化工学报2013，Vol.64Issue(2)：742-748,7.DOI:10.3969/j.issn.0438-1157.2013.02.046
丙烯腈溶液共聚过程体系黏度变化的动态测定与理论分析
Viscosity behavior of solution copolymerization of acrylonitrile and itaconic acid: on-line determination and theoretical analysis
摘要
Abstract
A programmable torque rheometer was used for on-line determination of zero shear viscosity of solution copolymerization of acrylonitrile and itaconic acid in dimethylsulfoxide. The Arrhenius- Frenkel-Eyring equation was extended to identify the dependence of zero shear viscosity on polymer content, temperature and viscosity-average molecular weight of polyacrylonitrile. It was observed that under all of these process conditions, small differences in feed composition would give rise to a large variation on zero shear viscosity and ultimate viscosity to more than 100 Pa · s, so the control strategy for viscosity should be considered critically. The changes of reaction temperature seemed to be more effective than other methods. The viscosity increased quickly from about 2 mPa · s to 2-3 Pa · s in the first three hours under all experiment conditions which would greatly depress heat exchange and mixing efficiency. It was also found that viscosity increased dramatically as a result of gel effect when total overall monomer mass fraction was beyond 28% in feed. In addition, a small increase of polymer content could give rise to a great increase in viscosity when polymer content reached some critical values, which indicated that macromolecules were entangled severely in copolymerization solution.关键词
黏度/聚丙烯腈/分子量/溶液聚合/碳纤维Key words
viscosity/polyacrylonitrile/molecular weight/solution polymerization/carbon fiber分类
化学化工引用本文复制引用
缪金根,王世栋,程振民,周美华,潘鼎..丙烯腈溶液共聚过程体系黏度变化的动态测定与理论分析[J].化工学报,2013,64(2):742-748,7.基金项目
上海市科委资助项目(07DJ14002,09DZ1100203). （07DJ14002,09DZ1100203）
