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End‐group analysis of poly(phenyl glycidyl ether), 2 . Hydroxylic groups using 19 F nuclear magnetic resonance
Author(s) -
Ronda Joan Carles,
Serra Angels,
Mantecón Ana,
Cádiz Virginia
Publication year - 1994
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1994.021951014
Subject(s) - chemistry , polymer chemistry , ether , derivatization , adduct , end group , nuclear magnetic resonance spectroscopy , polymer , tacticity , organic chemistry , polymerization , high performance liquid chromatography
The hydroxylic end‐groups in the soluble fraction of poly(phenyl glycidyl ether) (PPGE) obtained with the aluminium isopropoxide (AIP)/ZnCl 2 initiator system are studied using 19 F NMR spectroscopy. Derivatization as trifluoroacetate esters affords poor structural information and handle difficulties. Hexafluoroacetone (HFA) hemiketalic adducts are much more easily prepared and offer more information, allowing not only to distinguish between primary and secondary alcohols but showing a clear sensitivity to the tacticity. This method is successful to calculate the percentage of hydroxylic end‐group in the polymer chain. In the case of an irregular PPGE sample, obtained with AIP alone as initiator, it is possible to identify three different hydroxylic end‐groups.