Vinyl alcohol-vinyl propionate copolymers: sequence distribution and glass transition

13C nuclear magnetic resonance (n.m.r.) spectroscopy was used for the determination of the sequence distribution in vinyl alcohol-vinyl propionate (VAL-VP) copolymers prepared by two different methods: by partial alkaline hydrolysis of poly(vinyl propionate) and by partial esterification of poly(vin...

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Bibliographic Details
Published in:Polymer (Guilford) 1988-12, Vol.29 (12), p.2244-2248
Main Authors: Sánchez-Chaves, Manuel, Arranz, Félix, Montes, Margarita
Format: Article
Language:English
Subjects:
13C nuclear magnetic resonance
Applied sciences
copolymer composition
Exact sciences and technology
glass transition temperature
Organic polymers
Physicochemistry of polymers
Properties and characterization
sequence distribution
Structure, morphology and analysis
vinyl alcohol-vinyl propionate copolymers
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Summary:13C nuclear magnetic resonance (n.m.r.) spectroscopy was used for the determination of the sequence distribution in vinyl alcohol-vinyl propionate (VAL-VP) copolymers prepared by two different methods: by partial alkaline hydrolysis of poly(vinyl propionate) and by partial esterification of poly(vinyl alcohol). The 13C n.m.r. spectra of the methylene carbons in the main chain show three split peaks, whose intensities change with copolymer composition. These peaks can be assigned to the three dyad sequences. The results obtained show that vinyl propionate units have an alternating tendency in VAL-VP copolymers prepared by esterification and a block distribution in VAL-VP copolymers prepared by hydrolysis. The T g values of VAL-VP copolymers prepared by the two different methods are influenced by both the overall copolymer composition and the monomer sequence distribution.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(88)90118-8