Results 251 to 260 of about 88,383 (304)
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Heterotactic poly(vinyl alcohol)
Journal of Polymer Science: Polymer Chemistry Edition, 1973AbstractBulky substituents in vinyl trialkylsilyl ethers and vinyl trialkylcarbinyl ethers led to heterotactic polymers (H = 66%). The polymers were converted into poly(vinyl alcohol) (PVA) and further to poly(vinyl acetate), and tacticity was determined as poly(vinyl acetate).
Shun‐Ichi Nozakura +4 more
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Photostability of Poly(Vinyl Chloride)/Poly(Vinyl Alcohol) Blends
Molecular Crystals and Liquid Crystals, 2004Photooxidative degradation and photocrosslinking of poly(vinyl chloride), poly(vinyl alcohol)and their blends with different components ratio has been investigated in accelerated laboratory conditions. It was found that PVC is less photostable than PVAL, in which the photocrosslinking is more efficient.
Halina Kaczmarek, And Podgórski
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2009
Abstract Major Applications Paper and textile sizing, oxygen resistant films, adhesives, emulcifiers, colloid stabilizers, base/coatings for photographic films, food wrappings, desalination membranes, electroluminescent devices, and cement coatings, Gels and composites.
P R Sundararajan, Molla Rafiquel Islam
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Abstract Major Applications Paper and textile sizing, oxygen resistant films, adhesives, emulcifiers, colloid stabilizers, base/coatings for photographic films, food wrappings, desalination membranes, electroluminescent devices, and cement coatings, Gels and composites.
P R Sundararajan, Molla Rafiquel Islam
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Studies of alcoholysis of poly (vinyl acetate) to poly (vinyl alcohol)
Journal of Polymer Science: Polymer Symposia, 1974AbstractThe effect of degradation on poly (vinyl acetate) (PVAc) during hydrolysis to poly (vinyl alcohol) is significantly greater with higher molecular weight PVAc than with that of lower molecular weight.There is no data, in literature however, of comparative studies of alcoholysis on commercial samples of PVAc.
Bravar, Mladen +3 more
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Journal of Applied Polymer Science, 2006
AbstractA controlled release profile of salicylic acid (SA) for transdermal administration has been developed. Poly (vinyl alcohol) (PVA) and Poly(vinyl alcohol)/Poly(vinyl pyrrolidone) (PVP) blended preparations were used to prepare the membranes by solvent‐casting technique.
Asman, GÜLSEN, Sanli, Oya, Orhan, Emel
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AbstractA controlled release profile of salicylic acid (SA) for transdermal administration has been developed. Poly (vinyl alcohol) (PVA) and Poly(vinyl alcohol)/Poly(vinyl pyrrolidone) (PVP) blended preparations were used to prepare the membranes by solvent‐casting technique.
Asman, GÜLSEN, Sanli, Oya, Orhan, Emel
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Photochemical reactions in poly(vinyl chloride)/poly(vinyl alcohol) blends
Journal of Photochemistry and Photobiology A: Chemistry, 2005Abstract Poly(vinyl chloride) and poly(vinyl alcohol) (PVAL) blends with various molar ratios were UV-irradiated ( λ = 254 nm) at room temperature and in air atmosphere. Photochemical reactions were monitored by FTIR and UV–vis absorption spectroscopy.
Halina Kaczmarek +2 more
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Polymer Bulletin, 1987
Poly(vinyl alcohol-co-vinyl gallate) was successfully synthesized utilizing an esterification reaction in which poly(vinyl alcohol) was transesterified with methyl gallate under alkaline conditions. Aqueous solutions of this copolymer exhibited a sharp critical micelle concentration value, indicating that surface activity is exhibited by the copolymer.
Gary Jialanella, Irja Piirma
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Poly(vinyl alcohol-co-vinyl gallate) was successfully synthesized utilizing an esterification reaction in which poly(vinyl alcohol) was transesterified with methyl gallate under alkaline conditions. Aqueous solutions of this copolymer exhibited a sharp critical micelle concentration value, indicating that surface activity is exhibited by the copolymer.
Gary Jialanella, Irja Piirma
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Poly-Sugar: Modification of Poly(vinyl Alcohol)
Journal of Macromolecular Science: Part A - Chemistry, 1979Abstract This paper describes the attachment of sugar (sucrose) onto low molecular weight poly(vinyl alcohols) (etherification) to produce a new class of synthetic sweetener. Because of its regulated molecular weight, the new sweetener would pass through the digestive tract and be excreted in its original molecular form. We have termed the new class of
A. M. Usmani, I. O. Salyer
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Sticky poly(vinyl alcohol) hydrogels
Journal of Applied Polymer Science, 1993AbstractLow‐temperature gelation of poly(vinyl alcohol) (PVA) solution was performed in the presence of CaCl2. The resulting PVA hydrogels showed high stickiness and excellent water‐holding ability. These properties became more remarkable with increasing CaCl2 concentration in solvent.
Won‐Ill Cha +3 more
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Nanomagnetic Poly(vinyl alcohol) Hydrogels
Advanced Materials Research, 2013Surface modified magnetic nanoparticles (M-NPs) were synthetized and stabilized in poly (vinyl-alcohol) solution. The solutions with various magnetic nanoparticles contents were gamma-irradiated and magnetic poly (vinyl-alcohol) (M-PVA) hydrogels were synthesized.
Sima Asa'di +2 more
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