DIRECT IMAGING OF THE DIACETYLENE SOLID-STATE MONOMER-POLYMER PHASE-TRANSFORMATION

被引:20
作者
LIAO, J [1 ]
MARTIN, DC [1 ]
机构
[1] UNIV MICHIGAN,COLL ENGN,DEPT MAT SCI & ENGN,ANN ARBOR,MI 48109
关键词
D O I
10.1126/science.260.5113.1489
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The solid-state phase transformation from 1,6-di(N-carbazolyl)-2-4-hexadiyne (DCHD) diacetylene monomer to polymer has been studied dynamically by low-dose selected area electron diffraction and high-resolution electron microscopy. The total exposure required to induce polymerization is five orders of magnitude smaller than the critical dose for electron beam damage. The phase transformation is quasi-homogeneous, with the lattice parameters changing continuously as a function of beam dose. Characteristic streaking that develops in the selected area electron diffraction patterns in the [200] reciprocal directions during the intermediate stages of the transformation provides information about the defect-mediated mechanisms of this reaction.
引用
收藏
页码:1489 / 1491
页数:3
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