含不同金属离子的EPDM磺酸盐离聚物的研究

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。

离聚体溶液粘度方程

Huggins equation has been found not suitable for the ionomer solution because of the aggregation of polymer chains. In this paper a viscosity equation for describing the viscometric behavior of ionomer solution is proposed as follows:where A, κ and γ are adjustable parameters. Two kinds of zinc sulfonated butyl rubber (Zn-SIIR) ionomers with different molecular weight ([η]=0.65 and 1.47dL·g-1, xylene, 25 ℃) have been synthesized. Viscosity measurements for the ionomers in xylene containing various amount of hexanol (0～0.2mol·L-1) as cosolvent have been done. It has been found that ln(ηSP/c) increases linerly whit cγ for all plots and the liner correlative coefficients (R) are all higher than 0.999, indicating that viscosity concentration relationship for these ionomer solutions is in accordance with the viscosity equation mentioned above.The value of γ increases as hexanol content decreases. Science lower hexanol content leads to higher degree of aggregation of polymer chains, it is suggested that γ was related to the aggregation of polymer chains.

EPDM磺酸盐离聚体溶液粘度行为的研究

考察了在二甲苯-正已醇混合溶剂中,含不同金属离子Li^+、Na^+、K^+和Mg^(2+)、Ca^(2+)、Ba^(2+)的六种乙丙三元共聚物(EPDM)磺酸盐离聚体,比浓粘度与溶液浓度、温度及极性共溶剂含量的关系,认为各种金属盐的差异主要是由于溶液中金属离子与SO_3^-之间的相互作用造成的.

无规离聚体/非极性溶剂体系的溶液行为

介绍了无规离聚体／非极性溶剂体系的溶液行为，以及溶液的浓度、离子含量、离聚体的母体聚合物的分子量、平衡离子的性质、中和度、小分子盐和溶剂极性对这一行为的影响，并阐明该体系的溶液行为在本质上是由于离子对的偶极吸引作用而产生的分子内和分子间的离子聚集行为。