丙烯腈的悬浮聚合

SUSPENSION POLYMERIZATION OF ACRYLONITRILE

<正> 适用于普通溶液纺丝加工成形的聚丙烯腈(PAN)的分子量一般在5—8万范围内,近年来发展起来的冻胶纺丝方法使得(?)>4.0×10~5的超高分子量PAN也可以纺丝成形,成为制备高强高模PAN纤缎的有效方法之一。随着PAN材料应用领域的开拓,合成超高分子量的PAN是一个首要解决的问题。

Ultra high molecular weight polyacrylonitrile of Mw = 4.0~17.8×105 was obtained by suspension polymerization, using azobisisobutyronitrile as initiator and polyvinyl alcohol as suspension agent. The effects of temperature, time, stirring rate, initiator concentration, and monomer to water ratio on the polymerization and the polymer obtained are investigated. By using this method, ultra high molecular weight copolymers of acrylonitrile with methyl acrylate, a-methyl acrylic acid can be also synthesized.