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Large-area continuous α phase thin films of monodisperse poly(9,9-dioctylfluorene) (PFO), with 32 or 64 fluorene repeating units, named as F32 or F64, respectively, are prepared by melt crystallization. A spherulite-like structure, composing of crystalline nanofibrils, is formed via radial growth after sufficient isothermal treatment. In these nanofibrils, the polymer chains remain extended conformation,...
A novel β′ phase crystal with lamellar structure of monodisperse poly(9,9-dioctylfluorene) (PFO) has been prepared by means of melt crystallization, demonstrating similar optical properties with β phase crystals. A preliminary determination of unit cell dimensions and molecular packing (orthorhombic, a = 1.30 nm, b = 2.22 nm, c = 3.36 nm, 4 chains, with space group Pmc2 1 and density 1.06 g/cm...
Lamellar crystals of polydisperse poly (9,9-di-n-octyl-2,7-fluorene)s were obtained from dilute solution. By means of scanning electron microscopy (SEM) and atomic force microscopy (AFM), we found that polymer chains formed lamellar single crystals through fractionated crystallization, in which components of the largest mass fraction crystallized first and remained extended in the first lamella. With...
Polymer single crystals of monodisperse poly (9,9-dioctylfluorene)s (PFOs) with actual molecular weights of 6220, 12,437 and 24,874 Da corresponding to the numbers of fluorene repeating units of 16, 32 and 64, respectively, were grown from chloroform/ethanol solutions. In the single crystals, polymer chains adopt lamellar packing motif. The crystal structure determined by electron diffraction is identical...
Polymer crystals of monodisperse poly (9,9-dioctylfluorene)s (PFOs, named as Fn) on mixing both components (F16 and F64) in different ratios are grown from chloroform/ethanol solutions. In these crystals, lamellar thicknesses corresponding to relevant components can be observed by utilizing atomic force microscopy (AFM). Crystallization of these polymers is accompanied by fractionated crystallization...
A series of novel donor–acceptor (D–A) liquid crystalline conjugated cooligomers, i.e. F3T4-epP, F4T6-epP and F5T8-epP, which comprise oligo(fluorene-alt-bithiophene)s (OFbTs) with the different lengths as the donor segments and a perylene diimide (PDI) derivative as the acceptor segment, were designed and synthesized. The cooligomers can form the films with the desired ideal morphology for bulk heterojunction...
We developed an approach, i.e. solvent-assist crystallization (SAC), for growing high quality single crystals of head-to-tail regio-regular poly(3-butylthiophene) (P3BT). By means of atomic force microscopy, electron diffraction and X-ray diffraction, we found that P3BT macromolecules formed lamella single crystals through gradient crystallization, and in the single crystals, molecules packed normal...
A liquid crystalline (LC) copolyether has been synthesized from 1-(4-hydroxy-4′-biphenyl)-2-(4-hydroxyphenyl)propane with 1,7-dibromoheptane and 1,11-dibromoundecane with a 50/50 (both in %) equal composition of the 7- and 11-methylene monomers [coTPP-7/11(5/5)]. A mono-domain with a homeotropic alignment can be induced by a thin film surface in the LC phase. When an electrostatic field is applied...
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