Thermal Behavior of Polyester/Phenolic Resins by TG/DTG/DTA

摘要

Phenolic resins of Novolak type were prepared using raw Cashew Nut Shell Liquidrn(CNSL) to replace petrochemical phenol. The use of CNSL brings out several advantagesrnsuch as: it is a biodegradable raw material, has a low cost and Brazil is the second worldrnproducer. In this meaning, phenolic resins were developed using CNSL and then mixedrnwith commercial polyester. The resins were characterized by thermal analysis likernThermogravimetry (TG/DTG) and Thermal Differential Analysis (DTA) and theirsrnactivation energy were studied using Thermokinetics software from Netzsch. their values ofrnactivation energy according to Friedman and Ozawa-Frynn-Wall models were at largernrange, arriving a maximum near 250KJ/mol for polyester and 300KJ/mol forrnpolyester/CNSL resin blend. The coating obtained to ceramic of this blend exhibitedrnhardness and light color.