| Autor: |
Enkelmann, V., Leyrer, R. J., Schleier, G., Wegner, G. |
| Zdroj: |
Journal of Materials Science; January 1980, Vol. 15 Issue: 1 p168-176, 9p |
| Abstrakt: |
The solid-state polymerization of 1,6-di(N-carbazolyl-2,4-hexadiyne (DCH) giving rise to macroscopic single crystals of the corresponding polymer is described with regard to structural aspects. The crystal structures of the monomer and polymer are discussed with respect to the observed solid-state reactivity. An autocatalytic acceleration in the conversion-time characteristics of the radiation-induced polymerization is attributed to a non-destructive phase transition as indicated by a sudden change in the lattice parameters and the elastic constants of the polymerizing crystal. The same phase transition occurs with destruction of the parent lattice during thermal polymerization. The Young's modulus in the chain direction of radiation-polymerized crystals reaches the theoretical value expected for infinitely long polymer chains. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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