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Experimental and Theoretical Investigations of PAN Molecular Weight Increase in Precipitation Polymerization as a Function of H2O/DMSO Ratio
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  • Journal title : Carbon letters
  • Volume 11, Issue 1,  2010, pp.22-27
  • Publisher : Korean Carbon Society
  • DOI : 10.5714/CL.2010.11.1.022
 Title & Authors
Experimental and Theoretical Investigations of PAN Molecular Weight Increase in Precipitation Polymerization as a Function of H2O/DMSO Ratio
Zhang, Jing; Bu, Fengjing; Dai, Yongqiang; Xue, Liwei; Xu, Zhixian; Ryu, Seung-Kon; Jin, Riguang;
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 Abstract
The precipitation polymerization of acrylonitrile (AN) was carried out in a mixture solution of dimethyl sulfoxide (DMSO) and water at using -azobisisobutyronitrile (AIBN) as an initiator. The increased molecular weight polyacrylonitrile (PAN) was prepared with increasing the /DMSO ratio from 10/90 to 80/20. The viscosity average molecular weight of /DMSO solvent was 4.4 times larger than that of /DMF solvent, and precipitation polymerization was accelerlated due to the far decreased chain transfer effect of DMSO. Based on the experimental results, the increased PAN molecular weight was regarded as the summation of two mechanisms: i) particle-particle aggregation and ii) particle-radical attachment. The theoretical equation derived from the mechanisms was well coincided with the experimental results showing the linear relationship between the viscosity average molecular weight and the H2O/DMSO ratio.
 Keywords
PAN;Precipitation polymerization;Molecular weight increase;/DMSO ratio;
 Language
English
 Cited by
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Contribution of the solid phase polymerization to the molecular weight distribution in acrylonitrile precipitation copolymerization,;;;;;

The Korean Journal of Chemical Engineering, 2013. vol.30. 3, pp.746-750 crossref(new window)
1.
Molecular Weight Distribution of Liquid Phase AN and Solid Phase Polymer in Precipitation Polymerization of AN By Changing Solution Composition and Temperature, Carbon letters, 2012, 13, 3, 133  crossref(new windwow)
2.
A New Model and Equation Derived From Surface Tension and Cohesive Energy Density of Coagulation Bath Solvents for Effective Precipitation Polymerization of Acrylonitrile, Carbon letters, 2012, 13, 3, 182  crossref(new windwow)
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Contribution of the solid phase polymerization to the molecular weight distribution in acrylonitrile precipitation copolymerization, Korean Journal of Chemical Engineering, 2013, 30, 3, 746  crossref(new windwow)
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