• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国政府科技报告 >Interdiffusion at the bilayer polymer interface: Evidence for reptation.
【24h】

Interdiffusion at the bilayer polymer interface: Evidence for reptation.

机译：双层聚合物界面的相互扩散：蠕动的证据。

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

摘要

Neutron reflection is used to study the interdiffusion in equal molecular weight polystyrene bilayer melts with a spatial resolution of 1nm. Interfacial widths and concentration profiles at the bilayer interface are obtained for annealing times up to and beyond the time (reptation time, (tau)(sub d)) in which the molecule has moved by its own length. For annealing times t < (tau)(sub d), the reptation model predicts a mean square displacement of monomers whose time evolution is a power law. The detailed profile is expected to exhibit a discontinuity (sharp gradient) of density at the interface between the two polymers. For relatively light weight polymers of M (approx) 233,000, the mean square displacements of monomers is in general agreement with reptation predictions; the discontinuity at the interface is only observed when the molecular weights are large, M (approx) 1,000,000. The discontinuity is present even for low concentrations of the deuterated polymer where isotopic slowing down effects are negligible, thus confirming the sharp gradient as being due to reptation. 19 refs., 5 figs.

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
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