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- W2163671947 abstract "The uniaxial chain alignment and equatorial patterning of poly[9,9-bis(2-ethylhexyl)fluorene-2,7-diyl] (Mn= 29 kg/mol, Mw = 68 kg/mol) thin films atop rubbed polyimide substrates have been studied by grazing incidence X-ray diffraction. This specific molecular weight yields among the highest observed levels of chain alignment and optical anisotropy and, after thermal annealing, the sample undergoes transformation to a highly textured crystalline hexagonal phase. The two dominant equatorial orientations (i.e., types I and II crystallites) are found to have almost identical meridional orientation distributions. The X-ray deduced orientation is in quantitative agreement with that obtained by optical absorption measurements. It is also shown that the equatorial ordering is paracrystalline in nature, and both type I and type II crystallites are similar in this respect. This equatorial scattering is superimposed on a background of a hexagonal phase polymer with a cylindrically isotropic orientation (type III)." @default.
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- W2163671947 date "2007-08-11" @default.
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- W2163671947 title "Meridional Orientation in Biaxially Aligned Thin Films of Hairy-Rod Polyfluorene" @default.
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- W2163671947 doi "https://doi.org/10.1021/cg0607295" @default.
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