磺酸基共聚凝胶在有机溶剂中的溶胀特性

SWELLING BEHAVIOR OF COPOLYMERIZED GELS WITH SULFONIC ACID GROUPS IN ORGANIC SOLVENTS

以２－丙烯酰胺基－２－甲基丙磺酸（ＡＭＰＳ）与甲基丙烯酸－２－羟基丙酯（ＨＰＭ）为单体、Ｎ，Ｎ－亚甲基双丙烯酰胺（ＢＩＳ）为交联剂，合成了带磺酸基团的共聚强电解质凝胶，在纯水、乙醇、二甲基亚砜以及乙醇＼四氢呋喃混合溶剂中进行了溶胀实验。随凝胶中ＡＭＰＳ摩尔分数增加，凝胶在纯水、乙醇、二甲基亚砜中的溶胀比均增大；对同一凝胶试样，当乙醇＼四氢呋喃混合溶剂中四氢呋喃浓度增加则溶胀比减小；当ＢＩＳ用量由１．５ｍｏｌ％增加至３ｍｏｌ％时，溶胀比显著减小。结果表明，静电相互作用与交联密度是强电解质凝胶在有机溶剂中溶胀行为的决定因素。

olyelectrolyte gels with sulfonic acid groups were prepared in DMSO water mixture using 2(acrylamido)2methylpropanesulfonic acid (AMPS) and 2hydroxylpropyl methacrylate (HPM) as monomers with the crosslinker of N,Nmethylenebis(acrylamide) (BIS). The swelling ratios in water, dimethyl sulfoxide, and ethanol increase with the increase of AMPS mole fraction in the gel samples. Increasing the volume fraction of tetrahydrofuran (THF) in ethanol THF mixtures results in the decrease of the swelling ratio for a given gel. Swelling ratios rapidly diminish as the mole fraction of BIS in gels rises form 0.015 to 0.03. The results reveal that both electrostatic interaction and corsslink density dominate the swelling behavior for a strong polyelectrolyte gel in organic solvents.