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Effect of β-Cyclodextrin Upon the Sol-gel Transition of Methylcellulose Solutions in the Presence of Sodium Dodecyl Sulfate
Hua-yu Li1, Xiang Hao1, Yong-jun Xie1, Hai-yang Yang*1, He Liu2, Jian-hui Luo1
1.Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China;2.Research Institute of Science and Technology, China National Petroleum Corporation, Beijing 100083, China
Abstract:
The sol-gel transition temperature of methylcellulose (MC) solution in the presence of sodium dodecyl sulfate (SDS) as well as the mixtures of SDS and β-cyclodextrin (β-CD) was mea-sured, and the effect of the two competing interactions, the hydrophobic interaction between SDS and MC and the inclusion interaction between SDS and β-CD, upon the sol-gel transi-tion of MC solution was studied. It has been found that the inclusion interaction between SDS and β-CD is much greater than the hydrophobic interaction between SDS and MC. As a result, in the coexistence of SDS and β-CD, the sol-gel transition temperature of MC solution keeps the same value, independent of the concentration of SDS in solution on con-dition that the concentration of SDS is less than β-CD. Our experimental results not only suggest that the effect of SDS upon the sol-gel transition of MC solution can be screened by β-CD completely but also indicate the inclusion ratio of SDS to β-CD can be determined quantitatively by using rheological measurement. The inclusion ratio of SDS to β-CD is 1:1, which is in good agreement with the inclusion ratio of SDS to β-CD in the presence of poly(vincyl pyrrolidone) determined by the viscosity measurement but is critically different from the inclusion ratio of SDS to β-CD in the presence of the oppositely charged polyelec-trolyte by using the rheological measurement, mainly due to the reason that the mechanism of the interaction between SDS and MC is critically different from the mechanism of the interaction between SDS and the oppositely charged polyelectrolyte.
Key words:  Methylcellulose, Sodium dodecyl sulfate, β-CD, Sol-gel transition, Inclusion interaction
FundProject:
β-环糊精对含有十二烷基硫酸钠的甲基纤维素水溶液凝胶化行为的影响
李化玉1, 郝翔1, 谢永军1, 杨海洋*1, 刘合2, 罗建辉1
1.中国科学技术大学化学与材料科学学院高分子科学与工程系,合肥230026;2.中石油集团勘探开发研究院,北京100083
摘要:
测定了甲基纤维素在SDS溶液、和SDS与β-CD混合溶液中的凝胶化温度,讨论了SDS与MC之间疏水相互作用和SDS与β-CD之间包合作用对MC溶液凝胶化行为的影响. 结果表明,SDS与β-CD之间的包合作用远大于SDS与MC链上甲基之间疏水相互作用,在β-CD存在下,SDS对MC溶液凝胶化行为的影响可以被完全屏蔽掉. 由此可以进一步计算出在MC存在下SDS与β-CD之间的包合比是1:1,与在聚乙烯基吡咯烷酮存在下的包合比完全一致,但是与在带相反电荷聚电解质存在下的包合比并相同,主要是因为SDS与MC相互作用的方式和与聚电解质相互作用的方式有着本质的区别.
关键词:  甲基纤维素,十二烷基硫酸钠,β-环糊精,凝胶化转变,包合作用
DOI:10.1088/1674-0068/25/02/242-248
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