关键词: 聚对苯二甲酸乙二醇-1, 4-环己烷二甲醇酯, 扩链反应, 流变性能, 扩链剂联用

Abstract: In this paper,chain extenders were added to poly(ethylene terephthalateco1,4cylclohexylenedimethylene terephthalate)(PETG) to improve its melt strength and viscosity through reactive processing. Effect of chain extenders on structure and rheological behavior of PETG was studied by fusion index instrument, rotational rheometer,and torque rheomoeter. It was revealed that, the simultaneous addition of pyromellitic dianhydride(PMDA) and triglycidylisocyanurate(TGIC) to PETG led to higher melt strength and viscosity. In this case, the melt flow index of the extended PETG decreased from 12.83 to 7.50 g/10 min. While the zeroshearing viscosity (η0) increased from 2020 to 4760 Pa·s and the characteristic relaxationtime (τ0) increased from 0.78 to 3.58 s. Moreover, the extended PETG remained a linear structure and no gel was formed.

Key words: Poly (ethylene terephthalateco-1, 4-cylclohexylenedimethyleneterephthalate), chain-extension reaction, rheological properties, combining chain extending agents