title: Birefringence and dichroism of poly(vinyl-alcohol) foils containing phthalazinium ylids.
abstract: Pure and colored with phthalazinium ylids poly(vinyl-alcohol) (PVA) foils were stretched under gentile heating. The birefringence of the thin foils was determined with a Babinet compensator standardized for yellow radiation of a Sodium lamp. The determined birefringence of the colored PVA foils is higher than that of the pure PVA foils. This fact indicates that the phthalazinium ylids facilitate the increase in the anisotropy of the stretched foils. The visible absorption electronic band of phthalazinium ylids was used to estimate the dichroic ratio and the degree of order of the ylid molecules in the stretched PVA foils. An increase in dichroism and birefringence with the degree of stretching has been evidenced for uncolored and colored PVA foils.
authors.affiliation: Alexandru Ioan Cuza University, Faculty of Physics, 11 Carol I Blv., Iasi, RO-700506, Romania.
authors.forename: Alina
authors.initials: A
authors.lastname: Rogojanu
authors.forename: Carmen Felicia
authors.initials: CF
authors.lastname: Dascalu
authors.forename: Beatrice Carmen
authors.initials: BC
authors.lastname: Zelinschi
authors.forename: Maria
authors.initials: M
authors.lastname: Caprosu
authors.forename: Dana Ortansa
authors.initials: DO
authors.lastname: Dorohoi
mesh_terms: D000438:Alcohols / Q000737:chemistry; D001718:Birefringence; D002942:Circular Dichroism; D009682:Magnetic Resonance Spectroscopy; D008954:Models, Biological; D010793:Phthalazines / Q000737:chemistry*; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties
chemical_list: D000438:Alcohols; D010793:Phthalazines; D011142:Polyvinyl Alcohol