Research Article
Tunable Thin Film Periodicities by Controlling the Orientation of Cylindrical Domains in Side Chain Liquid Crystalline Block Copolymers
Table 1
Characterization data of the synthesized BCPs.
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aThe labels SG and S(X)F refer to PS-b-PGMA and PS-b-PXFMA, respectively, while the number to the right refers to the number-average molecular weight (Mn) of the polymer. bMn and dispersities (Đ) were obtained by SEC using THF as the eluent based on PS standards. cPS weight fractions (wPS) of PS-b-PGMA were calculated via 1H NMR and PS weight (wPS) and volume fractions (fPS) of PS-b-PXFMA were further estimated based on 100% introduction rate of side chain using bulk densities for each block (1.05 g cm−3 for PS, 0.805 g cm−3 for PGMA, 1.43 g cm−3 for P1FMA, 1.45 g cm−3 for P4FMA, 1.66 g cm−3 for P6FMA and 1.73 g cm−3 for P8FMA). dThe domain spacings (d-spacing) were estimated from the position of first-order scattering peak in the SAXS profile upon thermal annealing at 150°C for 24 h. eThe periodicity of LC side chain was determined by the position of first-order scattering peak in the WAXD profile of homopolymer upon thermal annealing at 150°C for 24 h. fThe bulk morphologies were determined by SAXS and TEM. |