Diffusion of Butylated Hydroxy Toluol (BHT) in PVC Films
Makaleler > Tam Makale · 1989
Yazarlar: Devrim Balköse
Spectroscopy Letters, Uluslararası, 1989, cilt 22, ss 569-578
DOI: 10.1080/00387018908053906
Özet
The diffusion coefficient of butylated hydroxy toluol (BHT) in solvent casted PVC films from tetrahydrofurane (THF) was studied by UV spectroscopy. Diffusion coefficient of BHT in PVC at 140, 160 and 180°C were determined as 1.0 × 10−12 3.0 × 10−12 and 6.0 × 10−12 m2/s. The activation energy of diffusion (Ea) was 66 kj/mol. IR spectroscopic work showed that the complete removal of THF was possible by heating films 15 minutes at 140 °C, but that caused formation of C=0 groups in PVC. No dehydrochlorination of films was observed even for heating them at 180 °C for 60 minutes. Antioxidant BHT is volatile at high temperatures, so it is not advisable to use it for high temperature applications.