Acta Phys. -Chim. Sin. ›› 1992, Vol. 8 ›› Issue (03): 370-375.doi: 10.3866/PKU.WHXB19920316

• ARTICLE • Previous Articles     Next Articles

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

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