## Abstract Phenanthrene was treated with formaldehyde in the presence of sulphuric acid and the yields of resin obtained were dependent on the acid concentration and on the molar ration of formaldehyde to phenanthrene. All of the resins were composed of dimers, trimers, tetramers and higher oligom
Preparation and properties of phenolated phenanthrene-formaldehyde resins
✍ Scribed by Herbert, Lesley D. ;Robinson, J. Gordon ;Marr, George
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1982
- Tongue
- English
- Weight
- 351 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0007-1641
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✦ Synopsis
Abstract
Phenanthrene‐formaldehyde resins of different oxygen content were reacted with phenol 110°C in the presence of a strong acid catalyst. Cleavage occurred at the dimethylene ether and acetal bridges joining the aromatic nuclei with the concomitant formation of phenanthrene‐formaldehyde‐phenol resins. These resins were characterised by gel permeation chromatography, ^1^H n.m.r. and infrared spectroscopy.
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Phenol formaldehyde precursors in the form of powder and I mm thick platelets were carbonized in flowing nitrogen up to 1000°C with a heating rate of 2O"/h. Evolution of carbonization products is different for the bulk and powdered samples. The observed differences are caused by secondary reactions
## Abstract **Summary:** Phenolic resin composition depends on monomer ratio, catalyst, reaction conditions, and residual free monomers. Using a simple device for parallel synthesis, large numbers of samples of different compositions were prepared. Residual free phenol and formaldehyde were determi