二甘醇改性PETG共聚酯流变性能研究  

Study on rheological properties of PETG copolyester modified by diethylene glycol

作　　者：胡利如 景旋 孙玉洁 夏峰伟 常玉 Hu Liru;Jing Xuan;Sun Yujie;Xia Fengwei;Chang Yu(Research Institute of Sinopec Yizheng Chemical Fibre Co.,Ltd.,Yizheng Jiangsu 211900,China)

机构地区：[1]中国石化仪征化纤有限责任公司研究院,江苏仪征211900

出　　处：《合成技术及应用》2023年第3期40-44,共5页Synthetic Technology & Application

摘　　要：为了提高聚对苯二甲酸乙二醇-1,4环己烷二甲醇酯(PETG)的加工流动性能,在分子链中引入柔性的二甘醇(DEG)结构,制备了DEG含量分别为1.16%、1.6%、2.03%的PETG改性共聚酯。采用毛细管流变仪研究了PETG改性共聚酯的流变性能。结果表明,不同DEG含量的PETG的剪切黏度随剪切速率的增高而降低,且非牛顿指数均小于1;在相同的剪切速率下,DEG含量越高,PETG的黏流活化能越小,共聚酯越容易在低温下产生流动,熔体黏度也会相应降低,说明DEG有利于改善熔体的流动性,使其加工性能提高。In order to improve the processing fluidity of polyethylene terephthalate(PETG),a flexible diethylene glycol structure was introduced into the molecular chain to prepare PETG modified copolyesters with diethylene glycol content of 1.16%,1.6%and 2.03%,respectively.The rheological properties of PETG modified copolyesters were studied by capillary rheometer.The results show that the shear viscosity of PETG with different diethylene glycol content decreases with the increase of shear rate,and the non-Newtonian index is less than 1.At the same shear rate,the higher the content of diethylene glycol,the smaller the visco-flow activation energy of PETG,the easier the copolyester will flow at low temperature,and the viscosity of the melt will decrease accordingly,indicating that diethylene glycol is conducive to improving the fluidity of the melt and improving its processability.

关 键 词：PETG 流变性能 非牛顿指数 黏流活化能 

分 类 号：TQ322[化学工程—合成树脂塑料工业]