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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received March 6, 2001
Accepted July 26, 2001

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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

Yum Rak Oh Moo Hyun Kwon¹ 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

oopark@sorak.kaist.ac.kr

Korean Journal of Chemical Engineering, March 2002, 19(2), 331-336(6), 10.1007/BF02698424

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Abstract

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 _x000D_ (∑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

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