Synthesis of Branched Polycarbonate and Properties of Blends with Linear Polycarbonate

Sang Pil Kim; Jae-Sik Lee; Sun-Ho Kim; Bong-Hee Lee; Sang Hern Kim; Whan-Gi Kim

Journal of Industrial and Engineering Chemistry, Vol.5, No.4, 268-273, December, 1999

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Synthesis of Branched Polycarbonate and Properties of Blends with Linear Polycarbonate

Sang Pil Kim, Jae-Sik Lee, Sun-Ho Kim, Bong-Hee Lee¹, Sang Hern Kim^{2, †}, and Whan-Gi Kim³

Sam Yang Group Research Center, Taejon 306-220, Korea
¹Department of Chemical Engineering, Chungbuk National University, Chungbuk 361-763, Korea
²Department of Chemical Technology, Taejon National University of Technology, Taejon 300-717, Korea
³Department of Applied Chemistry, College of Natural Science, Kon-Kuk University, Chungbuk 380-701, Korea

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The relative reactivities for linear and branched polycarbonates prepared from 1,1,1,-tris-p-hydroxyphenylethane (THPE) as a branching agent were investigated in batch reactors. The polymerization was based upon phosgenation, followed by condensation with triethylamine as a catalyst. The relative kinetic studies of branched polycarbonate system showed that the reaction rates in the polycondensation stage were faster than those of the linear polycarbonate. The melt and mechanical properties of the linear/branched polycarbonate blends were also measured. Interestingly, the melt flows showed different behaviors when branched polycarbonate acted as the minor and major components, especially under high shear.

Keywords:branched polycarbonates;polycarbonate blends;melt flow behavior

[References]

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Maxwell B, Nguyen M, Polym. Eng. Sci., 19, 1140 (1979)
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[Related Articles]

[1] Fox DW, Kirk-Othmer Encyclopedia of Chemical Technology, John Wiley & Sons, 18, 479 (1985)

[2] Sehanobish K, Pham HT, Bosnyak CP, Polymeric Materials Encyclopedia, CRC Press, 8, 5697 (1996)

[3] http://www-us.philips.com; http://www-syndir.com

[4] Schenell H, Angew. Chem., 68, 633 (1956)

[5] Schenell H, Chemistry and Physics of Polycarbonate, Interscience, New York (1964)

[6] Mark V, Hedges CV, U.S. Patent, 4,469,861 (1984)

[7] Mark V, Hedges CV, U.S. Patent, 4,446,298 (1984)

[8] Boden EP, Krabbenboft HO, U.S. Patent, 4,888,400 (1989)

[9] Laughner MK, Farah H, U.S. Patent, 5,196,479 (1993)

[10] Maxwell B, Plast. Technol., 10, 12 (1994)

[11] Maxwell B, Plast. Eng., 9, 41 (1987)

[12] Maxwell B, Plast. Technol., 1, 12 (1994)

[13] Maxwell B, Nguyen M, Polym. Eng. Sci., 19, 1140 (1979)

[14] Kim SP, Lee BH, Kim SH, Woo HG, Kim WG, Bull. Korean Chem. Soc., 19(12), 1388 (1998)

[15] Gu JT, Huang SL, J. Polym. Sci. A: Polym. Chem., 40, 555 (1990)