层状液晶乳液的相行为  

Phase Behavior of Lamellar Liquid Crystal Emulsions

作　　者：李学静[1] Christian Quellet Claire Vautrin 田禾[3] 

机构地区：[1]上海奇华顿有限公司技术部,上海201203 [2]Givaudan DubendorfLtd Fragrance Research Dubendorf [3]华东理工大学化学与分子工程学院

出　　处：《应用化学》2006年第10期1150-1155,共6页Chinese Journal of Applied Chemistry

摘　　要：采用示差扫描量热法(DSC)和小角X射线衍射(SAXD)测试技术表征了由聚氧乙烯醚失水山梨糖醇脂肪酸酯、失水山梨糖醇脂肪酸酯、直链脂肪醇和挥发性物质组成的层状液晶体系的相转变特性,测定了水包油和油包水球形洋葱层状液晶LO1和LO2及平面层状液晶Lβ的有序-无序的转变温度与体系组成之间的关系。结果表明,十八醇在稳定液晶相中起重要作用,混合乳化剂与脂肪醇的质量比为1∶1时球形层状液晶最稳定。降低这一比例导致出现平面层状液晶与球形层状液晶共存和游离的十八醇的相。球形层状液晶与平面层状液晶的相转变温度的差别表明了这些相有不同的组成。降低油相的极性会使平面层状相Lβ的相转变温度范围变宽,同时也增加了液晶相的多样性。Differential Scanning Calorimetry and Small Angle X-ray Diffractometry were used to characterize the phase transitions in lamellar liquid crystal systems containing water, alkyl polyserbates, sorbitan esters, stearyl alcohol and oil. The order-disorder transition temperatures of the gelled O/W and W/O globular onion lamellar phases Lo1 and Lo2 and planar gelled lamellar phase Lβ were measured as a function of system compositions. The results confirm that stearyl alcohol plays an important role in stabilizing the liquid crystalline phases, and the optimal stabilization of the globular（onion） phase is obtained at a surfactant to alcohol ratio of 1 ： 1. Decreasing this ratio leads to the appearance of a planar phase coexisting with the onion phase and to a separate stearyl alcohol phase. The difference in transition temperature between the onion Lo and planar Lβ phases suggests that these phases have different compositions. Decreasing the polarity of the oil extends the melting range of the Lβ phases, but also increases the degree of heterogeneity of liquid crystal phase.

关 键 词：层状液晶(LLC) 相转变温度 示差扫描量热法(DSC) 小角X射线衍射(SAXD) 

分 类 号：O648.1[理学—物理化学] O647.2[理学—化学]