All the yellow polyacetylene derivatives studied maintain a linear structure and give small yields of volatile material during thermal decomposition if the heating rate is small (∼2 deg/min). Heat treatment at high temperatures does not produce carbonization, but gives open carbon forms. Raising the heating rate to 8 deg/min produces violent decomposition with large yields of volatile material (up to ∼98%), at relatively low temperatures.
A study of the electrophysical properties of the initial and heat treated polyacetylene derivatives shows that these substances are semiconductors with an activation energy for the conductivity of ∼1.0-0.1 eV.
The structure of the polymers is characterized by aggregation into packets of parallel molecular chains having a high degree of azimuthal ordering, which depends on having orienting phenyl, anthracene, and pyridine groups in the chain. Adding phenyl groups to the ends of the molecules produces longitudinal ordering and a crystal structure with space ordering of the atoms in the packets.
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V. V. Korshak, V. I. Kasatochkin, A. M. Sladkov, Yu. P. Kudryavtsev, and K. Usenbaev, Dokl. AN SSSR,136, 1342 (1961).
V. V. Korshak, A. M. Sladkov, and Yu. P. Kudryavtsev, Vysokomolek, soed.,2, 1824 (1960).
V. V. Korshak, A. M. Sladkov, and Yu. P. Kudryavtsev, Dokl. AN SSSR,144, 115 (1962).
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Kasatochkin, V.I., Sladkov, A.M., Kudryavtsev, Y.P. et al. The properties of polyacet ylenes. Russ Chem Bull 12, 1622–1626 (1963). https://doi.org/10.1007/BF00845789
- Activation Energy
- Heat Treatment
- Thermal Decomposition