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以2-丙烯酰胺-2-甲基丙磺酸(AMPS)为有机原料,正硅酸乙酯(TEOS)为无机原料,过硫酸钾为引发剂,N,N’-亚甲基双丙烯酰胺为交联剂,通过原位-凝胶水溶液聚合法合成了一系列不同二氧化硅含量和不同聚离子浓度的聚(2-丙烯酰胺-2-甲基丙磺酸)/二氧化硅杂化电场敏感性水凝胶.通过扫描电子显微镜(SEM)表征凝胶的结构,研究水凝胶在去离子水以及氯化钠溶液中的溶胀和消溶胀行为.结果表明,系列凝胶的平衡溶胀度介于224.9至325.6之间,复合凝胶的溶胀速率随TEOS用量的增加而降低;除理想杂化凝胶外,随着聚离子浓度的升高,凝胶在氯化钠溶液中的消溶胀速率逐渐减小.对凝胶的电场敏感性研究表明,当聚离子浓度大于氯化钠溶液浓度时,凝胶进一步溶胀,反之则消溶胀,其中杂化凝胶的再溶胀性能减弱,而消溶胀行为变得更为明显.同时制得的理想杂化凝胶,较纯有机凝胶具有更为理想的力学性能,最大抗压缩强度可达23.4 MPa.
Using 2-acrylamide-2-methylpropanesulfonic acid (AMPS) as organic material, tetraethyl orthosilicate (TEOS) as inorganic material, potassium persulfate as initiator and N, N’-methylenebisacrylamide As crosslinker, a series of poly (2-acrylamide-2-methylpropanesulfonic acid) / silica hybrids with different silica contents and different polyion concentrations were synthesized by in-situ aqueous gel polymerization Electric field-sensitive hydrogel.The structure of the gel was characterized by scanning electron microscopy (SEM) to study the swelling and deswelling behavior of the hydrogels in deionized water and sodium chloride solution.The results showed that the equilibrium gel swelling Degree ranged from 224.9 to 325.6. The swelling rate of the composite gel decreased with the increase of the amount of TEOS. In addition to the ideal hybrid gel, with the increase of polyion concentration, the swelling rate of the gel in sodium chloride solution The swelling rate decreases gradually.Study on the electric field sensitivity of the gel shows that when the concentration of polycation is greater than the concentration of sodium chloride solution, the gel will swell further, otherwise it will deswell, and the re-swelling property of the hybrid gel will weaken Swollen swelling behavior becomes more apparent.At the same time the ideal hybrid gel obtained, compared with pure organogel has more Ideal mechanical properties, the maximum compressive strength up to 23.4 MPa.