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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...
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