Structural relaxation of hybrid composite of phenol formaldehyde

Abstract

Glass-palm fibre reinforced hybrid phenol formaldehyde (PF) composites have been studied at constant heating rate by using differential scanning calorimetry (DSC). Sample under investigation is annealed for different times and temperatures. Glass transition temperature (<i>T</i>_g)<i>, </i>crystallization temperature (<i>T</i>_c)<i> </i>and heat absorbed (Δ<i>H</i>) in glass transition region have been calculated for glass-palm fibre reinforced hybrid phenol formaldehyde composite. It is found that <i>T</i>_c<i>-T</i>_g<i> </i>and Δ<i>H </i>are maximum at annealing time of 60 min and temperature of 60°C. This composite is found to be more thermally stable at these annealing time and temperature due to structural relaxation.