A STUDY OF THE THERMAL-PROPERTIES OF BLENDS OF POLY(VINYL CHLORIDE) WITH NOVEL EPOXYPROPANECARBAZOLE-BASED DYES BY TGA FTIR/

Thermal properties of blends of poly(vinyl chloride) (PVC) with two no vel dyes, 3-(4-bromophenylazo)-9-(2,3-epoxypropane)carbazole (I) and 3 -(4-nitrophenylazo)-9-(2,3-epoxypropane)carbazole le (II) have been s tudied by thermogravimetric analysis coupled with Fourier transform in frared spectroscopy. It was found that these additives can be used as effective dyes while having little effect on the thermal stability of PVC up to 200 degrees C. These data were also confirmed by analysis of hydrogen chloride evolution by GC and FTIR. Kinetic analysis by the O zawa-Flynn-Wall method yields the following values of activation energ y for given degrees of conversion: for alpha = 0.5, E lies in the rang e 108.8-157.5 kJ mol(-1) for PVC-I blends and 140.0-146.0 kJ mol(-1) f or PVC-II blends. (C) 1998 Elsevier Science Ltd. All rights reserved.