Ordering, Graphoepitaxial Orientation, and Conformation of a Polyfluorene Derivative of the “Hairy-Rod” Type on an Oriented Substrate of Polyimide†

摘要: Spin-coated films of an ethylhexyl derivative polyfluorene can be converted on a pretreated polyimide substrate into highly oriented by annealing in the liquid crystalline state. Together with improving orientation segregation wormlike molecules respect to chain lengths and lamella formation proceeds. End groups are preferentially assembled interlamellar regions. This morphological feature is thought influence all measurements intrinsic properties similar histories. Electron diffraction patterns film identical X-ray fiber diagrams fibers drawn from melt annealed The experimental data show that polymer adopt helical (5/q) conformation, packing trigonal unit cell. Molecular modeling based ab initio MO calculations have been carried out obtain independent estimates geometry conformation. These more favor 5/2 rather than 5/1 hel...