N-苄基-N-正丁基丙烯酰胺三元共聚物与SDS的相互作用

摘要

Mixed aggregates of hydrophobically association amphiphilic polymer and surfactant can be formed in solutions and thus can change the properties of the mixed solutions dramatically.A hydrophobically association amphiphilic polymer Poly (acrylamide-sodium acrylate-N-benzyl-N-butyl acrylamide) copolymer was synthesized utilizing radical micellar copolymerization and its structure was characterized by FT-IR spectroscopy.Fluorescent probe,viscosity and rheology method were used to study the interaction of P(AM-NaA-BBAM) and SDS.The mechanism of action between P(AM-NaA-BBAM) and SDS was discussed.The results show that at low concentration of SDS,mixed aggregates of P(AM-NaA-BBAM) and SDS can be formed which can enhance the association strength of hydrophobic groups,as well as the apparent viscosity of the mixed solution and the viscoelasticity.The polymer's net-structure is broken down because of solubalization of partially hydrophobic groups into the excess surfactant micelles.Thus,the effective cross-linking between polymer chains is prevented.The association strength of hydrophobic groups,the viscosity and the viscoelasticity of the mixed solution decrease.%两亲聚合物与表面活性剂在溶液中能形成聚合物/表面活性剂复合物从而引起溶液性质发生重大变化.通过自由基胶束共聚法制备疏水单体为N-苄基-N-正丁基丙烯酰胺(BBAM)的三元共聚两亲聚合物P(AM-NaA-BBAM),并采用FT-IR进行结构表征.采用荧光探针法、黏度法、流变法研究P(AM-NaA-BBAM)与十二烷基磺酸钠(SDS)的相互作用,分析二者的相互作用机制.结果表明:SDS质量浓度较低时,P(AM-NaA-BBAM)与SDS通过形成混合胶束提高P(AM-NaA-BBAM)/SDS混合体系中疏水基团的缔合强度以及混合溶液的表观黏度和弹性;SDS质量浓度较高时,部分疏水基团单独增溶于表面活性剂胶束中从而破坏溶液的空间网络结构,疏水基团的缔合强度降低,混合溶液表观黏度及弹性降低.