Journal of the Korean Applied Science and Technology (한국응용과학기술학회지)

The Korean Society of Applied Science and Technology (한국응용과학기술학회)
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Solution Viscosity and Relative Reactivity of Branched and Linear Polycarbonates

  • Kim, Sang-Pil (Sam Yang Group Research Center) ;
  • Lee, Bong-Hee (Department of Chemical Engineering, Chungbuk National University) ;
  • Kim, Sang-Hern (Department of Chemical Technology, Taejon National University of Technology) ;
  • Kim, Whan-Gi (Department of Applied Chemistry, College of Natural Science, Kon-Kuk University)
  • Published : 2000.06.30
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Abstract

The relative reactivities of branched and linear polycarbonates were investigated by measuring unreacted chloroformate concentration. It was found that the polymerization for the branched polymer proceeded ca. 10 times faster than that for the linear polymers. The effect of catalyst on a condensation step was studied by changing the amount of TEA (triethylamine) at $t_{0}$ and $t_{60}$ with keeping constant amount of TEA. The viscosity average molecular weight for the obtained branched polycarbonates were measured and compared with those of linear polycarbonates. It was found that the viscosity molecular weights of the obtained polymers decreased nonlinearly as wt % of added oligomer increased. The solution viscosities in methylenechloride for linear and branched polycarbonate increased nonlinearly as the content of polymer increased.

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