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Ionic polycondensation effects on the radical autocondensation of polyflavonoid tannins: An ESR study
Author(s) -
Garcia R.,
Pizzi A.,
Merlin A.
Publication year - 1997
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19970926)65:13<2623::aid-app4>3.0.co;2-d
Subject(s) - ionic bonding , electron paramagnetic resonance , hardening (computing) , chemistry , radical , tannin , polymer chemistry , photochemistry , organic chemistry , ion , nuclear magnetic resonance , physics , food science , layer (electronics)
An electron spin resonance (ESR) study of the presence or lack of interference by ionic hardening mechanisms and ionic coreactants on the polyflavonoid tannin radical autocondensation reaction indicated that in certain cases hardening by ionic coreactants can be coupled with the simultaneous hardening of the tannin by radical autocondensation. Some coreactants tend to depress the tannin radical autocondensation while still leaving a small contribution of this reaction to the formation of the final crosslinked network. Other coreactants instead appear to enhance formation of the final network by synergy between ionic and radical mechanisms, while still others do not show any interference between the two types of reaction. Mechanisms describing the interaction between the two reactions are proposed and discussed. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65: 2623–2633, 1997