Kinetic investigation of thermooxidative degradation of poly(vinyl chloride)/acrylonitrile–butadiene–styrene blends by isothermal thermogravimetric analysis

✍ Scribed by I. Klarić; U. Roje; N. Stipanelov

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 150 KB
• Volume: 71
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19990131)71:5<833::aid-app18>3.0.co;2-a

✦ Synopsis

The thermal degradation of poly(vinyl chloride)/acrylonitrile-butadienestyrene (PVC/ABS) blends of different compositions was investigated by means of isothermal thermogravimetric analysis at temperatures of 210°-240°C in flowing atmosphere of air. The Flynn equation, the method of stationary point, and kinetic equation using the Prout-Tompkins model proved to be satisfactory in describing the thermooxidative degradation in the range of 5-30% conversions. The apparent activation energy E and preexponential factor Z were calculated for all compositions of PVC/ABS blends. The ratios E/ln Z are constant for pure and modified PVC and point to the unique mechanism of degradation process. Upon increasing the ratio of ABS in the PVC/ABS blend up to 50%, only the rate of the process is changed; the mechanism remains unchanged.