TY - JOUR
TI - Thermal properties of MECDP copolyesters
AU - Zhao Ming-Liang
AU - Liu Yuan
AU - Li Fa-Xue
AU - Wang Xue-Li
AU - Gao Yu
AU - Yu Jian-Yong
JN - Thermal Science
PY - 2012
VL - 16
IS - 5
SP - 1456
EP - 1459
PT - Article
AB - MECDP copolyesters based on poly(ethylene terephthalate) were prepared with  sodium-5-sulfo-bis-(hydroxyethyl)-isophthalate and poly(ethylene glycol)  units as modifiers. Thermal properties of these copolyesters were  characterized by differential scanning calorimetry and thermal gravity  analyzer. Experimental results indicated that glass transition temperature,  melting temperature and thermal degradation temperature reduced with  increasing the poly(ethylene glycol) content. The incorporation of  poly(ethylene glycol) increased the flexibility and irregularity of molecular  chains which led to lower crystallinity, and bought more ether bonds into  molecular chains. Besides, the thermal degradation under oxygen condition  happened easily compared to that under nitrogen condition.