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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 (DSC) and small angle X-ray diffraction (SAXD) techniques were used to characterize the complex of polyoxyethylene sorbitan fatty acid esters, sorbitan fatty acid esters, linear fatty alcohols and volatile The phase transition properties of the layered liquid crystalline system were determined. The order-disorder transition temperatures of the oil-in-water and oil-in-water spherical onion lamellar liquid crystals LO1 and LO2 and the planar lamellar liquid crystals Lβ were determined. relationship. The results show that octadecyl alcohol plays an important role in stabilizing the liquid crystal phase. When the mass ratio of the mixed emulsifier to fatty alcohol is 1: 1, the spherical laminar liquid crystal is the most stable. Decreasing this ratio results in the appearance of a phase of octadecyl alcohol in which the plane laminar liquid crystal and the spherical laminar liquid coexist and are free. The difference in the phase transition temperatures of the spherical and planar lamellar liquid crystals indicates that these phases have different compositions. Decreasing the polarity of the oil phase broadens the phase transition temperature of the L [beta] plane phase and increases the diversity of the LC phase.