Structure and rheology of direct and reverse liquid-crystal phases in a block copolymer/water/oil system
Structure and rheology of direct and reverse liquid-crystal phases in a block copolymer/water/oil system
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DOI：
10.1016/j.colsurfa.2005.06.061
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发表时间：
2005-11
期刊：
影响因子：
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通讯作者：
C. Rodríguez‐Abreu;Durga P. Acharya;K. Aramaki;H. Kunieda
中科院分区：
文献类型：
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作者：
C. Rodríguez‐Abreu;Durga P. Acharya;K. Aramaki;H. Kunieda
采用流变仪和小角X射线散射（SAXS）对单嵌段共聚物/油/水体系中正、反液晶相的流变性和微观结构进行了比较研究。反相的微观结构对温度的升高不太敏感，因为表面曲率的变化是有限的，而在直接相的情况下，有效表面积的减少促进了结构转变。所研究的六方相和胶束立方相在所使用的实验条件下显示出凝胶状行为，但胶束立方相的平台弹性模量的值高一个数量级。流变参数显示相同形态的反向和直接相的相同数量级的值，虽然直接相显示略高的弹性模量和复数粘度，可能反映了连续相的效果。在某些情况下，流变学和微观结构的变化之间的相关性被发现。
A comparative study on rheology and microstructure of direct and reverse liquid-crystal phases in a single-block copolymer/oil/water system using rheometry and small-angle X-ray scattering (SAXS) is presented. The microstructure of reverse phases is less sensitive to an increase in temperature, since changes in surface curvature are limited, whereas in the case of direct phase, a decrease in the effective surface area promotes structural transitions. The studied hexagonal and micellar cubic phases show gel-like behavior under the experimental conditions used, but the values of the plateau elastic modulus are one order the magnitude higher for micellar cubic phases. Rheological parameters show values of the same order of magnitude for reverse and direct phases of same morphology, although direct phases show slightly higher elastic modulus and complex viscosity, probably reflecting the effect of the continuous phase. In some cases, a correlation between rheology and microstructural changes was found.