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Photorefractivity of poly-N-vinylindole-based materials as compared with that of poly-N-vinylcarbazole-based blends
Authors:Angiuli Marco  Ciardelli Francesco  Colligiani Arturo  Greco Francesco  Romano Annalisa  Ruggeri Giacomo  Tombari Elpidio
Affiliation:Istituto per i Processi Chmico-Fisici, Consiglio Nazionla delle Ricerche, Pisa, Italy.
Abstract:The asymmetric two-beam coupling technique has been employed to measure the photorefractivity of thin films of polymer blends containing 2,5-dimethyl-4-(p-nitrophenylazo)anisole as the nonlinear optical component. Poly-(1-vinylindole) and poly-(2,3-dimethyl-1-vinylindole) were the photoconductive polymer counterparts. The values of the photorefractivity are reported. It appears that they are comparable with those of similar blends based on the well-known poly-(9-vinylcarbazole) (PVK), here considered as a reference standard. Careful differential scanning calorimetry analyses have been accomplished on the different blends taken into account to rationalize the significantly longer shelf lifetime of the indolyl-based films with respect to the PVK-based blends.
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