四种乙丙三元共聚物(EPDM)磺酸盐离聚物, 红外光谱和氧瓶燃烧法测定了磺酸基的存在和含量。动态力学结果表明, 离聚物中碳酸盐基团可能以多重离子对形式聚集; 热重法指出, EPDM磺酸盐的热稳定性为钠盐>锌盐>镁盐>铝盐。考察了它们在二甲苯-正己醇混合溶剂中, 比浓粘度随浓度、温度变化的规律, 初步分析了各种金属盐的差异及其原因。

关键词: 离聚物, EPDM磺酸盐, 热稳定性, 溶液粘度行为

Abstract: Sulfonated EPDM ionomers containing Na~+, Mg~(2+), Zn~(2+) and Al~(3+) have been synthesized and identified with IR spectra. Dynamic mechanical analyses showed that the ionic groups in ionomers have been aggregated to mutiplets instead of clusters. Ther-mogravimetry showed that the thermal stability of the ionomers is in an order as Na>Zn>Mg>Al.
Viscometric behaviors of ionomers in xylene-5% hexanol mixed solvent are quite different from that of EPDM owing to the interaction between ionic groups. The strength of interaction of metallic ions with -SO_3~- is in the order Na>Mg>Zn. This fact was interpreted by considering the different hexanol-solvation ability of different metallic ions and the stability of the solvation layer around them.

Key words: Ionomers, Sulfonated EPDM metallic salts, Thermal stability, Viscometrie behavior in solution