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通过丙烯酰胺(AM)和丙烯酰胺基十八羧酸钠(NaAAS)共聚合,在没有任何外加化学交联剂的情况下,分别在水溶液和十二烷基硫酸钠(SDS)溶液中通过自由基聚合制备了疏水缔合水凝胶,命名为HA凝胶和SHA凝胶.系统研究HA凝胶和SHA凝胶的机械拉伸性能发现,调节AM和NaAAS的含量,可以使SHA凝胶具有相较不含SDS的HA凝胶更好的力学拉伸性能.HA凝胶在水中不溶解且在纯化和溶胀过程中几乎没有损失,而SHA凝胶体系中的SDS可以扩散出凝胶网络溶解到水中,使得SHA凝胶表现出更加明显的溶胀-去溶胀-平衡溶胀行为;在盐水中由于疏水缔合得到加强,HA凝胶和SHA凝胶都表现出化学凝胶的溶胀特点.在常温下HA凝胶不能实现自愈合,而SHA凝胶具有较好的自愈合能力,并且自愈合效果可以通过SHA凝胶中SDS和聚合物固含量调节.
Copolymerization of acrylamide (AM) and sodium acrylamideoctadecyl carboxylate (NaAAS) was carried out in aqueous solution and sodium dodecyl sulfate (SDS) solution in the absence of any additional chemical cross-linking agent through free Hydrophobically associating hydrogels were prepared by radical polymerization, named as HA gels and SHA gels.Studying the mechanical tensile properties of HA gels and SHA gels, it was found that by adjusting the content of AM and NaAAS, The mechanical tensile properties are better than SDS-free HA gels, HA gels do not dissolve in water and have almost no loss during purification and swelling, whereas SDS in SHA gels can diffuse out of the gel network to dissolve Into the water, the SHA gel showed more obvious swelling-deswelling-equilibrium swelling behavior, the hydrophobic association in the brine was strengthened, the HA gel and the SHA gel showed the swelling characteristics of the chemical gel, Under HA gel can not achieve self-healing, while SHA gel has better self-healing ability, and the self-healing effect can be through SHA gel SDS and polymer solids content regulation.