It is often pointed out that low water absorption and moisture permeability are drawbacks of polypropylene (PP). In this study, blending with an amorphous polymer was used to modify PP. For improving the properties of PP without any property depression, PP was blended with phenolic resin-Novolak typ
Preparation and properties of phenolic resin laminates. I. Laboratory evaluation
✍ Scribed by J. F. Meier; E. M. Bellott Jr.; P. P. Frank
- Publisher
- John Wiley and Sons
- Year
- 1977
- Tongue
- English
- Weight
- 480 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0021-8995
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
The preparation and properties of sodium carbonate and sodium hydroxide‐catalyzed phenolic resins polymerized in 1‐liter glass reactors over a broad range of F/P mole ratios are described. Laminates produced from selected sodium carbonate‐catalyzed resins coated on kraft paper are discussed and compared with laminates prepared from standard sodium hydroxide‐catalyzed resins. Several apparent advantages of the sodium carbonate‐catalyzed resin systems over the sodium hydroxide‐catalyzed resins are presented. The superior performance is attributed to the high degree of crosslinking resulting from the high concentration of methylolated phenols present in the sodium carbonate‐catalyzed resin.
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Glass transition temperatures of oxidative polymerized films were measured by the dynamic+mechanical method and by l i e w i d t h measurements (NMR). The correlation was studied in relation to the chemical structure. The films investigated were polymerized linseed oil, alkyd resins, phenolic varnis