A GPC method to determine the composition of two component copolymers |
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| Authors: | Zs. Fodor Á. Fodor J. P. Kennedy |
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| Affiliation: | (1) Composites Laboratory, Michigan Molecular Institute, 48640 Midland, MI, USA;(2) Lawrence Livermore National Laboratory, Chemistry and Materials Science Department, University of California, 94550 Livermore, CA, USA |
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| Abstract: | Summary The hydrolytic degradation of Kevlar 49 fibers when dissolved in H2SO4 is characterized from (i) Fourier transform infrared (FTIR), CNH analyses and optical microscopy studies of insoluble crystals formed in the PPTA-H2SO4 dope and (ii) the rates of H2SO4-catalyzed hydrolysis of model compound aromatic amides. After hydrolysis of a PPTA amide linkage, the amide linkage adjacent to the freshly formed-COOH macromolecular end group rapidly hydrolyses resulting in the formation of terephthalic acid which then forms insoluble crystals in the PPTA-H2SO4 dope.Dedicated to Professor Dragutin Fle on the occasion of his 70th birthdaySupported in part by U.S. Department of Energy, LL National Laboratory under Contract W-7405-Eng-48 |
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