Melt Diffusion in Model Liquid-Crystalline Polymers

前向反冲光谱（FRES）将用于确定 相互扩散热致液体的浓度分布 结晶（LC）聚合物链。 合成的LC聚合物用于 这项研究将是氘代和非氘代LC 在普通溶剂中具有溶解度并受控的聚醚 分子量的 调查将集中在 可控分子量液晶聚合物的扩散行为 扩散到已知分子量的基质膜中。 LC聚合物链在其近晶、双晶和双晶中的扩散 将研究各向同性相。 程度的影响 在磁性或磁性介质中极化引起的链取向 电场也将探讨其对LC的影响 聚合物扩散特性 与其他组织的合作 科学家们将帮助描述这些 利用中子散射和流变学的热致聚合物 测量.

Forward recoil spectroscopy (FRES) will be used to determine the concentration profiles of interdiffusing thermotropic, liquid crystalline (LC) polymer chains. The LC polymers synthesized for this study will be both deuterated and nondeuterated LC polyethers with solubility in common solvents and controlled molecular weight. Investigations will concentrate on the diffusion behavior of LC polymers of controlled moleluclar weight diffusing into a matrix film of known molecular weight. Diffusion of LC polymer chains in their smectic, nematic, and isotropic phases will be studied. The effect of the degree of chain orientation induced by poling in either magnetic or electric fields will also be explored for its effect on the LC polymer diffusion characteristics. Collaborations with other scientists will help in the characterization of these thermotropic polymers using neutron scattering and rheological measurements.