Electric Field Effects on Polymer Alloys

9521265 Krause该项目是基于PI最近的工作，表明电场可用于生产具有独特形态的相分离聚合物合金。 在电场中的薄膜流延允许生产包含球形和椭圆形次要相的样品，这些次要相在电场方向上形成“珍珠链”，嵌段共聚物与均聚物的混合物中的独特形态，以及半结晶次要相的取向线。 PI现在将研究：离子嵌段共聚物材料的变形（机电材料）;理论处理，包括共存相之间小离子迁移的影响以及电场中相关分裂的相位失真的时间依赖性;观察当聚合物在另一种聚合物的单体中的溶液时获得的相位失真允许在电场中聚合;溶液中的细长固体颗粒作为频率的函数，在AC场中，试图观察取向的突然变化;在一些各向异性共混物中的介电常数的各向异性。 这些研究应导致有关的基础知识与电场，直流和交流的非均相系统的相互作用，并在一些潜在的有用的材料，利用非均相聚合物材料和电场。 ***

9521265 Krause This project is based on recent work by the PIs showing that electric fields can be used to produce phase-separated polymer alloys with unique morphologies. Film casting in electric fields has allowed the production of samples containing spherical and ellipsoidal minor phases that form "pearl chains" in the electric field direction, unique morphologies in mixtures of block copolymers with homopolymers, and oriented threads of semicrystalline minor phases. The PIs will now study: deformations of ionic block copolymer materials (electromechanical materials); theoretical treatments that include the effects of small ion migration between the coexisting phases and the time dependence of phase distortion with associated breakup in an electric field; observation of phase distortions obtained when a solution of a polymer in the monomer of another polymer is allowed to polymerize in an electric field; elongated solid particles in solution as a function of frequency in an AC field in an attempt to observe abrupt changes in orientation; the anisotropy of dielectric constant in some anisotropic blends. %%% These studies should result in fundamental knowledge concerning the interaction of heterogeneous systems with an electric field, both DC and AC, and in some potentially useful materials which utilize heterogeneous polymeric materials and electric fields. ***