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- W2054646253 abstract "The formation of lamellar structures in polyacrylonitrile (PAN) fibers was investigated in the temperature range from 25 to 500 °C using synchrotron small-angle X-ray scattering. It was found that, in addition to a first lamellar mesophase showing up at about 200−300 °C, a second lamellar mesophase appears in an inert atmosphere at temperatures higher than about 350 °C. The former was attributed to the cyclization, the latter to the aromatization reaction of PAN. The periods of the first (α) and the second (β) lamellar phase are about 13 and 5 nm, respectively. Both the α and the β phase show preferred orientation. The average angle between the fiber axis and the normals of the lamellae is about 15°. Homopolymer and copolymer fibers differ considerably in the kinetics of developing the α phase." @default.
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- W2054646253 date "2000-03-08" @default.
- W2054646253 modified "2023-10-01" @default.
- W2054646253 title "Lamellar Mesophases in Polyacrylonitrile: A Synchrotron Small-Angle X-ray Scattering Study" @default.
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- W2054646253 doi "https://doi.org/10.1021/ma991298k" @default.
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