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。
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 quitedifferent from that of EPDM owing to the interaction between ionic groups. The strengthof interaction of metallic ions with _-SO_3^- is in the order Na>Mg>Zn. This fact wasinterpreted by considering the different hexanol-solvation ability of different metallicions and the stability of the solvation layer around them.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1992年第3期370-375,共6页
Acta Physico-Chimica Sinica
基金
国家自然科学基金
中山大学科学研究基金
关键词
离聚物
EPDM磺酸盐
热稳定性
Ionomers
Sulfonated EPDM metallic salts
Thermal stability
Viscometric behavior in solution
