OPTICAL AND SPECTROSCOPIC PROPERTIES OF A NOVEL POLYCARBAZOLYLDIACETYLENE

Some unsymmetrical diacetylenic monomers containing a carbazolyl group directly attached to the diacetylene skeleton as well as a flexible p olar side group were synthesized Thermal polymerization of the monomer s was followed by means of electronic and infrared absorptions and rea sonably high monomer-to-polymer conversion was observed in all cases. A detailed study of the evolution of the electronic, infrared and Rama n spectra during the polymerization process is here reported for the m onomer exa-3,5-diynil-N-[(ethoxycarbonyl)methyl]carbamate (2U1E) which shows the highest polymerization rate. The results are consistent wit h the formation of two polymeric forms. At short polymerization time, a form associated with an excitonic band at 660 nm is observed which e volves into another polymer structure with the excitonic peak shifted to 620 nm.