Organic dye impregnated poly(vinyl alcohol) nanocomposite as an efficient optical limiter: structure, morphology and photophysical properties

2013 ◽  
Vol 1 (24) ◽  
pp. 3851 ◽  
Author(s):  
S. Sreeja ◽  
S. Sreedhanya ◽  
N. Smijesh ◽  
Reji Philip ◽  
C. I. Muneera
Keyword(s):  
Vinyl Alcohol ◽  
Photophysical Properties ◽  
Organic Dye ◽  
Poly Vinyl Alcohol ◽  
Optical Limiter ◽  
Structure Morphology

scholarly journals Physically Crosslinked Poly (Vinyl Alcohol)/Kappa-Carrageenan Hydrogels: Structure and Applications

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 560 ◽  
Author(s):  
Catalin Croitoru ◽  
Mihai Alin Pop ◽  
Tibor Bedo ◽  
Mihaela Cosnita ◽  
Ionut Claudiu Roata ◽  
...  
Keyword(s):  
Polymer Matrix ◽  
Diffusion Coefficients ◽  
Vinyl Alcohol ◽  
Weight Ratio ◽  
Poly Vinyl Alcohol ◽  
Distilled Water ◽  
Cationic Dye ◽  
Structure Morphology ◽  
Physically Crosslinked ◽  
Kappa Carrageenan

This paper discusses the structure morphology and the thermal and swelling behavior of physically crosslinked hydrogels, obtained from applying four successive freezing–thawing cycles to poly (vinyl alcohol) blended with various amounts of κ-carrageenan. The addition of carrageenan in a weight ratio of 0.5 determines a twofold increase in the swelling degree and the early diffusion coefficients of the hydrogels when immersed in distilled water, due to a decrease in the crystallinity of the polymer matrix. The diffusion of water into the polymer matrix could be considered as a relaxation-controlled transport (anomalous diffusion). The presence of the sulfate groups determines an increased affinity of the hydrogels towards crystal violet cationic dye. A maximum physisorption capacity of up to 121.4 mg/g for this dye was attained at equilibrium.

Synthesis and photophysical properties of a covalently bonded palladiummeso-sulfophenylporphyrin-poly(vinyl alcohol)polymer with potential applications as an oxygen sensor

2006 ◽  
Vol 10 (02) ◽  
pp. 87-95 ◽  
Author(s):  
Mariette M. Pereira ◽  
Francisco Ruano ◽  
M. Emília D. G. Azenha ◽  
Hugh D. Burrows ◽  
Maria G. M. Miguel ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Vinyl Alcohol ◽  
Oxygen Sensor ◽  
Heterogeneous Media ◽  
Photophysical Properties ◽  
Poly Vinyl Alcohol ◽  
Phosphorescence Lifetime ◽  
Phosphorescence Quenching ◽  
Covalently Bonded ◽  
Solid Film

The synthesis and photochemical characterization of a covalently bonded palladium meso-sulfophenylporphyrin-poly(vinyl alcohol)polymer ( PVA - PdTPPS ), made via reaction of the chlorosulfonyl derivative of Pd meso-tetrakis-phenylporphyrin with the alcohol group of the polymer to form the sulfonate ester, is described. Absorption, emission and phosphorescence lifetime data are reported. In both the solid film and in aqueous solution phosphorescence decays in the absence of oxygen are non-monoexponential and suggest heterogeneity in the decay and oxygen quenching kinetics. As a solid film there is very little phosphorescence quenching by oxygen at moderate pressures of O2(0-30 Torr), but in aqueous solution oxygen quenches at a rate of 7.5 (±0.5) × 108M . s−1. The synthetic route described is versatile enough to be used with a variety of metalloporphyrins and polymers and this allows the possibility of extensive tuning in terms of lumophore lifetime, polarity, solubility, location in heterogeneous media, and compatibility with other polymers.

An organic dye-polymer (phenol red-poly (vinyl alcohol)) composite architecture towards tunable -optical and -saturable absorption characteristics

2016 ◽  
Vol 119 (19) ◽  
pp. 193106 ◽  
Author(s):  
Sreeja Sreedhar ◽  
Navas Illyaskutty ◽  
S. Sreedhanya ◽  
Reji Philip ◽  
C. I. Muneera
Keyword(s):  
Vinyl Alcohol ◽  
Organic Dye ◽  
Poly Vinyl Alcohol ◽  
Saturable Absorption ◽  
Phenol Red ◽  
Absorption Characteristics
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