Results 251 to 260 of about 89,235 (304)
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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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On the viscoelastic properties of poly(vinyl alcohol) and chemically crosslinked poly(vinyl alcohol)
Journal of Applied Polymer Science, 2001AbstractPoly(vinyl alcohol)(PVA) films chemically crosslinked with glutaraldehyde(GA) in the presence of HCl were prepared by casting from aqueous solutions. The PVA and PVA gels were investigated by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and dynamic mechanical analysis (DMA); their swelling characteristics and ...
Jun‐Seo Park +2 more
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Journal of Polymer Science Part A-1: Polymer Chemistry, 1972
AbstractIt is a common view that poly(vinyl acetate) has many branches at the acetyl side group, but that the corresponding poly(vinyl alcohol) has little branching. In order to study the branching in poly(vinyl acetate) and poly(vinyl alcohol) which is formed by chain transfer to polymer, the polymerization of 14C‐labeled vinyl acetate in the presence
Shun‐Ichi Nozakura +2 more
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AbstractIt is a common view that poly(vinyl acetate) has many branches at the acetyl side group, but that the corresponding poly(vinyl alcohol) has little branching. In order to study the branching in poly(vinyl acetate) and poly(vinyl alcohol) which is formed by chain transfer to polymer, the polymerization of 14C‐labeled vinyl acetate in the presence
Shun‐Ichi Nozakura +2 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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Characterization of poly(vinyl alcohol)
Journal of Applied Polymer Science, 1985AbstractMolecular weight distributions, long chain branching frequency, and solution viscosities of samples of commercial poly(vinyl alcohol) (PVA) are reported. The PVA was fully reacetylated to poly(vinyl acetate) (PVAc) for characterizations by size exclusion chromatography using a low angle light scattering detector.
Daniele C. Bugada, Alfred Rudin
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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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Biodegradability of poly(vinyl alcohol)
Polymer Engineering & Science, 1999AbstractPlastic waste increases at a rate of several tons per year and the time required for their biodegradation is often unknown. The Phanerochaete chysosporium fungus oxidizes a wide variety of toxic organic compounds to nontoxic compounds or CO2 and H2O.
O. Betty Lucy López +2 more
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Use of poly(vinylpyrrolidone) and poly(vinyl alcohol) for cryoultramicrotomy
The Histochemical Journal, 1989Specimens infused with or suspended in a mixture of 10-30% poly(vinylpyrrolidone) and 2.07-1.61 M sucrose can often be more easily frozen-sectioned than those infused with sucrose alone. The pH of such a mixture can be efficiently adjusted to neutrality by using Na2CO3.
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Journal of Polymer Science Part B: Polymer Physics, 1994
AbstractMiscibility of poly(4‐vinyl pyridine) (P4VP) and poly(2‐vinyl pyridine) (P2VP) with poly(viny acetate) (PVAc), poly(vinyl alcohol) PVA and poly(vinyl acetate‐co‐alcohol) (ACA copolymers) has been investigated over a wide composition range. Differentiaal scanning calorimetry (DSC) results indicate that P2VP is immiscible with PVAC, PVA, and ...
L. C. Cesteros, J. R. Isasi, Issa Katime
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AbstractMiscibility of poly(4‐vinyl pyridine) (P4VP) and poly(2‐vinyl pyridine) (P2VP) with poly(viny acetate) (PVAc), poly(vinyl alcohol) PVA and poly(vinyl acetate‐co‐alcohol) (ACA copolymers) has been investigated over a wide composition range. Differentiaal scanning calorimetry (DSC) results indicate that P2VP is immiscible with PVAC, PVA, and ...
L. C. Cesteros, J. R. Isasi, Issa Katime
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