Synthesis and Gas Permeability of Block Copolymers Composed of Poly(styrene-co-acrylonitrile) and Polystyrene Blocks

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Title:Synthesis and Gas Permeability of Block Copolymers Composed of Poly(styrene-co-acrylonitrile) and Polystyrene Blocks
Creators:
Lokaj, Jan
Brožová, Libuše
Holler, Petr
Pientka, Zbyněk
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 67, 2, pp. 267-278
Uncontrolled Keywords:Azeotropic styrene-acrylonitrile copolymers, Block copolymers, Gas transport, Radical polymerizations, Polymer films, Nitroxide-mediated copolymerization

Abstract

Radical copolymerization of a mixture of styrene (S) and acrylonitrile (AN) at azeotropic composition (63 mole % of S and 37 mole % of AN) at 125 °C in the presence of dibenzoyl peroxide and 2,2,6,6-tetramethylpiperidin-1-yloxyl (TEMPO) gave TEMPO-terminated S-AN copolymers with narrow molecular weight distributions. Both the linear semilogarithmic time-conversion and molecular weight-conversion dependences indicated a quasiliving copolymerization process. Polymerization of styrene initiated with the synthesized macroinitiators containing reversibly bound terminal TEMPO groups yielded film-forming poly(styrene-<i>co</i>-acrylonitrile)-<i>block</i>-polystyrene copolymers. Using the resulting diblock copolymer as a macroinitiator in copolymerization of S and AN, a triblock copolymer of the A-B-A type was obtained. Films of the block copolymers were prepared by casting chloroform solutions and their permeabilities (<i>P</i>) to nitrogen, oxygen, methane, carbon dioxide, and hydrogen were determined. The films showed high selectivities to oxygen (<i>P</i><sub>O2</sub>/<i>P</i><sub>N2</sub> &gt; 6). The block copolymers behaved as single-phase homogeneous materials. <p>

Title:Synthesis and Gas Permeability of Block Copolymers Composed of Poly(styrene-co-acrylonitrile) and Polystyrene Blocks
Creators:
Lokaj, Jan
Brožová, Libuše
Holler, Petr
Pientka, Zbyněk
Uncontrolled Keywords:Azeotropic styrene-acrylonitrile copolymers, Block copolymers, Gas transport, Radical polymerizations, Polymer films, Nitroxide-mediated copolymerization
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:67
Number:2
Page Range:pp. 267-278
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc20020267UNSPECIFIED
ID Code:1920
Item Type:Article
Deposited On:06 Feb 2009 17:13
Last Modified:06 Feb 2009 16:14

Citation

Lokaj, Jan; Brožová, Libuše; Holler, Petr; Pientka, Zbyněk (2002) Synthesis and Gas Permeability of Block Copolymers Composed of Poly(styrene-co-acrylonitrile) and Polystyrene Blocks. Collection of Czechoslovak Chemical Communications, 67 (2). pp. 267-278. ISSN 0010-0765

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