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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 19, 2012
Accepted November 3, 2012

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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Contribution of the solid phase polymerization to the molecular weight distribution in acrylonitrile precipitation copolymerization

Shuang Kun Zhang Wei Wei Liu Hui Bo Zhang Seung Kon Ryu¹ Ri Guang Jin^†

State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 10029, China ¹Jeonju Institute of Machinery and Carbon Composites, Jeonju-si 561-844, Korea

jin.riguang@163.com

Korean Journal of Chemical Engineering, March 2013, 30(3), 746-750(5), 10.1007/s11814-012-0183-0

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Abstract

Molecular weight distribution of copolyacrylonitrile, which was obtained from precipitation copolymerization without and with using dispersants in mixed solution, is studied. The contribution ratio of liquid phase polymerization and solid phase polymerization under different polymerization conditions could be worked out through the formula, which has been deduced in literature. From the calculated results, common points of each reaction system are, i) contribution_x000D_ ratio (r) of solid phase to liquid phase decreases with the increase of water content; thus the solid phase polymerization is gradually strengthened, which is apt to form chain of high molecular weight, ii) the higher temperature leads to higher compatibility between water and DMSO; thus the solid phase polymerization contribution would decrease, while the value of r is considerably larger. The limit molecular weight distribution of the system without dispersants in 100% water is approaching to 2; thus the corresponding r becomes larger, the molecular weight distribution ratio (Q) decreases in the system with dispersants.

Keywords

Molecular Weight Distribution Polyacrylonitrile Precipitation Polymerization Contribution Ratio of Liquid Phase and Solid Phase Polymerization

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