Open AccessThermal properties of MECDP copolyesters
Author(s) -
Mi Zhao,
Yuan Liu,
Faxue Li,
Xueli Wang,
Yu Gao,
Jianyong Yu
Publication year - 2012
Publication title -
thermal science/thermal science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.339
H-Index - 43
eISSN - 2334-7163
pISSN - 0354-9836
DOI - 10.2298/tsci1205456z
Subject(s) - ethylene glycol , materials science , differential scanning calorimetry , crystallinity , glass transition , ethylene , degradation (telecommunications) , thermal , polymer chemistry , ether , chemical engineering , polymer , organic chemistry , composite material , chemistry , thermodynamics , catalysis , computer science , engineering , telecommunications , physics
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