Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
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Extensional and Complex Viscosities of Linear and Branched Polycarbonate Blends

  • Park, Jung-Hoon (Department of Chemical Engineering, Applied Rheology Center, Korea University) ;
  • Hyun, Jae-Chun (Department of Chemical Engineering, Applied Rheology Center, Korea University) ;
  • Kim, Woo-Nyon (Department of Chemical Engineering, Applied Rheology Center, Korea University) ;
  • Kim, Sung-Ryong (Polymeric Materials Group, Samyang R&D Center, Samyang Corp.) ;
  • Ryu, Seung-Chan (Polymeric Materials Group, Samyang R&D Center, Samyang Corp.)
  • Published : 2002.06.01
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Abstract

Blends of the linear bisphenol-A polycarbonate (L-PC) and randomly branched bisphenol-A polycarbonate (Br-PC), prepared by co-rotating twin screw extrusion, were investigated using differential scanning calorimetry (DSC), sag resistance time tester, extensional rheometry, and advanced rheometric expansion system (ARES). From the DSC results, the glass transition temperature (T$_{g}$) of the L-PC/Br-PC blend was increased with the increase of Br-PC in the blend, and the blend showed a single T$_{g}$, which suggests a miscible blend. The sag resistance time of the L-PC/Br-PC blend was increased with the increase of Br-PC in the blends. From the results of rheological measurements of the L-PC/Br-PC blends, the extensional viscosity and the complex viscosity of the blends were found to increase with the increase of Br-PC in the blends. The increase of extensional viscosity and complex viscosity was related with the increase of sag resistance time with the Br-PC in the L-PC/Br-PC blends.nds.

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