勲 持田

Molecular Alignment and Domain Assembles in the Uni-chromic Mesophase Spherules Prepared from Synthetic Naphthalene Isotropic Pitch

TitleMolecular Alignment and Domain Assembles in the Uni-chromicMesophase Spherules Prepared from Synthetic Naphthalene Isotropic PitchAuthor(s)Chang, Young-Chul; Sohn, Hun-Joon; Wang, Yong-Gang; Korai, Yozo;Nakagawa, Yoshiteru; Mochida, IsaoCitation九州大学大学院総合理工学研究科報告 ¦¦ 21(2) ¦¦ p161-165; Engineeringsciences reports, Kyushu University ¦¦ 21(2) ¦¦ p161-165Issue Date 1999-09URL http://hdl.handle.net/2324/16557Right

Transverse Sphere and Texture of Carbon Fibers Prepared through Cross Shaped Nozzles of Different Lobe Dimensions

Methylnaphthalene <bived mesophase pitch was spun through Y- and cross- shaped nozzles of different lobe dimensions in temperature range of 280 to 295°C by fixing the spinning rate to evaluate die-swelling phenomena which defonned cross-sectional shape and domain alignment of the carbon fiber. The higher temperature of spinning enhanced the refonnation through the lower viscosity. The thinner lobe emphasized the die-swelling through the larger shear rate, which reduces the viscosity, although the nozzles of the present study had the same cross-sectional area. Shape factors of the nozzle and fiber rescribe the extents of cause and results of die-swelling, respectively. Die-swelling is found to change the radial type alignment of the constituent domains to random order. The degrees of preferred orientation along the fiber axis were slightly influenced by die-swelling. The pressure in spinning and the nozzle shape were correlated to the reformation extent of the resultant fiber.