Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
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The Effect of Oligomer Blending on the Flow Properties of Polycarbonate

  • Cho, Sung-Hwan (Department of Chemical Engineering, Sungkyunkwan University) ;
  • Kim, Sun-Mi (Advanced Polymeric Materials R&D Center, Samyang Corporation) ;
  • Cho, Mi-Suk (Department of Chemical Engineering, Sungkyunkwan University) ;
  • Lee, Young-Kwan (Department of Chemical Engineering, Sungkyunkwan University) ;
  • Kim, Dong-Min (Department of Materials Science and Engineering, Hongik University) ;
  • Kim, Whan-Gi (Department of Applied Chemistry, Konkuk University)
  • Published : 2009.12.25
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Abstract

We successfully prepared high-flow polycarbonate (PC) by blending commercial PC with a low molecular weight PC oligomer. The oligomer was synthesized by the addition of a large quantity of mono functional phenol groups, and the chain end group was reacted with p-tertiary butyl phenol (PTBP) to block the reactivity. The viscosity average molecular weight ($M_v$) for the oligomer was about 4,000-5,000 g/mol, compared to ~19,000 g/mol for the PC blend obtained by blending 10 wt% of the prepared oligomer with the commercial grade PC ($M_v$ of 21,000 g/mol). The blended PC had a melt flow index of 45, which is 2.5 times higher, and a processing temperature that was $20^{\circ}C$ lower, than that of commercial grade PC having a similar $M_v$.

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