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Showing 1 to 15 of 15 for “"Polyvinyl Acetate"”.
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Revisiting a Past Treatment of the Painted Interior of San José de Tumacácori
… the 1949 treatment of the painted plaster using polyvinyl acetate (PVAC), in the interior at the Mission Church of San José de Tumacácori. The treatment was proposed by Rutherford Gettens of the Fogg Museum and executed by Charlie Steen of the National Park Service. The PVAC was sprayed over the …
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Effects of API particle size on the dissolution rate in molten polymer excipient matrices during hot melt extrusion, conducted in a co-rotating twin-screw extruder
… Acetaminophen (APAP) and amphiphilic polyvinyl caprolactam-polyvinyl acetate-polyethylene glycol graft copolymer (PVCap-PVAc-PEG) (Soluplus) are chosen as the model API and water- soluble polymer excipient, respectively. APAP is milled using a fluid energy mill (FEM) into two different …
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The Influence of PVAP on the Stability of Amorphous Solid Dispersions of Itraconazole Produced using Hot Melt Extrusion Technology
… to improve the melt extrusion processability of polyvinyl acetate phthalate (PVAP) and investigate its use as a stabilizing polymer for supersaturated solutions of itraconazole (ITZ) in neutral pH aqueous media and in the solid-state during storage over time. Polyvinyl pyrrolidone vinyl acetate …
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An Improved Method for the Fracture Cleavage Testing of Adhesively-Bonded Wood
… the effect of loading rates on a cross-linked polyvinyl acetate adhesive and maximum SERR values of 370 - 560 J/m2 were achieved. Adhesive penetration and cure were determined by image analysis with fluorescence microscopy, and by micro-dielectric analysis, respectively. Since the geometry of …
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DRUG RELEASE FROM LIQUID FILLED CAPSULE FORMULATIONS
The effects of polyvinyl acetate (PVA) concentration, drug load, molecular weight of polyethylene glycol (PEG) and pH of the dissolution medium on the in vitro release of theophylline and ibuprofen from mixtures of PEG with 0 - 10 % w/w PVA, liquid-filled into hard gelatin capsules, have been …
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A study of the relation between molecular weight distribution and mechanical properties of polyvinyl alcohol
… properties and molecular weight distribution of polyvinyl alcohol was carried out. The polyvinyl alcohol was fractionated with respect to degree of polymerization (D.P.) by precipitation of the fractions from 2% solution in water with a n-propyl alcohol-water nonsolvent. The initial small scale …
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Experimental and Numerical Investigation of the Mechanical Properties of Novel Bamboo-Timber and Bamboo Composites for Sustainable Construction
… press techniques and bonded with bio-epoxy and polyvinyl acetate adhesives. The hybrid configuration with alternating bamboo and timber layers was fabricated to improve stress transfer, interfacial bonding, and dimensional stability while maintaining the environmental advantages of bio-based …
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Novel Application of Twin Screw Extruder on Production of Diverse Formulations
… dry granulation techniques. Kollidon® SR is a polyvinyl acetate (PVAc) and polyvinyl pyrrolidone (PVP) based polymer. The plastic PVAc and sticky PVP make Kollidon® SR an extraordinary option for direct compression of high hardness and low friability tablet. In addition, the low glass …
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Comparative Analysis of Inactivated Wood Surfaces
… was not evident for specimens bonded with polyvinyl-acetate (PVA) adhesive. NaOH surface treatment was most effective for improving adhesion of the PF adhesive bond.
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Optimization of sample preparation in Matrix-Assisted Laser Desorption/Ionization (MALDI) Mass Spectrometry of macromolecules
… (MALDI-FTMS) analysis of low molecular weight polyvinyl acetate (PVAc) was developed and then applied to the characterization of commercially available chewing gum. The optimization of MALDI analysis of PVAc was achieved by investigating the influence of sample preparation variables such as the …
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Gas Jet Process for Production of Sub-micron Fibers
… was studied for pair of immiscible polymers. Polyvinyl acetate (PVAc), polyethylene oxide (PEO), and polyvinyl pyrrolidone (PVP) were used to create compound fibers with different sizes and configurations. Second, the production of bi-component nanofibers with controlled morphology produced …
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An experimental study of high-performance concrete using metakaolin additive and polymer admixture
… of the Styrene-Butadiene rubber (SBR) and Polyvinyl acetate (PVA), to conduct a novel research to investigate the effectiveness of the additives materials on the performance of concrete. It also investigates the effect of additional recycled plastic and glass fibre as reinforcements used in …
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Development of water-soluble PEG-based binder systems for Ti Metal Injection Moulding
… further improved by the adding a small amount of polyvinyl acetate (PVAc). The small amount of PVAc effectively improved the rheological properties and homogeneity of Ti feedstock and the green strength of the injection moulded samples. The resulting sintered samples made from this improved binder …