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Session D40 - Poster Session I.
POSTER session, Monday afternoon, March 12
Exhibit Hall, Washington State Convention Center

[D40.081] In-situ Structural Studies during PBO Fiber Spinning by Synchrotron WAXD/SAXS

Shaofeng Ran, Christian Burger, Dufei Fang, Xinhua Zong, Sharon Cruz, Benjamin Hsiao, Benjamin Chu (Dept.of Chemistry, State University of New York at Stony Brook), Robert Bubeck (Michigan Molecular Institute), Kazuyuki Yabuki, Yoshihiko Teramoto (Toyobo Co. Ltd, Research Center, Japan), David Martin, Michael Johnson (Department of Materials Science and Engineering, University of Michigan), Philip Cunniff (Department of the Army, Natick Research, Development amp; Engineering Center), Michigan Molecular Institute Collaboration, Toyobo Co. Ltd Collaboration, Department of Materials Science and Engineering Collaboration, Department of the Army Collaboration

A spinning unit was adapted to the Advanced Polymers Beamline at X27C of the National Synchrotron Light Source (NSLS), Brookhaven National Lab (BNL) to perform in-situ fiber spinning studies. WAXD patterns indicated that the structure before coagulation had a lyotropic liquid-crystalline order that cannot be simply nematic. After the fiber had passed through the coagulation water bath, ranging from 25-60 C, a significant ordering had taken place. The meridian peaks showed streaks. Two models, a Pi-interacting sanidic lyotropic solution and a crystal with translational disorder, could be used to explain the structures before and after coagulation. SAXS patterns of the PBO fiber after coagulation showed equatorial streaks.

Part D of program listing