Results 261 to 270 of about 88,383 (304)

Characterization of poly(vinyl alcohol)

Journal of Applied Polymer Science, 1985
AbstractMolecular 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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Porous poly(vinyl alcohol) film

Journal of Colloid and Interface Science, 1980
Abstract The porous poly(vinyl alcohol) film was prepared with an acetone extraction of the poly(vinyl acetate) particles from the poly(vinyl acetate) latex film which was polymerized in the presence of poly(vinyl alcohol). The extraction percent of poly(vinyl acetate) from the poly(vinyl acetate) latex film was over 96%, independent of the film ...
Sadao Hayashi, Masahiro Takagi, Nobumasa Hojo   +2 more
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Biodegradability of poly(vinyl alcohol)

Polymer Engineering & Science, 1999
AbstractPlastic 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, G. Ligia Sierra, G. Amanda Inés Mejía   +2 more
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Preparation of poly(vinyl acetate)/clay and poly(vinyl acetate)/poly(vinyl alcohol)/clay microspheres

Fibers and Polymers, 2006
Poly(vinyl acetate) (PVAc)/poly(vinyl alcohol)(PVA)/montmorillonite (MMT) clay nanocomposite microspheres with a core/shell structure have been developed via a suspension polymerization approach. In order to prepare the PVAc/MMT and PVAc/PVA/MMT nanocomposite microspheres, which are promising precursor of PVA/MMT nanocomposite microspheres, suspension ...
Hye Min Jung, Eun Mi Lee, Byung Chul Ji, Sung Ok Sohn, Han Do Ghim, Hyunju Cho, Young A Han, Jin Hyun Choi, Jae Deuk Yun, Jeong Hyun Yeum   +9 more
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Highly lubricious poly(vinyl alcohol)–poly(acrylic acid) hydrogels

Journal of Biomedical Materials Research Part B: Applied Biomaterials, 2011
AbstractPoly(vinyl alcohol) (PVA) hydrogels have desirable characteristics for use as artificial cartilage, such as biocompatibility, high water content, and surface lubricity. However, PVA hydrogels are not strong enough to withstand the demanding load‐bearing environment in human joints. Thermal annealing can greatly improve compressive strength, but
Jeeyoung, Choi, Hsiang J, Kung, Celia E, Macias, Orhun K, Muratoglu   +3 more
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Poly(Vinyl Alcohol) for Adhesives

1990
Poly(vinyl alcohol) (PVOH) is a water-soluble synthetic resin. It is produced by the hydrolysis of poly(vinyl acetate); the theoretical monomer, CH2=CHOH, does not exist. Discovery of PVOH was credited to German scientists W.O. Herrmann and W.
Harold L. Jaffe, Franklin M. Rosenblum
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On the viscoelastic properties of poly(vinyl alcohol) and chemically crosslinked poly(vinyl alcohol)

Journal of Applied Polymer Science, 2001
AbstractPoly(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, Jang‐Woo Park, Eli Ruckenstein   +2 more
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Poly(vinyl alcohol) membranes for adhesion prevention

Journal of Biomedical Materials Research Part B: Applied Biomaterials, 2004
AbstractThe abnormal joining of anatomic structures after abdominal and pelvic surgery can lead to such major complications as bowel obstruction or infertility. Poly(vinyl alcohol) (PVA) membranes and hydrogels were placed over the injured tissue to act as a physical barrier and prevent such adhesions from occurring in a rabbit sidewall model.
Christine, Weis, Erich K, Odermatt, Jörg, Kressler, Zofia, Funke, Tim, Wehner, Dorothee, Freytag   +5 more
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Poly(Vinyl Alcohol) Cellulose Nanocomposites

2014
Cellulose is the most abundant natural biopolymer in the world. Cellulose fibrils in micro- and nanoscales are attractive materials to replace man-made fibers such as glass and aramid fibers. They can be used as the reinforced additives or fillers to produce environmentally friendly materials. Poly(vinyl alcohol) (PVA) is a biodegradable polymer, which
Qingzheng Cheng, Siqun Wang, Zhaohui Tong   +2 more
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Poly(Vinyl Alcohol)‐Based Polyelectrolyte Pervaporation Membranes

Annals of the New York Academy of Sciences, 2003
Abstract: By modifying poly(vinyl alcohol) (PVA), phosphatic anionic PVA (P‐PVA) and quaternary ammonium cationic PVA (C‐PVA) with various degrees of substitution (D.S.) were synthesized. The effects of synthesis conditions on the degree of substitution were studied.
Benhui, Sun, Jian, Zou
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