作　　者： ; ;

机构地区： 华南理工大学材料科学与工程学院材料科学研究所

出　　处： 《功能高分子学报》 1993年第3期260-266,共7页

摘　　要： N,N-二甲基丙烯酰胺分别与2-丙烯酰胺-2-甲基丙磺酸或丙烯酸钠经自由基共聚,合成了聚电解质凝胶DS50和DA50,交联剂为N,N’-亚甲基双丙烯酰胺。比较了DS50与DA50在不同pH值的缓冲溶液和不同组成的水-丙酮混合溶液中的溶胀特性,并观察到两种凝胶在水-丙酮混合溶液中都会发生体积相变,在上述两类溶液中DS50的溶胀比都比DA50大。测定了未溶胀的DS50的动态贮能模量G′和损耗模量G″,发现G′不随应变和角频率变化,讨论了平衡剪切模量Ge与凝胶中分子链密度的关系。同时还发现,将DS50在纯水中溶胀平衡时的有关实验数据代入Flory的凝胶状态方程并不能得到合理的相互作用参数值。 Polyelectrolyte gel samples DS50 and DA50 were radically copolymerized respectively with ionizable monomers 2-acrylamido-2-methylpropane sulfonic acid and sodium acrylate together with comonomer N,N-dimethyl acrylamide and cross-linker N,N'-methylene-bis-(acrylamide). Swelling behavior of the two gels was investigated in buffer sollutions of different pH and in water+acetone mixtures, the volume phase transition occurring for the both samples in the mixtures. The storage modulus G' and loss modulus G' were measured on unswollen DS50, showing G' independent of the shear strain γ and angular frequency ω; and chain density in the gel was discussed with Ge, the equilibrated shear modulus obtained from G'. Finally, the data for DS50 swelling in water were introduced into Flory's equation of gel state, which cannot give a reasonalbe value of the interaction parameter Χ.

关 键 词： 高分子凝胶 溶胀平衡 体积相变

领　　域： [理学] [理学]