KEU/VTHEAB/St阴离子蠕虫状胶束的制备及流变性能
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摘要
为探讨疏水单体对蠕虫状胶束聚合前后流变性能的影响,以芥酸钾(KEU)为主剂,分别选择苄基三甲基氯化铵(BTAC)、对乙烯基三羟乙基苄基氯化铵(VTHEAB)为助水溶物,St为增溶单体,制备阴离子型可聚合蠕虫状胶束.利用表观黏度考察了St增溶对聚合后KEU/BTAC/St及KEU/VTHEAB/St体系表观黏度(ηa)的影响,并对聚合前后胶束溶液的流变性能进行探讨.结果表明,VTHEAB与KEU的最优摩尔浓度配比为0.89∶1,KEU/BTAC/St及KEU/VTHEAB/St体系中,St最佳增溶量分别为0.12g,0.18g.67℃开始升温至101℃,170/s剪切速率下连续剪切60min后,KEU/BTAC体系及KEU/BTAC/St聚合后体系的ηa分别为24mPa·s,49.7mPa·s;相同条件下连续剪切70min后,KEU/VTHEAB体系及KEU/VTHEAB/St聚合后体系的ηa分别为29.8mPa·s,76.5mPa·s.KEU/VTHEAB/St聚合体系的剪切稳定性优越,归因于该体系中不仅存在胶束疏水内核中的St聚合物链,且存在胶束外壳中VTHEAB聚合物链和核壳间St-VTHEAB共聚物链,由此推断这些聚合物链对胶束的微结构产生了"lock-in"效应.
In order to investigate the effect of hydrophobic monomer on the rheological properties of wormlike micelle before and after polymerization,anionic polymerizable wormlike micelles(WLMs)were formed in aqueous solutions of potassium erucate(KEU)as main agent,benzyltrimethylammonium chloride(BTAC)and 4-styrene benzyltrihydroxyethyl ammonium chloride(VTHEAB)as hydrotropic salt respectively,styrene as hydrophobic monomer.The effect of St solubilization on theηaof systems the KEU/BTAC/St and KEU/VTHEAB/St after polymerization was investigated by apparent viscosity method,then the rheological properties of micellar solution before and after polymerization were discussed by rheological method.The results show that the optimal molar concentration ratio of VTHEAB to KEU is 0.89∶1,and the optimum solubilization quantity of St for KEU/BTAC/St and KEU/VTHEAB/St system is 0.12 g and 0.18 g respectively.Theηaof KEU/BTAC system and KEU/BTAC/St polymerization system is 24 mPa·s and 49.7 mPa·s respectively after shearing 60 mins under170/s shear rate starting raising temperature from 67℃to 101℃.Under the same condition,shearing 70 mins continuously,theηaof KEU/VTHEAB system and KEU/VTHEAB/St polymerization system is 29.8mPa·s and 76.5mPa·s respectively.Based on the above discussion,the superior shear stability of KEU/VTHEAB/St polymerization system may attribute to the St polymer chains in micellar hydrophobic core and VTHEAB polymer chains in micellar shell as well as the St-VTHEAB copolymer chains in the core-shell structure.The"lock-in"of the microstructure of wormlike micelles is formed by all these polymer chains.
In order to investigate the effect of hydrophobic monomer on the rheological properties of wormlike micelle before and after polymerization,anionic polymerizable wormlike micelles(WLMs)were formed in aqueous solutions of potassium erucate(KEU)as main agent,benzyltrimethylammonium chloride(BTAC)and 4-styrene benzyltrihydroxyethyl ammonium chloride(VTHEAB)as hydrotropic salt respectively,styrene as hydrophobic monomer.The effect of St solubilization on theηaof systems the KEU/BTAC/St and KEU/VTHEAB/St after polymerization was investigated by apparent viscosity method,then the rheological properties of micellar solution before and after polymerization were discussed by rheological method.The results show that the optimal molar concentration ratio of VTHEAB to KEU is 0.89∶1,and the optimum solubilization quantity of St for KEU/BTAC/St and KEU/VTHEAB/St system is 0.12 g and 0.18 g respectively.Theηaof KEU/BTAC system and KEU/BTAC/St polymerization system is 24 mPa·s and 49.7 mPa·s respectively after shearing 60 mins under170/s shear rate starting raising temperature from 67℃to 101℃.Under the same condition,shearing 70 mins continuously,theηaof KEU/VTHEAB system and KEU/VTHEAB/St polymerization system is 29.8mPa·s and 76.5mPa·s respectively.Based on the above discussion,the superior shear stability of KEU/VTHEAB/St polymerization system may attribute to the St polymer chains in micellar hydrophobic core and VTHEAB polymer chains in micellar shell as well as the St-VTHEAB copolymer chains in the core-shell structure.The"lock-in"of the microstructure of wormlike micelles is formed by all these polymer chains.
引文
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[4]刘朋飞,范雅珺,梁兵.两端疏水聚丙烯酰胺的合成及疏水缔合性能[J].油田化学,2017,34(4):668-673.LIU P F,FAN Y J,LIANG B.Synthesis of hydrophobically both end-capped polyacrylamide and associative property[J].Oilfield Chemistry,2017,34(4):668-673.(in Chinese)
[5]穆瑞花,狄育慧,余丽丽,等.阳离子表面活性单体DMOAB的制备及性能[J].纺织高校基础科学学报,2017,30(1):102-106.MU R H,DI Y H,YU L L,et al.Preparation and properties of cationic surface-active monomer DMOAB[J].Basic Sciences Journal of Textile Universities,2017,30(1):102-106.(in Chinese)
[6] MARTIEL I,SAGALOWICZ L,MEZZENGA R.Viscoelasticity and interface bending properties of lecithin reverse wormlike micelles studied by diffusive wave spectroscopy in hydrophobic environment[J].Langmuir,2014,30(35):10751-10759.
[7] HAN Y X,ZHOU H,WEI Y Q,et al.Effect of TBAB/KCl on constructing anionic wormlike micelles[J].Acta Physico-Chimica Sinica,2015,31(11):2124-2130.
[8] HE Z M,YUE L,WANG Y Q,et al.The rheological properties of wormlike micelles formed by cetyltrimethyl ammonium bromide and sodium oleate[J].Chemistry,2015,78(8):710-716.
[9] BI Y H,WEI H T,HU Q Z,et al.Wormlike micelles with photoresponsive viscoelastic behavior formed by surface active ionic liquid/azobenzene derivative mixed solution[J].Langmuir,2015,31(13):3789-3798.
[10] SHIBAEV A V,MOLCHANOV V S,PHILIPPOVA O E.Rheological behavior of oil-swollen wormlike surfactant micelles[J].The Journal of Physical Chemistry B,2015,119(52):15938-15946.
[11] ZHAO W R,DONG S L,HAO J C.Colloidal wormlike micelles with highly ferromagnetic properties[J].Langmuir,2015,31(41):11243-11248.
[12] SHRESTHA R G,SHRESTHA L K,MATSUNAGA T,et al.Lipophilic tail architecture and molecular structure of neutralizing agent for the controlled rheology of viscoelastic fluid in amino acid-based unionic surfactant system[J].Langmuir,2011,27(6):2229-2236.
[13] ZHU Z Y,GONZALEZ Y I,XU H X,et al.Polymerization of anionic wormlile micelles[J].Langmuir,2006,22(3):949-955.