The UV- and heat-induced cis→trans isomerization of undoped polyacetylene (I) [25067-58-7] films was investigated. Temp. and UV light promote the isomerization with a similar mechanism. The formation of paramagnetic defects in trans I takes place by bond rehybridization, in agreement with previous hypotheses, and both spin concn. and spin delocalization depend on the temp. of isomerization. Under UV irradn. thermal cis→trans isomerization of I also takes place at temps. at which the sole thermal treatment isomerization is much lower or nil, so it may be possible to prep. trans-I under relatively mild conditions, leading to a better material.
Thermal- and UV-induced cis/trans isomerization of undoped polyacetylene films. An ESR and IR investigation / Cernia, Enrico; D'Ilario, Lucio; M., Lupoli; E., Mantovani; M., Schwarz; P., Benni; A., Zanobi. - STAMPA. - 22:11(1984), pp. 3393-3399. [10.1002/pol.1984.170221154]
Thermal- and UV-induced cis/trans isomerization of undoped polyacetylene films. An ESR and IR investigation
CERNIA, Enrico;D'ILARIO, LUCIO;
1984
Abstract
The UV- and heat-induced cis→trans isomerization of undoped polyacetylene (I) [25067-58-7] films was investigated. Temp. and UV light promote the isomerization with a similar mechanism. The formation of paramagnetic defects in trans I takes place by bond rehybridization, in agreement with previous hypotheses, and both spin concn. and spin delocalization depend on the temp. of isomerization. Under UV irradn. thermal cis→trans isomerization of I also takes place at temps. at which the sole thermal treatment isomerization is much lower or nil, so it may be possible to prep. trans-I under relatively mild conditions, leading to a better material.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
