The effect of poly(vinyl alcohol) on the photophysical properties of pyronin dyes in aqueous solution: A spectroscopic study

2013 ◽  
Vol 101 ◽  
pp. 306-313 ◽  
Author(s):  
Bahri Gür ◽  
Kadem Meral
Keyword(s):  
Aqueous Solution ◽  
Spectroscopic Study ◽  
Vinyl Alcohol ◽  
Photophysical Properties ◽  
Poly Vinyl Alcohol

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.

Multiporous open-cell poly(vinyl formal) foams for sound absorption

RSC Advances ◽  
2016 ◽  
Vol 6 (9) ◽  
pp. 7653-7660 ◽  
Author(s):  
Bai Xue ◽  
Jianguo Deng ◽  
Junhua Zhang
Keyword(s):  
Aqueous Solution ◽  
Vinyl Alcohol ◽  
Sound Absorption ◽  
Poly Vinyl Alcohol ◽  
Open Cell

A series of multiporous open-cell poly(vinyl formal) (PVF) foams were obtained by crosslinking poly(vinyl alcohol) (PVA) with different contents of formaldehyde in aqueous solution.

Novel pH-Sensitive Poly(Vinyl Alcohol) Based Polyampholyte as Pervaporation Membrane

2016 ◽  
Vol 852 ◽  
pp. 979-983
Author(s):  
Ping Rui Meng ◽  
Liang Bo Li
Keyword(s):  
Aqueous Solution ◽  
Vinyl Alcohol ◽  
Water Resistance ◽  
Graft Copolymerization ◽  
Sodium Acrylate ◽  
Poly Vinyl Alcohol ◽  
Permeate Flux ◽  
Ft Ir ◽  
Ethanol Aqueous Solution ◽  
Poly Acrylamide

Sodium acrylate (NaAA) and acrylamide (AM) were grafted onto poly (vinyl alcohol) (PVA) using potassium persulfate as an initiator, Graft copolymerization namely poly (vinyl alcohol)-g-poly (acrylamide/sodium acrylate) (PVA-g-PAM/SAC). The poly (vinyl alcohol)-g-poly (vinylamine/sodium acrylate) (PVAMC) was prepraed by Hofmann rearrangement.The PVAMC homogeneous membrane was characterized by fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM).The water resistance of the PVAMC membranes is the best when pH of the PVAMC solutions was 4, at that time the numbers of-NH3+ and-COO- groups trended to be equal, so the isoelectric point was pH=4. At 90 °C the pervaporation of PVAMC composite membrane was tested and showed that the separation factor and the permeate flux were about 1001 and 1341 g/(m2·h) for 90wt% ethanol aqueous solution, and they were about 1297 and 1040 g/(m2·h) for 90wt% isopropanol aqueous solution.

Effect of ZnO nanoparticles on the electrospinning of poly(vinyl alcohol) from aqueous solution: Influence of particle size

2013 ◽  
Vol 54 (9) ◽  
pp. 1969-1975 ◽  
Author(s):  
Tongsai Jamnongkan ◽  
Ryo Shirota ◽  
Sathish K. Sukumaran ◽  
Masataka Sugimoto ◽  
Kiyohito Koyama
Keyword(s):  
Aqueous Solution ◽  
Particle Size ◽  
Zno Nanoparticles ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol

scholarly journals DYNAMICAL ASPECTS OF SOL-GEL TRANSITION IN AN AQUEOUS SOLUTION OF POLY (VINYL ALCOHOL)

1984 ◽  
Vol 40 (4-5) ◽  
pp. T158-T160
Author(s):  
Motoko Komatsu ◽  
Takashi Inoue ◽  
Keizo Miyasaka
Keyword(s):  
Aqueous Solution ◽  
Vinyl Alcohol ◽  
Sol Gel ◽  
Poly Vinyl Alcohol ◽  
Sol Gel Transition ◽  
Gel Transition
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