• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>journal of applied polymer science >A simple method for determining water‐induced gelling times of isocyanate prepolymers
【24h】

A simple method for determining water‐induced gelling times of isocyanate prepolymers

机译：A simple method for determining water‐induced gelling times of isocyanate prepolymers

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相关主题

摘要

AbstractA spectral assay has been developed that permits reliable determination of polymer gelling times. Water‐soluble, isocyanate‐containing polyether prepolymers initiate chain extension on contact with water and after some period of time form a semisolid hydrogel matrix. Techniques based on visual observations used to determine the end point for this process generally produce erratic results. By following scattered transmittance of visible light by an aqueous solution of prepolymer during the gelation process, it is possible to obtain a more objective determination of the gelation time. It was empirically demonstrated that the minimum of the first derivative of the scattered transmittance versus time spectrum correlated with the observed gel time over a wide time scale. © 1993 John WileySons,

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