首页> 外文期刊>journal of applied polymer science >Synthesis of nonionic flocculants by gamma irradiation of mixtures of polyacrylamide and poly(ethylene oxide)
【24h】

Synthesis of nonionic flocculants by gamma irradiation of mixtures of polyacrylamide and poly(ethylene oxide)

机译:Synthesis of nonionic flocculants by gamma irradiation of mixtures of polyacrylamide and poly(ethylene oxide)

获取原文
           

摘要

AbstractThe synthesis of polyacrylamide (PAM) graft poly(ethylene oxide) (PEO) has been investigated and the reaction conditions were varied by gamma irradiation to optimize polystyrene latex flocculation by the copolymers. The effects of the gamma ray dosage, the PEO chain length, the ratio of PEO to PAM, and the crosslinking degree of copolymer were studied. The most effective flocculant was obtained by exposing a mixture of 1.2 wt PAM (Mw= 5 × 106) and 0.94 wt PEO (Mw= 5000) to 816 krad of gamma radiation. The resulting copolymer contained 24 wt PEO. Crosslinking to give insoluble gels was an undesirable side reaction increased with γ‐ray dose and decreased with PEO addition. The most effective flocculants contained more than 15 wt PEO with little crosslinking. The grafting behavior of triblock copolymer, poly(ethylene oxide)‐b‐poly(propylene oxide)‐b‐poly(ethylene oxide) (EmPnEm, wheremandnare oxyethylene and oxypropylene unit, respectively), onto PAM by gamma radiation was also studied; grafting occurred but effective flocculants were not obtained. © 1994 John Wil

著录项

获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号