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The 1H and 13C NMR spectra of alternating isobutene/maleic anhydride copolymer and the corresponding acid and sodium salt — a stereochemical analysis

✍ Scribed by Hartmut Komber

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
513 KB
Volume
197
Category
Article
ISSN
1022-1352

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✦ Synopsis

The 'H and I3C NMR spectra of an alternating isobutene/maleic anhydride copolymer and the corresponding acid and sodium salt forms were reexamined by 1D and 2D NMR methods. This copolymer contains only threo-succinyl units. The tacticity is characterized by a 53/41 ratio of threo-diisotactic and threo-disyndiotactic triads. The preference of the diisotactic triad was concluded from NMR data. A model was proposed to explain the stereoselectivity of the copolymerization reaction. This model also leads to the conclusion that the diisotactic triad should be preferred for steric reasons. 13C-T, values and nuclear Overhauser effect (NOE) values for these three copolymers were determined and discussed in terms of segmental motion.

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