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Thermal properties of cationic dyeable copolyester

Wang Xiuhua~1,Wang Weixing~2,Chen Lian~2,Zhou Yonggang~2,Meng Jicheng~3,Yao Yuyuan~1 (1.Key Laboratory of Advanced Textile Materials and Manufacturing Technology,Ministry of Education, Zhejiang Sci-Tech University;Hangzhou 310018;2.Shaoxing City Jinhua Gaoxin Colorized Fiber Co.,Ltd., Shaoxing 312000;3.Zhejiang Donghua Fiber Manufacture Co.,Ltd,Hangzhou 311245)  
A cationic dyeable copolyester(ECDP) was synthesized by adding the third monomer,5-sodium suflo bis-(hydroxyethyl) isophthalate(SIPE),and the fourth monomer,polyethylene glycol(PEG),on a semicontinuous polymerization unit.The thermal properties of ECDP were studied by thermogravimetric analysis and differential scanning calorimetry.The intrinsic viscosity drop of ECDP chip was tested during the drying and melting process.The results showed that the thermal decomposition temperature of ECDP was decreased and the glass transition temperature was also decreased accordingly with the addition of PEG;the cold crystallization temperature and melting point were affected by the combination of SIPE and PEG;the residence time had an increasing effect on the intrinsic viscosity drop of ECDP melt while increasing PEG amount;The quality of dried chips could be ensured by selecting relatively low drying temperature and long residence time for ECDP with high PEG content.
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