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An NMR study of poly(furfuryl alcohol) prepared with p‐toluenesulphonic acid
Author(s) -
Principe Martha,
Ortiz Pedro,
Martínez Ricardo
Publication year - 1999
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199908)48:8<637::aid-pi206>3.0.co;2-c
Subject(s) - furfuryl alcohol , polymer , dept , branching (polymer chemistry) , carbon 13 nmr , nuclear magnetic resonance spectroscopy , proton nmr , relaxation (psychology) , materials science , nmr spectra database , chemistry , polymer chemistry , spectral line , organic chemistry , stereochemistry , physics , catalysis , psychology , social psychology , astronomy
Poly(furfuryl alcohol) with M n = 2–2.2 × 10 3 was prepared using p ‐toluenesulphonic acid in methylene chloride. Polymer structures were determined by 1 H and 13 C NMR spectroscopy. The 1 H NMR spectrum indicated the predominance of linear sequences and the absence of CH 2 OCH 2 bonds in the polymer. The 13 C NMR spectrum displayed broad signals between 30 and 42 ppm, observed previously only in the CP/MAS NMR spectra of the crosslinked polymer and attributed to branched sequences. The 13 C NMR DEPT treatment excluded the possibility that the broadening of the signals was due to the medium and suggested instead that the cause was the number of possible configurations in the polymer chains associated with the dispersion of branches and chain lengths. Quantitative measurements (relaxation interval D1(s) = 20 for the extinction experiments of the nuclear overhauser enhancement) provided both the main polymer structure and the ratio of branching to linear sequences, which ranged from 1:2 to 1:3. © 1999 Society of Chemical Industry