• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国政府科技报告 >Molecular Mechanics of Photopolymerization of 2,5-Distyrylpyrazine in Solid state
【24h】

Molecular Mechanics of Photopolymerization of 2,5-Distyrylpyrazine in Solid state

机译：2,5-二苯乙烯吡嗪固态光聚合的分子力学

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

摘要

The molecular mechanics of photopolymerization of 2,5-distyrylpyrazine in the solid-state alpha form is investigated by a combination of Raman and electronic spectroscopic techniques. A stepwise photoreaction is used to stabilize an intermediate oligomer structure. For this purpose, the 476.5-nm argon-ion laser line is used to convert the monomer to the oligomer. The Raman phonon spectra reveal a homogeneous mechanism, with considerable lattice rearrangement, for the oligomerization process, which is also found to produce lattice strain. Further photoreaction of the oligmer is carried out with light of wavelength < or = 400 nm from a 200-W mercury-xenon lamp as well as with the 355- and 417-nm laser lines from a Nd:Yag laser system. The Raman phonon spectra, monitored during the conversion of the oligmer to the polymer, show that initially the process starts homogeneously, with considerable lattice rearrangement. Then it turns heterogeneous, with a phase separation spectra accompanied by a gradual ordering of the polymer product lattice. The electronic absorption spectra of the monomer are characterized and related to the stepwise photoprocess discussed above. Although the emission spectra show a monotonic change during the photoreaction, energy transfer from the oligomer to the monomer and from the polymer to the oligomer obscures any quantitative characterization by emission spectroscopy.

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