Abstract
Solution and solid state 13C nuclear magnetic resonance (13C NMR) spectra for poly(methacrylic anhydride) (PMAH) polymers with various tacticities and thermal histories were correlated with infrared spectra and gel permeation chromatographs to detect anhydride crosslinks. Under most baking conditions, thin films of isotactic poly(tert-butyl methacrylate) (PtBMA) formed spherulitic crystals upon conversion to isotactic PMAH (i-PMAH), whereas PMAH prepared from 83% syndiotactic PtBMA or by the free-radical cyclopolymerization of methacrylic anhydride remained amorphous. Amorphous polymers gave broad solid state 13C NMR peaks, but crystalline i-PMAH yielded multiple carbonyl and α-methyl peaks. The i-PMAH spectra were compared to those for amorphous PMAH and a model compound to assign chemical shifts to PMAH crosslink α-methyl and carbonyl carbons.
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© 1991 Springer Science+Business Media New York
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Granger, D.D. (1991). 13C NMR of Crosslinked Poly(Methacrylic Anhydride). In: Mathias, L.J. (eds) Solid State NMR of Polymers. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-2474-2_10
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DOI: https://doi.org/10.1007/978-1-4899-2474-2_10
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