An NMR study of poly(furfuryl alcohol) prepared with p-toluenesulphonic acid

✍ Scribed by Principe, Martha; Ortiz, Pedro; Martínez, Ricardo

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 98 KB
• Volume: 48
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199908)48:8<637::aid-pi206>3.0.co;2-c

✦ Synopsis

Poly(furfuryl alcohol) with M n = 2±2.2 Â 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 ÐCH 2 ÐOÐCH 2 Ð 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 con®gurations 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.