화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korea-Australia Rheology Journal, Vol.19, No.1, 1-5, March, 2007
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Rheological properties of branched polycarbonate prepared by an ultrasound-assisted intensive mixer
Hyungsu Kim1, 2, †, Hooseok Lee1, 3, and Jae Wook Lee1, 3
  • 1Applied Rheology Center, Korea
  • 2Department of Chemical Engineering, Dankook University, Hannam-Dong, Yongsan-Gu, Seoul 140-714, Korea
  • 3Department of Chemical and Biomolecular Engineering, Sogang University, 1 Shinsu-Dong, Mapo-Gu, Seoul 121-742, Korea
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By combining ultrasonic energy which is essential for the chain scission of polymer molecules and a multifunctional agent (MFA) having double bonds at its ends, we were able to modify the molecular structure of polycarbonate (PC) from linear to a branched structure during melt processing. The three double bonds in chain ends of MFA were expected to act as sites for trapping macroradicals of PC during the course of ultrasound-assisted mixing process. The transformation of molecular structure of PC was confirmed by the measurements of rheological properties of the modified PC. After the ultrasonic irradiation of PC together with MFA, increase in complex viscosities and shear-thinning behavior were observed. The Cole-Cole plot and measurement of extensional viscosities revealed the characteristic features of branched structure with well-defined extensional behavior which is comparable to that of a commercial branched PC.
Keywords:branched polycarbonates;ultrasound;melt mixing;multifunctional agent
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