RENEWABLE RESOURCE MATERIAL - I : A STUDY TO UTILIZE THE POTENTIAL ATTRIBUTES OF CARDANOL
Abstract
Cardanol-based vinyl ester resin (CVER) was blended with varying concentrations of CTBN ranging between 0 to 15 wt% with an interval of 5 wt%, by two different approaches, viz., physical and chemical blending. The formation of various products during the curing of blend samples has been studied by FTIR spectroscopic analysis. The dynamic DSC scans showed that the blend samples of CVERs cured in the temperature range of 100-150°C. It was observed that the blend sample containing 5 wt% and 10 wt% liquid rubber, for physical and chemical blending, respectively, showed least cure time, at 120°C, amongst all other blend samples. On evaluation, it was found that blend samples (5 wt% for physical blending and 10wt% for chemical blending) exhibited better thermal and mechanical properties as compared to pure vinyl ester resin. The blend morphology, studied by scanning electron microscopy analysis, showed the presence of precipitated discrete rubber particles which dispersed throughout the vinyl ester matrix i.e. they revealed the presence of two phase morphology.
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