Physical properties of oxidative polymerized films prepared from polymerized oils, alkyd resins, and phenolic varnishes: Transition by dynamic-mechanical method and line-width measurement (NMR)
✍ Scribed by L. W. Chen; Ju Kumanotani
- Publisher
- John Wiley and Sons
- Year
- 1965
- Tongue
- English
- Weight
- 485 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0021-8995
No coin nor oath required. For personal study only.
✦ Synopsis
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 varnishes, and polyester-urethane films. It i s found that the effects of chain stiffness and the degree of crosslinking predominate in T, measured by the dynamic-mechanical method, w h e m the effect of polar groups is most important on T, measured by linewidth measurement. It was previously reported that To as measured by the linewidth measurement increased with the degree of crosslinking in vulcanized rubbers. This was not observed in films of phenolic varnishes, as the variation of the polar groups was involved. The meaning of T, measured by different methods is also discussed from the thermodynamic standpoint.