Determination of Molecular Weight and its Distribution of Flexible Chain Polymer by Phase-Modulated Flow Birefringence Technique

Yum Rak Oh; Moo Hyun Kwon; O Ok Park

Korean Journal of Chemical Engineering, Vol.19, No.2, 331-336, March, 2002

Yum Rak Oh, Moo Hyun Kwon¹, and O Ok Park^{2, †}

Hankook Tire Co., Ltd., Daejeon 305-343, Korea
¹Department of Chemical Engineering, Woosuk University, Chonbuk 565-701, Korea
²Dept. of Chem. Eng., KAIST, 373-1 Kusong-dong, Yusong-gu, Daejeon 305-701, Korea

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The objective of this study is to develop a systematic method to determine molecular weight and its distribution of flexible chain polymer by birefringence experiments. Using the random walk model, birefringence Δn and orientation angle χ have been optically obtained as functions of molecular weights. To confirm the theory, polystyrene solutions with different molecular weights dissolved in polychlorinated biphenyl were experimented by the phase-modulated flow birefringence (PMFB) method. Birefringence of polystyrene solutions is proportional to (∑ciMi(1.6))γ(2), and cot(2χ) to (∑ciMi(1.6)/B1∑ciMi(-0.2))γ. The experimental results agreed well with the theoretical predictions proposed in this study.

Keywords:Flexible Chain Polymer;Polystyrene;Birefringence;Orientation Angle;Molecular Weight

[References]

Frattini PL, Fuller GG, J. Rheol., 28, 61 (1984)
Janeschitz-Kriegl H, Adv. Polymer Sci., 6, 178 (1969)
Kwon MH, Lee YS, Park OO, Korean J. Chem. Eng., 16(2), 265 (1999)
McGrory WJ, Tuminello WH, J. Rheol., 34, 867 (1990)
Nunes RW, Martin JR, Johnsons JF, Polym. Eng. Sci., 22(4), 193 (1982)
Oh YR, Park OO, J. Chem. Eng. Jpn., 25(3), 243 (1992)
Oh YR, Lee YS, Kwon MH, Park OO, J. Polym. Sci. B: Polym. Phys., 38(4), 509 (2000)
Park OO, Kim SW, Park CI, Yang SM, Korean J. Chem. Eng., 18(3), 317 (2001)
PARK OO, Korean J. Chem. Eng., 6(4), 282 (1989)
Peterlin A, J. Chem. Phys., 39, 224 (1963)
Wu S, Polym. Eng. Sci., 25(2), 122 (1985)
Zimm BH, J. Chem. Phys., 24, 269 (1956)

[Related Articles]

[1] Frattini PL, Fuller GG, J. Rheol., 28, 61 (1984)

[2] Janeschitz-Kriegl H, Adv. Polymer Sci., 6, 178 (1969)

[3] Kwon MH, Lee YS, Park OO, Korean J. Chem. Eng., 16(2), 265 (1999)

[4] McGrory WJ, Tuminello WH, J. Rheol., 34, 867 (1990)

[5] Nunes RW, Martin JR, Johnsons JF, Polym. Eng. Sci., 22(4), 193 (1982)

[6] Oh YR, Park OO, J. Chem. Eng. Jpn., 25(3), 243 (1992)

[7] Oh YR, Lee YS, Kwon MH, Park OO, J. Polym. Sci. B: Polym. Phys., 38(4), 509 (2000)

[8] Park OO, Kim SW, Park CI, Yang SM, Korean J. Chem. Eng., 18(3), 317 (2001)

[9] PARK OO, Korean J. Chem. Eng., 6(4), 282 (1989)

[10] Peterlin A, J. Chem. Phys., 39, 224 (1963)

[11] Wu S, Polym. Eng. Sci., 25(2), 122 (1985)

[12] Zimm BH, J. Chem. Phys., 24, 269 (1956)