STUDY OF PHENOLIC RESIN EVA BLENDS BY THERMAL-ANALYSIS/

The properties of polymeric blends originate from the synergistic asso ciation of their components. In this investigation, phenolic resins ob tained by the reaction of cashew-nut shell liquid (CNSL) and aldehyde are used in several applications. Mixtures of CNSL with industrial rej ect ethylene-co-vinyl acetate (EVA reject) were prepared with an EVA r eject content up to 70%. The thermal compatibility and stability were evaluated by means of thermogravimetry (TG), derivative thermogravimet ry (DTG) and differential scanning calorimetry (DSC). For blends conta ining a high percentage of EVA reject, the TG curves clearly show two decomposition stages, one at 350 degrees C and the other at 450 degree s C (onset 467 degrees C). The DTG curves of the blend containing 70% CNSL exhibit decomposition at 240 degrees C. The DSC curves show that the samples containing a high percentage of EVA reject are incompatibl e, with T-g values around -30 degrees C.