화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.10, No.3, 135-139, June, 2002
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Extensional and Complex Viscosities of Linear and Branched Polycarbonate Blends
Jung Hoon Park, Jae Chun Hyun, Woo Nyon Kim†, Sung Ryong Kim1, and Seung Chan Ryu1
  • Department of Chemical Engineering, Applied Rheology Center, Korea University, Anam-dong, Seoul 136-701, Korea
  • 1Polymeric Materials Group, Samyang R & D Center, Samyang Corp., Taejeon 305-717, Korea
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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 (Tg) of the L-PC/Br-PC blend was increased with the increase of Br-PC in the blend, and the blend showed a single Tg, 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.
Keywords:polymer blends;polycarbonate;extensional viscosity
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