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- W4251448395 abstract "Thermal dehydration process of PMAA was investigated by solid-state 13C NMR. For heat-treated PMAA at 150°C, at which the dehydration goes very slowly, we observed three 13C peaks at 172, 178, and 187 ppm in the carboxyl group region. The peak at 172 ppm is due to the intramolecular cyclic anhydrides by comparing the reported value of 13C chemical shift. The peaks at 178 and 187 ppm were assigned to regularly aligned free carboxylic acids and intermolecular acid dimers, respectively, from the 2D-exchange 13C NMR spectra, 13C chemical shift values and IR spectra. We concluded that by heat-treatment the rearrangement of intermolecular hydrogen bonding of the carboxylic acids in PMAA occurs firstly to form the regularly aligned acid dimers, and the dimers dissociated to be the regularly aligned free carboxylic acids at high temperatures. The adjacent free carboxyl acids dehydrate with each other, resulting in the formation of intramolecular anhydrides. © 1999 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 37: 2007–2012, 1999" @default.
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- W4251448395 date "1999-08-15" @default.
- W4251448395 modified "2023-09-28" @default.
- W4251448395 title "Solid‐state 13C NMR study on thermal dehydration process of poly(methacrylic acid)(PMAA)" @default.
- W4251448395 doi "https://doi.org/10.1002/(sici)1099-0488(19990815)37:16<2007::aid-polb5>3.3.co;2-z" @default.
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