Citation: Zhang Xiao-Hong, Fan Yu, Wu Shi-Kang. Effect of Sodium Dodecyl Sulfate on the Behavior of PEO-PPO-PEO Triblock Copolymer in Aqueous Solution[J]. Acta Physico-Chimica Sinica, 1999, 15(05): 390-397. doi: 10.3866/PKU.WHXB19990502
SDS对PEO-PPO-PEO嵌段共聚物溶液行为的影响
对PEO-PPO-PEO（127）三嵌段共聚物的水溶液行为及添加十二烷基硫酸钠（SDS）后对共聚物溶液行为的影响进行了研究．利用荧光探针技术对不同SDS浓度下F127／SDS体系的胶来形成进行研究，并研究了SDS对F127浓溶液凝胶化行为的影响．结果表明：随着SDS浓度的增大，F127稀溶液胶束的形成受到抑制，SDS浓度愈大，形成的胶束结构就愈疏松．对F127浓溶液来说，SDS与F127摩尔比小于2时，体系易于凝胶化；但当SDS浓度增大，其与F127摩尔比大于2时，体系开始难于凝胶化，直至摩尔比大于5时，体系不再形成凝胶．
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关键词:
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PEO-PPO-PEO三嵌段共聚物
- / 十二烷基硫酸钠(SDS)
- / 胶束
- / 凝胶化
English
Effect of Sodium Dodecyl Sulfate on the Behavior of PEO-PPO-PEO Triblock Copolymer in Aqueous Solution
The effect of the addition of sodium dodecyl sulfate (SDS ) upon the behavior of the F127 triblock copolymer solution has been studied in this work. The Process of F127 micelle formation in the copolymer solution with different concentration of SDS was monitored by fluorescence probe method. The gelation process of concentrated copolymer solution with different concentration of SDS was also measured. The results indicated that with increasing of SDS concentration in F127 solution, the process of micelle formation was inhibited and the structure formed became looser than that with no SDS added. For the concentrated solution of F127, if the molar ratio of SDS/F127 was less than 2 the system was gellable easily. But if the molar ratio was more than 2, the gelation process of solution was difficult to realize and it was impossible to form gel when the molar ratio was bigger than 5.
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Key words:
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PEO-PPO-PEO triblock copolymer
- / Sodium dodecyl sulfate(SDS)
- / Micelle
- / Gelation
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