【摘要】 以棉纱和粘胶丝为试料,研究了利用硝酸铵铈为引发剂的纤维素与丙烯腈的接枝共聚。研究各种影响反应的主要参数的结果说明所研究的接聚反应比较容易进行,同时可以选择适当条件使过程中的均聚反应受到抑制。可以认为,接聚反应的发生主要是通过铈离子与纤维素作用在纤维素上生成活性中心。所研究的接聚反应受着反应溶液向纤维素渗透的影响。反应开始进行甚快,但随着接聚或均聚的聚丙烯腈在纤维素表面上生成,使渗透受到阻碍,不同纤维素材料因其精细结构的不同,其接聚反应亦分别达到不同限度。此外,尚曾对所得产品的性能作了初步鉴定。更多还原

【Abstract】 The graft copolymerization of acrylonitrile onto cotton yarn and viscose rayon with eerie ammonium nitrate as initiator has been studied. It was shown that the grafting occured readily and the homopolymerization could be inhibited under proper experimental conditions. The grafting is believed to take place principally through the active centers which are formed on the cellulose substract by the action of eerie ion. It was also shown that the grafting was controlled by the diffusion of the solution to cellulose. The grafting proceeded very rapidly at the begining and then leveled off to a limiting value, depending on the fine structure of the cellulosic material, as a result of the retardation of diffusion by the formation of polyacrylonitrile on the surface of the cellulose. A preliminary estimation was made on the properties of the grafted products.更多还原