Viscoelastic solution of long polyoxyethylene chain phytosterol/monoglyceride/water systems
Viscoelastic solution of long polyoxyethylene chain phytosterol/monoglyceride/water systems
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DOI：
10.1007/s00396-009-2135-8
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发表时间：
2010-02
影响因子：
2.4
通讯作者：
Suraj Sharma;L. Shrestha;K. Sakai;H. Sakai;M. Abe
中科院分区：
文献类型：
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作者：
Suraj Sharma;L. Shrestha;K. Sakai;H. Sakai;M. Abe
我们研究了混合长聚氧乙烯链植物甾醇（PhyEO30）和单甘油酯（单月金醇（ML）或单棕榈醇（MP））表面活性剂在水体系中的流变学和结构。ML和MP在常温下均不溶于10% phyeo30溶液，但其溶解度随温度升高而增加，并在较高温度下形成各向同性溶液。当ML或MP在PhyEO30胶束溶液中溶解时，粘度随温度的变化最大。随着温度的升高，由于单甘油酯含量较高，粘度迅速增加，形成粘弹性溶液。粘弹性溶液的振荡流变行为可以用麦克斯韦模型在低频区描述，这是典型的缠结虫状胶束模式。当温度连续升高时，粘度降低，最终发生相分离。进行了小角度x射线散射测量，为流变数据提供了支持的结构证据。
We have studied the rheology and structure of a mixed long polyoxyethylene chain phytosterol (PhyEO30) and monoglyceride (monolaurin (ML) or monopalmitin (MP)) surfactants in an aqueous system. Both ML and MP are insoluble in 10 wt.% PhyEO30solution at normal room temperature, but their solubility is found to increase with the rise of temperature and an isotropic solution is formed at higher temperature. A maximum viscosity as a function of temperature appears as ML or MP is solubilized in the micellar solution of PhyEO30. With increasing temperature, viscosity increases rapidly for higher monoglyceride content and forms viscoelastic solution. The oscillatory rheological behavior of the viscoelastic solution can be described by Maxwell model at low-frequency region, which is the typical pattern of entangled wormlike micelles. Upon successive increase in temperature, the viscosity decreases and ultimately a phase separation occurs. Small-angle X-ray scattering measurements were performed to provide a supportive structural evidence for the rheological data.