摘要
用柠檬酸与聚乙二醇缩聚合成了柠檬酸-聚乙二醇共聚物(PEGCA),研究了其反应动力学和流变行为。结果表明,反应活化能为61.9kJ/mol,指前因子为1.89×105 kg/mol.min;除了反应温度为130℃、反应时间为35h的PEGCA在60℃下测试时显示出明显的剪切变稀行为外,其他PEGCA样品均为牛顿流体;反应时间为35h的PEGCA的非牛顿指数和稠度分别为0.13和1.3×106 mPa.sn;PEGCA的黏流活化能较低,约为31～40kJ/mol,反应时间对PEGCA的活化能基本没有影响。
Poly （polyethylene glycol-co-citric acid） （PEGCA） was synthesized via condensation reaction between citric acid and polyethylene glycol. Its reaction kinetics and rheological behaviors of the product were studied. It showed that the energy of activation was 61. 9 kJ/mol and the frequency factor was 1. 89 X 10s kg/mol . min. Measurements showed that the PEGCA samples were Newtonian fluid. The only exception was the sample prepared with the reaction temperature and time of 130 °C and 35 h, respectively, measured at 60 °C, While the reaction time is 35 h,its non-Newtonian index and consistency were 1.3 and 1.3 N 106 mPa . sn, respectively. The relatively low viscous activation energy （31-40 kJ/mol） of PEGCA is showed that the reaction time had little effect on the viscous activation energy.
出处
《中国塑料》
CAS
CSCD
北大核心
2012年第10期36-41,共6页
China Plastics
关键词
柠檬酸
聚乙二醇
生物降解
反应动力学
流变行为
黏度
citric acid
polyethylene glycol
biodegradation
reaction kinetic
rheological behavior
viscosity
