温敏性微交联共聚物PAVD的溶液性能和微结构

以2-甲基-2-丙烯酰胺基丙磺酸钠(NaAMPS)、N-乙烯基己内酰胺(VCL)、二乙烯苯(DVB)为单体，采用胶束聚合法制备了温敏性微交联共聚物PAVD。采用FT IR、1H NMR和元素分析方法表征了该共聚物的分子结构，探讨了共聚物结构对其溶液性能的影响，且进一步分析了PAVD水溶液的温敏缔合过程。结果表明，在共聚物中同时引入交联单体DVB与疏水单体VCL后，适度的微交联结构与疏水基团的疏水缔合作用相互协同，赋予PAVD良好的增黏、耐温等性能，且具有温敏增稠特性，特别当PAVD共聚物分子中VCL单元数量较多，且溶液中PAVD达到一定浓度时；PAVD在水中形成了独特的网状结构，且在盐水中也能形成连续的缔合结构。

Solution Properties and Microstructure of Thermosensitive and Microcross-Linked Copolymer PAVD

Thermosensitive and microcross linked copolymer PAVD was synthesized by the micellar copolymerization technique with sodium 2-acrylamido-2-methylpropane sulphonate (NaAMPS), N-vinylcaprolactam(VCL) and divinyl benzene(DVB) as monomers. The structure of PAVD was characterized by FT-IR, ¹H-NMR and elemental analysis. The effects of copolymer structure on solution properties were investigated. The thermoassociative phenomenon of PAVD was further analyzed. The experimental results showed that the synergetic effect of measurable microcross-linked structure and hydrophobic association of hydrophobic groups resulted in excellent properties of the copolymer, such as better thickening ability, improved resistance to temperature and unique thermothickening properties after drawing the cross-linked structure and hydrophobic monomer into the molecule backbone, especially, when the number of VCL unit in PAVD molecule and the mass concentration of PAVD in aqueous solution were up to a certain value. Unique net structure was formed for PAVD molecules in water and also in brine solution.