A betaine-type styrene monomer with the quaternary ammonium-borate anion inner-salt pair was synthesized through the quatemization reaction and polymerized to afford the target polybetaine of poly（4-vinylbenzyl methy...A betaine-type styrene monomer with the quaternary ammonium-borate anion inner-salt pair was synthesized through the quatemization reaction and polymerized to afford the target polybetaine of poly（4-vinylbenzyl methyl-diethanol ammonium borate） （PVMAB）. The chemical structures of the monomer and polymer were well demonstrated with 1H-NMR and llB-NMR spectra analysis. The thermal-sensitive experiment showed that PVMAB in water afforded gradually well- defined sigmoidal transmittance-temperature （T-t） curves along with the increasing polymer concentration. However, the phase transition temperatures at the bottom of the S-shaped curves were always below l0 ~C due to the very weak zwitterionic association of the ammonium-borate inner-salt pairs. The UCST phase transition could also be tuned by changing the ethanol content in the ethanol/water mixture. And the cytotoxicity experiment demonstrated the good biomimetic property of PVMAB. This study enriches the toolbox of polybetaines by introducing the quaternary ammonium- borate anion zwitterionic pair in the repeat units, therefore broadens the scope of synthetic polybetaines.展开更多
将十二烷基硫酸钠(K_(12))分别与脂肪醇聚氧乙烯醚9(AEO_9)和椰子油脂肪酸二乙醇酰胺(6501)这两种非离子表面活性剂按不同质量比复配,研究所得表面活性剂复配体系的临界胶束浓度(cmc)、表面张力(γ)和动态表面张力(DST).结果表明:当K12-...将十二烷基硫酸钠(K_(12))分别与脂肪醇聚氧乙烯醚9(AEO_9)和椰子油脂肪酸二乙醇酰胺(6501)这两种非离子表面活性剂按不同质量比复配,研究所得表面活性剂复配体系的临界胶束浓度(cmc)、表面张力(γ)和动态表面张力(DST).结果表明:当K12-AEO9和K12-6501复配体系质量比分别为1∶1和3∶7时,cmc值最小,分别为0.14 mmol·L^(-1)和0.30 mmol·L^(-1)),此时体系协同效应最好;当K12-AEO9复配体系质量比为1∶1时,平衡时间t*最小(1.42 s),表面张力降低速率R1/2最大(14.47 m N·m^(-1)·s^(-1)),此时体系动态表面活性最好;当K12-6501复配体系质量比为3∶7时,R1/2最大(14.25 m N·m^(-1)·s^(-1)),此时体系更易于达到介平衡态,动态表面活性最好.其规律是:随表面活性剂浓度的增加,两种复配体系在水表面达到吸附平衡的时间减小,表面张力降低速率增加.展开更多
基金financially supported by the National Natural Science Foundation of China(No.21374056)the Program for Changjiang Scholars and Innovative Research Team in Universities(IRT 14R33)+3 种基金the Natural Science Basic Research Plan in Shaanxi Province of China(NSBRP-SPC 2014JM2051)the Program of Introducing Talents of Discipline to Universities(B14041)Shaanxi Innovative Research Team for Key Science and Technology(2012KCT-21,2013KCT-17)the One Hundred Plan of Shaanxi Province
文摘A betaine-type styrene monomer with the quaternary ammonium-borate anion inner-salt pair was synthesized through the quatemization reaction and polymerized to afford the target polybetaine of poly（4-vinylbenzyl methyl-diethanol ammonium borate） （PVMAB）. The chemical structures of the monomer and polymer were well demonstrated with 1H-NMR and llB-NMR spectra analysis. The thermal-sensitive experiment showed that PVMAB in water afforded gradually well- defined sigmoidal transmittance-temperature （T-t） curves along with the increasing polymer concentration. However, the phase transition temperatures at the bottom of the S-shaped curves were always below l0 ~C due to the very weak zwitterionic association of the ammonium-borate inner-salt pairs. The UCST phase transition could also be tuned by changing the ethanol content in the ethanol/water mixture. And the cytotoxicity experiment demonstrated the good biomimetic property of PVMAB. This study enriches the toolbox of polybetaines by introducing the quaternary ammonium- borate anion zwitterionic pair in the repeat units, therefore broadens the scope of synthetic polybetaines.
文摘将十二烷基硫酸钠(K_(12))分别与脂肪醇聚氧乙烯醚9(AEO_9)和椰子油脂肪酸二乙醇酰胺(6501)这两种非离子表面活性剂按不同质量比复配,研究所得表面活性剂复配体系的临界胶束浓度(cmc)、表面张力(γ)和动态表面张力(DST).结果表明:当K12-AEO9和K12-6501复配体系质量比分别为1∶1和3∶7时,cmc值最小,分别为0.14 mmol·L^(-1)和0.30 mmol·L^(-1)),此时体系协同效应最好;当K12-AEO9复配体系质量比为1∶1时,平衡时间t*最小(1.42 s),表面张力降低速率R1/2最大(14.47 m N·m^(-1)·s^(-1)),此时体系动态表面活性最好;当K12-6501复配体系质量比为3∶7时,R1/2最大(14.25 m N·m^(-1)·s^(-1)),此时体系更易于达到介平衡态,动态表面活性最好.其规律是:随表面活性剂浓度的增加,两种复配体系在水表面达到吸附平衡的时间减小,表面张力降低速率增加.
