PET/PEN共混物的热分解行为及其动力学

研究了惰性气氛下聚对苯二甲酸乙二酯(PET)/聚对萘二甲酸乙二酯(PEN)共混物的非等温热分解行为及其动力学.研究发现,不同PET/PEN共混物的热降解为一个主要的热分解过程,热分解反应为一级反应.随着共混物中PEN质量分数的增加,共混物的起始分解温度逐渐升高,共混物的热稳定性逐渐提高,而且共混物的热分解反应活化能也逐渐增加,这是由于PEN分子链中萘环的热分解温度比PET中苯环高,因此分子链的热稳定性比PET要高.共混物中萘环的化学组成含量越高,则热稳定性愈高.

Thermal Degradation Kinetics of PET/PEN Blends

The non-isothermal degradation processes of poly(ethylene terephthalate)(PET) and poly(ethylene 2,6-naphthalate)(PEN) blends were studied by using thermogravimetry(TG) analysis in nitrogen.The non-isothermal degradation of various PET/PEN blends were found to be one-staged degradation processes and first order reaction.The PET/PEN blends with more PEN component exhibited with higher decomposed temperature than those with less PEN contents due to the naphthalene nucleus has a higher thermal stability than that of phenyl nucleus.The apparent activation energy(E) of blends is calculated by Ozawa method and the results suggest that the blend with more content of PEN has a higher value of E.