掺杂聚合物对溶致液晶结构的影响

利用聚合物大分子作构建组分，将其掺杂到不同类型表面活性剂构成的溶致液晶中，考察对液晶相结构的影响．利用小角X射线散射及偏光显微镜对聚合物掺杂前后液晶的结构进行表征，并讨论了聚合物与液晶模板间的相互作用．对阴离子型表面活性剂琥珀酸二异辛酯磺酸钠(AOT)／水液晶体系，聚合物的嵌入使层间距d增大；而对非离子表面活性剂十二烷基聚氧乙烯醚(C12EO4)／水体系，除小分子量的聚乙二醇PEG400外，其它聚合物嵌入使d减小，表明聚合物分子类型、大小及浓度对溶致液晶的结构参数甚至组装方式有不同的影响机制．

Effects of Doped Polymers on the Phase Behaviors of Lyotropic Liquid Crystals

Fabrication of polymer or polymer modified nanomaterials templated by lyotropic liquid crystals (LLC) is a promising way to obtain expected nanostructured functional materials. However, the structures of LLC are easy to be changed by environmental conditions. Therefore, investigation on interactions between polymers (or monomers) and LLC templates is significant for better controlling the structures and properties of nanomaterials. In this paper, polymers are doped into lyotropic lamellar liquid crystals formed with different types of surfactants. Effects of doped components on the phase behaviors of the lamellae are investigated in detail by small angle X ray scattering and polarized optical microscope. In LLC made of anionic surfactant, sodium bis(2 ethylhexyl) sulfosuccinate (AOT), and water, doped polymers induce a swelling lamellar phase and an increased periodic spacing. While in LLC made of nonionic surfactant, tetraethylene glycol monododecyl ether (C 12 EO 4), and water, polymer doping results in more orderly phase and a reduced interlayer spacing, with an exception of a low molecular weight polymer (PEG400). Results show that interactions between doped polymers and LLC vary with types and sizes of polymer molecules and also doping concentrations, which strongly influence the phase structures. Obtained results are helpful for designing suitable LLC templates and controlling the structures of expected nanomaterials.