Liquid Crystalline Semifluorinated Block Copolymers: Probing Surface and Bulk Properties

9972863在拟议的研究中，将对一系列半氟化（SF） lc线圈嵌段共聚物的表面和体积特性进行研究。虽然半氟化基团作为介晶结构是非常规的，但它不仅具有液晶特性，而且具有非重构的低能量表面（接触角与水的接触角为120度）。本文将探讨液相结晶度与微相分离之间的竞争关系。计划中的研究将包括一个与详细结构分析紧密结合的合成程序，包括使用近边缘x射线吸收精细结构（NEXAFS）分析来探测表面区域的分子水平细节。最后，选择适当的保护基团化学用于生产目标SF侧基，将允许这些聚合物的表面图案与化学放大抗化学性。使用光刻技术来指导自组装过程将被检查作为控制表面能的手段，并探索作为影响LC相和微观结构的自组织的可能手段。对这些新型氟化聚四氟乙烯类材料的研究为创造具有分子水平表面结构控制的新型聚合物提供了可能性。从飞机防冰结构的不粘涂层到生物医学设备，这些聚合物具有广泛的应用前景。检查这些氟化聚合物也将导致更好地了解先进的微电子光刻胶。

9972863OberIn the proposed research, a study of the surface and bulk properties of a series of semifluorinated (SF) LC-coil block copolymers will be undertaken. While unconventional as mesogenic structures, semifluorinated groups provide not only liquid crystalline character but also non-reconstructing, low energy surfaces (contact angles vs. water 120 degrees). The competition between liquid crystallinity and microphase separation will be examined. The planned research will involve a synthetic program closely coupled to detailed structural analysis, including the use of near edge X-ray absorption fine structure (NEXAFS) analyses to probe molecular level details of the surface region. Finally, the choice of appropriate protecting group chemistry used for producing the target SF side groups will permit the surface patterning of these polymers with chemically amplified resist chemistry. The use of lithography to direct the self-assembly process will be examined both as means of controlling surface energy and explored as a possible means of influencing self-organization of the LC phases and the microstructure.Studies of these novel fluorinated, Teflon-like materials offer the possibility of creating new polymers with molecular level control of surface structure. These polymers have prospects in applications ranging from non-stick coatings for anti-icing structures on aircraft to biomedical devices. Examination of these fluorinated polymers will also lead to a better understanding of photoresists for advanced microelectronics.