Dichroism of stretched poly vinyl alcohol (PVA) foils containing pyridazinium ylids II

Iuliana Stoica; Leonas Dumitrascu; Irina Dumitrascu; Beatrice Carmen Zelinschi; Dana Ortansa Dorohoi

doi:10.1117/12.2063769

22 August 2014 Dichroism of stretched poly vinyl alcohol (PVA) foils containing pyridazinium ylids II

Iuliana Stoica, Leonas Dumitrascu, Irina Dumitrascu, Beatrice Carmen Zelinschi, Dana Ortansa Dorohoi

Proceedings Volume 9286, Second International Conference on Applications of Optics and Photonics; 928615 (2014) https://doi.org/10.1117/12.2063769
Event: Second International Conference on Applications of Optics and Photonics, 2014, Aveiro, Portugal

Abstract

Pyridazinium ylids are zwitterionic compounds with a visible band resulting from an intramolecular charge transfer from the carbanion towards the heterocycle. The degree of order of ylid molecules in polymer matrices can be estimated by the dichroism of thin films. The visible band intensity measured on two perpendicular directions (one parallel and other perpendicular on the film stretching direction) determines the dichroic ratio, a parameter proportional to the relative number of the oriented ylid molecules along the stretching direction. From the spectral study it results that about 53% of ylid molecules are oriented when the degree of stretching is about 4. This kind of studies contributes to establish the mechanism of the orientation of the lateral polymer chains and also can offer information about the direction of the intramolecular electronic transfer responsible for the visible absorption band appearance.

Citation Download Citation

Iuliana Stoica, Leonas Dumitrascu, Irina Dumitrascu, Beatrice Carmen Zelinschi, and Dana Ortansa Dorohoi "Dichroism of stretched poly vinyl alcohol (PVA) foils containing pyridazinium ylids II", Proc. SPIE 9286, Second International Conference on Applications of Optics and Photonics, 928615 (22 August 2014); https://doi.org/10.1117/12.2063769

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