Reactive compatibilization of a nitrile rubber/phenolic resin blend: Effect on adhesive and composite properties
✍ Scribed by P. Sasidharan Achary; R. Ramaswamy
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 472 KB
- Volume
- 69
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
Resole phenolic resins containing various p-cresol (PC) to phenol (P) mol ratios were prepared and characterized. These phenolic resins were blended with nitrile rubber (NBR) and the measurements of adhesive joint strength, stress-strain properties, DSC, TGA, DMA, TEM, and SEM were performed using a 50 : 50 NBR/phenolic resin blend. It was observed that the adhesive joint strength and the mechanical properties of the blend enhanced significantly on incorporation of p-cresol into the phenolic resin, and the optimum p-cresol/phenol mol ratio was in the vicinity of 2 : 1. Observation of a more continuous phase and the increase in T g of the rubber region in the blend indicated increased reactivity and compatibilization of NBR with phenolic resin as p-cresol was incorporated. The effect of silica filler on the properties of the nitrile rubber/phenolic resin blend was also studied without and with p-cresol modification and the results suggest that silica filler take not only the role of a reinforcing filler in the nitrile-phenolic-silica composite, but also a role as surface compatibilizer of the blend components.