## Abstract Furfuryl alcohol resins contain a broad spectrum of compounds. The distribution of these compounds in a given resin varies with the manufacturing conditions. A resin containing a high proportion of low molecular weight constituents has been prepared and separated into fractions. Twelve
NMR study of the carbonization process of furfuryl alcohol resin
✍ Scribed by S. Głowinkowski; Z. paja̧k
- Publisher
- Elsevier Science
- Year
- 1982
- Tongue
- English
- Weight
- 452 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0008-6223
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✦ Synopsis
Proton CW and pulse NMR studies for furfuryl alcohol resin carbonized over the temperature range 60-86O"C are performed. The results are interpreted in terms of structural and chemical changes taking place during heat treatment. Heating up to: (i) 240°C results in an increase in molecular weight and crosslinking; (ii) 320°C produces crosslinking sufficient to form a rigid structure; (iii) 380°C and higher leads to hydrogen release and appearance of paramagnetic centers.
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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 po
The reactions between furfuryl alcohol (FA)/poly(furfuryl alcohol) (PFA) and hexamethylenetetramine (HMTA) have been studied by 13 C and 15 N high-resolution solid-state NMR techniques. Highly crosslinked polymer networks similar to those obtained from the thermal curing of FA resins under acidic co
## Los 241amo.~, ,Vew Mexico). A study has revealed that major differences exist between the physical flroperties of graf'hites manufactured with y-alumina-polymerized furfury. alcohol resin binders and those made with acid-polymerized resins. The causes of these property differences have been dir