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• W2017863392 abstract "During the cold crystallization of poly(trimethylene terephthalate), PTT, multistage preordering activities associated with hierarchically structural evolution and origin of mesomorphic domains were investigated with time-resolved Fourier transform infrared (FTIR), photoluminescence (PL) and dielectric spectra (DS), and simultaneous small- and wide-angle X-ray scattering (SAXS/WAXS). The observed fluorescent emission at 390 nm and an absorption band at 874 cm−1 associated with the CH out-of-plane bending mode of the phenyl rings indicate that the ground-state dimers resulting from the phenyl rings of PTT chains via π–π interactions are formed in supercooled amorphous liquids. The time dependences of the increase of the fluorescent intensities, the wavenumber shift from 874 to 872 cm−1, the conformational transformation of the trimethylene glycol units from trans to gauche, the dynamic α-to-α′ transition of the dielectric loss and the structural parameters reveal that the dimer aggregation accompanying a locally nematic-like orientation induced large phase-separated mesomorphic domains (over several tens of nanometers); nucleations of nanograin type (over several nm) subsequently formed within the mesomorphic domains after the conformational transformation form trans to gauche for the cold crystallization at 50 °C. Herein, we propose a preordering mechanism of cold crystallization in which the π–π interactions among the dimers serve as ordering bonding forces to drive intermolecular cooperativity before intramolecular changes of conformation, and the dimer aggregation triggers the phase-separated mesomorphic domains before the growth of crystalline nanograins (non-lamellar crystals). As distinct from the hierarchical structure of nanograins within mesomorphic domains, the formation of lamellar crystallites within spherulites without undergoing the dimer aggregation were observed form the melt crystallization at 200 °C." @default.
• W2017863392 created "2016-06-24" @default.
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• W2017863392 date "2013-10-01" @default.
• W2017863392 modified "2023-10-18" @default.
• W2017863392 title "Formation of mesomorphic domains associated with dimer aggregates of phenyl rings in cold crystallization of poly(trimethylene terephthalate)" @default.
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• W2017863392 doi "https://doi.org/10.1016/j.polymer.2013.09.006" @default.
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