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High Char-Yield in AN-AM Copolymer by Acidic Hydrolysis of Homopolyacrylonitrile
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  • Journal title : Carbon letters
  • Volume 14, Issue 1,  2013, pp.34-39
  • Publisher : Korean Carbon Society
  • DOI : 10.5714/CL.2012.14.1.034
 Title & Authors
High Char-Yield in AN-AM Copolymer by Acidic Hydrolysis of Homopolyacrylonitrile
Cheng, Run; Zhou, You; Wang, Jing; Cheng, Yumin; Ryu, Seungkon; Jin, Riguang;
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Acrylonitrile (AN)-acrylamide (AM) copolymers were prepared by nitric acidic hydrolysis of homopolyacrylonitrile. The acrylamino group increased as a function of hydrolysis time, while crystallinity decreased. Differential scanning calorimetry and a thermal gravimetric analysis indicated that the acylamino introduced by acidic hydrolysis effectively enhanced the cyclization reaction at low temperature due to the change of the cyclization reaction mechanism. Char-yield of AN-AM copolymers also gradually increased with increasing hydrolysis time. The maximum char-yield was 49.48% when hydrolized at in 65% nitric acid solution for 18 h, which was 30% higher than that of non-acidic hydrolysis of homopolyacrylonitrile. Simulation of the practical process also showed an increase of char yields, where the char yields were 55.43% and 62.60% for homopolyacrylonitrile and copolyacrylonitrile, respectively, with a hydrolysis time of 13 h.
polyacrylonitrile;acidic hydrolysis;acrylamide;char-yield;
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