143.
In this study HCl generation of polyvinyl (chloride) (PVC)/SiO
2 composites during its combustion was investigated. SiO
2 with different particle sizes were used as HCl absorbers and their HCl uptake ability results were compared to that of CaCO
3. It was found that the amount of released HCl gas during PVC combustion decreased in the presence of SiO
2. The HCl uptake ability of SiO
2 improved with decreasing of its particle size. Although thermogravimetric analysis (TGA) results showed that SiO
2 particles decreased the first thermal degradation temperature (
T onset) of PVC by initiating dehydrochlorination of PVC at lower temperatures, SiO
2 particles had more effective HCl uptaking ability than that of CaCO
3. Scanning electron microscopy (SEM) micrographs showed that some aggregates whose size was less than 100 nm were formed when Si-25 nm was used as filler. When SiO
2 with micron size was added to PVC as filler, more uniform and better distribution of the SiO
2 on the surface was observed.
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