聚合物P(NaAMPS-VCL-DVB)分子结构对其温敏缔合行为的影响
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摘要
采用可见分光光度计、变温核磁共振氢谱、流变仪等,从浊点和黏度变化方面研究了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)聚合物PAVD在水溶液中的温敏缔合作用,揭示了PAVD分子结构对其温敏缔合作用的影响规律。可见分光光度计和变温核磁共振氢谱对PAVD水溶液相变过程的跟踪研究表明,聚合物分子中VCL含量越高,浊点越低,且变温核磁共振氢谱测试表明,PAVD分子VCL侧链上亚甲基链段会随着温度的升高而变为疏水性,进而产生疏水缔合作用;流变测试表明,只有当聚合物分子中VCL含量处于一定范围内时,其溶液会出现明显的温敏增稠现象,且VCL含量越高,临界增稠温度越低,温敏增稠现象越显著。最后基于临界增稠温度和浊点的对比分析,对聚合物水溶液的温敏缔合过程进行探讨。
Temperature-sensitive association behavior of polymer PAVD of sodium 2-acrylamido-2-methylpropane sulphonate(NaAMPS),N-vinylcaprolactam(VCL)and divinyl benzene(DVB)in aqueous solution was investigated by visible spectrophotometer,variable-temperature 1 H-NMR and rheometer from cloud point and viscosity changes.The influence of molecular structure of PAVD on temperature-sensitive association was revealed.The results from monitoring phase change process by visible spectrophotometer and variable-temperature 1 H-NMR show that the higher the VCL content,the lower the cloud point.The results from variable-temperature 1 H-NMR also show that as temperature rises,methylene segments of VCL side chain in PAVD become hydrophobic,producing hydrophobic association.The rheological tests show that only when the VCL content in PAVD is within a certain range,it would appear obvious thermosensitive thickening phenomenon.The higher the VCL content,the lower the critical thickening temperature,and temperature-sensitive thickening phenomenon is more significant.The thermosensitive association phenomenon was analysed by comparative analysis of the critical thickening temperature and lower critical solution temperature(LCST).
Temperature-sensitive association behavior of polymer PAVD of sodium 2-acrylamido-2-methylpropane sulphonate(NaAMPS),N-vinylcaprolactam(VCL)and divinyl benzene(DVB)in aqueous solution was investigated by visible spectrophotometer,variable-temperature 1 H-NMR and rheometer from cloud point and viscosity changes.The influence of molecular structure of PAVD on temperature-sensitive association was revealed.The results from monitoring phase change process by visible spectrophotometer and variable-temperature 1 H-NMR show that the higher the VCL content,the lower the cloud point.The results from variable-temperature 1 H-NMR also show that as temperature rises,methylene segments of VCL side chain in PAVD become hydrophobic,producing hydrophobic association.The rheological tests show that only when the VCL content in PAVD is within a certain range,it would appear obvious thermosensitive thickening phenomenon.The higher the VCL content,the lower the critical thickening temperature,and temperature-sensitive thickening phenomenon is more significant.The thermosensitive association phenomenon was analysed by comparative analysis of the critical thickening temperature and lower critical solution temperature(LCST).
引文
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[3]Wang Y,Feng Y J,Wang B Q,et al.A novel thermoviscosifying water-soluble polymer:Synthesis and aqueous solution properties[J].J.Appl.Polym.Sci.2010,116:3516-3524.
[4]Chen Q S,Wang Y,Lu Z Y,et al.Thermoviscosifying polymer used for enhanced oil recovery:rheological behaviors and core flooding test[J].Polym.Bull.,2013,70:391-401.
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[8]Petit L,Karakasyan C,Pantoustier N,et al.Synthesis of graft polyacrylamide with responsive self-assembling properties in aqueous media[J].Polymer,2007,48:7098-7112.
[9]Lozinsky V I,Simenel I A,Kulakova V K.Synthesis and studies of N-vinylcaprolactam/N-vinylimidazole copolymers that exhibit the“proteinlike”behavior in aqueous media[J].Macromolecules,2003,36:7308-7323.
[10]Andersson M,Maunu S L.Volume phase transition and structure of poly(N-isopropylacrylamide)microgels studied with 1 HNMR spectroscopy in D2O[J].Colloid Polym.Sci.,2007,285:293-303.
[11]Tizzotti M,Creuzet C,Labeau M,et al.Synthesis of temperature responsive biohybrid guar-based grafted copolymers by click chemistry[J].Macromolecules,2010,43:6843-6852.
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