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Abstract:
Recently, the polymerization of acetylenic compounds having two or more acetylene units, R-(C triple bond C)n-R'; has attracted much attention and numerous reports have been published. In the case of diacetylenes, n=2, the majority of studies are concerned with the unique topochemical polyzerization in crystalline states. However, little has been studied on the thermal behavior of these polyacetylenic compounds, except for diphenyl diacetylenes, although it is known that many of them simply undergo polymerization on heating. When n is greater than four and R=H, the compounds become unstable and in many cases it is difficult to prevent their polymerization on standing. Jones and his coworkers have synthesized many polyacetylenic compounds including those occurring naturally in plants of Composite family. These polyacetylenes contain four or five conjugated acetylenic units linked to the terminal vinyl groups and are reported to be dangerously unstable. Nakagawa has prepared diphenyltetraacetylene, which is stable in the dark. Korshak et a1. have claimed that a polyyne with a structure H-(C triple bond C)n-H, and stable up to 2300 C was obtained by the oxidative degydropolycondensation of acaetylene. Although the relationships between stability and structure are not yet clear, all of these compounds are interesting as potential heat resisting materials with high carbon contents.
| Pages: |
21 |
| Report Date: |
21 AUG 86 |
| Contract Number: |
AFOSR-82-0007 |
| Report Number: |
A242371 |
Report Unavailable |
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