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Thermal degradationEffect of temperature on the drying of PET is very complicated, it not only affects the diffusion rate of water vapor, also affect the chemical process during the drying, so ultimately affect the properties of the resin. Consider the potential hydrolysis and thermal process is necessary, as previously described, accompanied by a decline in IV, hydrolyzed faster at above 150 ℃, because the thermal transition process is faster than the diffusion process, when the drying temperature is disadvantageous premature increase a.Similarly, even if most of the water vapor can be pumped, but the high temperatures (e.g. higher than 180 ℃) will cause the thermal degradation and thermal oxidation (in air drying system), so that a polymer chain scission, but also the release of by-product material , leading to physical degradation.