Parameswaran, P S; Dr. Eby Thomas, Thachil(Cochin University of Science and Technology, December 30, 2009)
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Abstract:
Phenolic resins suffer from the presence of microvoids on curing. This often
leads to less than satisfactory properties in the cured resin. This disadvantage has
limited the use of phenolic resins to some extent. This study is an attempt to improve
the mechanical properties of the phenolic resol resins by chemical modification
aimed at reducing the microvoid population. With this end in view various themoset
resins synthesised under predetennined conditions have been employed for
modifying phenolic resols. Such resins include unsaturated polyester, epoxy and
epoxy novolac prepolymers.
The results establish the effectiveness of these resins for improving the
mechanical properties of phenolics. Experimental and analytical techniques used
include FTIR, DMA, TGA, SEM and mechanical property evaluation. While most of
the modifier resins employed give positive results the effect of adding UP is found to
be surprising as well as impressive.
Description:
Department of Polymer Science and Rubber
Technology, Cochin University of Science and Technology