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

Publication history: Received June 10, 2014
Accepted November 23, 2014

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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Formation of compositional gradient profiles by using shear-induced polymer migration phenomenon under Couette flow field

Sang Hyuk Im Su Jin Lee Duck Jong Suh¹ O Ok Park^1† Moo Hyun Kwon²

Functional Crystallization Center, Department of Chemical Engineering, Kyung Hee University, 1732, Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi 446-701, Korea ¹Department of Chemical and Biomolecular Engineering (BK21+ Graduate Program), Korea Advanced Institute of Science and Technology (KAIST), 291, Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea ²Department of Applied Chemistry, Woosuk University, 443, Samrae-ro, Sangrae-eup, Wanju-gun, Jeonbuk 565-701, Korea

ookpark@kaist.ac.kr

Korean Journal of Chemical Engineering, July 2015, 32(7), 1422-1426(5), 10.1007/s11814-014-0344-4

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Abstract

We investigated whether a graded-index profile, specified by the polymer compositional gradient, could be formed using shear-induced polymer migration phenomenon in a polymer solution. For the presented model system, we generated a shear flow by rotating a glass rod at the center of a polystyrene/methylmethacrylate (PS/MMA) solution and measured the degree of polymer migration by the shear flow field by examining the concentration of polymer solution along the radial direction from the rotating axis to the periphery. Through model experiments, we formed a compositional gradient and controlled its profile in the solution by varying the concentration of polymer solution, molecular weight of polymer, and shear rate. Finally, we solidfied the gradient profiles by the polymerization of the PS/MMA solution and confirmed that the gradient profiles were maintained with a compositional gradient twice larger than the mother PS/MMA solution.

Keywords

Graded Index Compositional Gradient Polymer Migration Polymer Optical Fiber

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