Gibbs–Thomson analysis of crystalline poly(9,9-di-n-octyl-2,7-fluorene)
نویسندگان
چکیده
Department of Materials Science and Engineering, National Dong Hwa University, Hualien 974, Taiwan, Institute of Materials Science and Engineering, National Sun Yat-sen University, Kaohsiung 804, Taiwan, National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan, and Department of Chemical Engineering, National Tsing Hua University, Hsinchu 300, Taiwan. Correspondence e-mail: [email protected]
منابع مشابه
Phase behavior of poly(9,9-di-n-hexyl-2,7-fluorene).
Here we report the phase behavior of poly(9,9-di-n-hexyl-2,7-fluorene) (PFH), which previously received little attention as compared to its homologues poly(9,9-di-n-octyl-2,7-fluorene) (PFO) and poly(9,9-di-(2'-ethylhexyl)-2,7-fluorene) (PFEH). By means of differential scanning calorimetry, X-ray diffraction, and electron microscopy, we show that there exist four different phases in PFH. The as...
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We report a significant role of side chains in the propagation of molecular orientation upon annealing the liquid crystal phase of polyfluorenes. Direct rubbing of poly(9,9-di(octyl)fluorene) led to the orientation of polymer segments in the top-most region of the film and enhanced propagation of this orientation along the rubbing direction was observed upon annealing. In contrast, the rubbing-...
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Selective formation of amorphous, nematic (N), and beta phases in poly(9,9-di-n-octyl-2,7-fluorene) (PFO) films was achieved via judicious choice of process parameters. Phase structure and film morphology were carefully examined by means of X-ray diffraction as well as electron microscopy. "Amorphous" thin films were obtained by quick evaporation of solvent. Slow solvent removal during film for...
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