液晶嵌段共聚物PEG-b-近晶polymer在纯态和稀溶液中的自组装
Self-assembly of liquid crystal block copolymer PEG-b-smectic polymer in pure state and in dilute aqueous solution
摘要：
合成并表征了一系列疏水嵌段为近晶聚合物聚（4-甲氧基苯基4-（6-丙烯酰氧基-己氧基）-苯甲酸酯）（PA 6酯1），亲水嵌段为聚乙二醇（PEG）的两亲性液晶嵌段共聚物。详细研究了其中一种分子在纯态和稀水溶液中的自组装行为。利用小角X射线散射（SAXS）和广角X射线散射（WAXS）研究了纯态样品在磁场作用下的纳米结构。观察到六方圆柱形的微观偏析相，晶格间距为11.2 nm。PEG嵌段在圆柱体中，而近晶聚合物嵌段形成层间距为2.4 nm且层法线平行于圆柱体长轴的基质。如低温TEM所示，在水中形成有小平面的单层聚合物囊泡，聚合物囊泡。在这些聚合物囊泡的溶致双层膜中，疏水嵌段中的热致近晶顺序清晰可见，层法线平行于膜表面。
英文摘要：
A series of amphiphilic LC block copolymers, in which the hydrophobic block is a smectic polymer poly(4-methoxyphenyl 4-(6-acryloyloxy-hexyloxy)-benzoate) (PA6ester1) and the hydrophilic block is polyethyleneglycol (PEG), were synthesized and characterized. The self-assembly of one of them in both the pure state and the dilute aqueous solution was investigated in detail. Nano-structures in the pure state were studied by SAXS and WAXS on samples aligned by a magnetic field. A hexagonal cylindrical micro-segregation phase was observed with a lattice distance of 11.2 nm. The PEG blocks are in the cylinder, while the smectic polymer blocks form a matrix with layer spacing 2.4 nm and layer normal parallel to the long axis of the cylinders. Faceted unilamellar polymer vesicles, polymersomes, were formed in water, as revealed by cryo-TEM. In the lyotropic bilayer membrane of these polymersomes, the thermotropic smectic order in the hydrophobic block is clearly visible with layer normal parallel to the membrane surface.
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