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Showing 1 to 19 of 19 for “"PVAc"”.
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Development of a biodegradable biopolymer from renewable natural resources suitable for additive manufacturing and bone tissue engineering
… acid and 1% poly(vinyl acetate) was selected (PVAc composite 2% CS, PVAc composite 3% CS and PVAc composite 4% CS). Surface morphology showed that PVAc composite 2% CS was non-porous, while the 3% and 4% chitosan counterparts were porous. All three PVAc composite films were biodegradable and …
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Revisiting a Past Treatment of the Painted Interior of San José de Tumacácori
… 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 entire interior in …
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Development of water-soluble PEG-based binder systems for Ti Metal Injection Moulding
… 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 system showed …
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Effect of structure and plasticizer on the glass transition of adsorbed polymer
… of adsorbed PMMA, poly(vinyl acetate) (PVAc), and poly(methyl acrylate) (PMA) on silica was made using the same technique. The amounts of tightly-bound PMMA (0.78 mg/m²), PVAc (0.78 mg/m²), and PMA (0.72 mg/m²), adsorbed on silica surfaces did not differ much. The ratios of heat capacity …
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Hip-shoulder separation in the javelin throw and its relationship with level of experience
… correlation was found between PVASIS and PVAC (r = 0.714, p = 0.047) along with age and PVAC (rs = 0.762, p = 0.028). As athletes increase in age, utilization of the right hip increases, generating a greater peak hip velocity. Energy from the drive hip transfers up through the trunk and …
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Polyethylene-based Polar Block Copolymers Preparation using Organometallic-Mediated Radical Polymerization
… 4, 5, and 6 reported the synthesis of PMA-b-PE, PVAc-b-PE, and PDMA-b-PE copolymers using PMA-Co(salen), PVAc-Co(salen), and PDMA-Co(salen) complexes, respectively. It was found that the degree of polymerization of ethylene increased with higher ethylene pressure, longer reaction duration, and …
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Optimization of sample preparation in Matrix-Assisted Laser Desorption/Ionization (MALDI) Mass Spectrometry of macromolecules
… 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 choice of solvent …
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Measurement and Modelling of Soft Solid Layers in Cleaning Applications
… the swelling of gelatin, poly(vinyl acetate) (PVAc) and complex model soil layers at different pH and temperatures. All these materials underwent rapid initial hydration, followed by different longer term behaviour: gelatin and PVAc layers at pH < 11 exhibited Fickian diffusion control while at …
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Novel Application of Twin Screw Extruder on Production of Diverse Formulations
… 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 transition temperature (Tg) …
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Applications of high resolution solid state carbon-13 NMR to the study of multicomponent polymer systems
… methacrylate) {PMMA}, poly(vinyl acetate} (PVAc) and poly(vinyl methyl ether) (PVME). For the thermoplastic copolymers, higher degree of phase separation between the hard and soft domains was indicated by two facts: First, ¹³C resonances of either domain could be selectively observed with …
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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
… 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 particle sizes. The thermal properties of processed samples are characterized by …
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Foaming of amorphous drug delivery systems prepared by hot melt mixing and extrusion
… systems: Indomethacin (INM) with Soluplus (PVCap-PVAc-PEG); Carbamazepine (CBZ) with PVCap-PVAc-PEG; and INM with Eudragit EPO. Comprehensive characterization of these binary systems carried out by combining Differential Scanning Calorimetry, Fourier Transform Infrared spectroscopy, X-Ray …
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Mikromechanische Untersuchungen an Epoxidharz-Glasfaser-Verbundwerkstoffen unter zyklischer Wechselbelastung
… in die Epoxidmatrix stattfindet. Bei den PVAc-Proben verleiht der PVAc-Filmbildner der Grenzschicht ebenfalls, trotz geringer Haftung zwischen Faser und Matrix, eine gewisse Plastizität und Fähigkeit, Energie zu dissipieren. Diese Eigenschaft der Schlichte kann auch bei den …
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New Photocatalytic Nanocomposites Layered on Building Substrates for the Abatement of Xenobiotic [PollutantsNuovi Nanocompositi Fotocatalitici Depositati su Cemento per l’Abbattimento di Inquinanti Xenobiotici]
… polimeri comunemente usati – polivinilacetato (PVAc), polimetilmetacrilato (PMMA) e polistirene (PS) – sono stati scelti come matrici per i nanocatalizzatori. I nanocompositi a base polimerica sono stati sintetizzati mediante polimerizzazione radicalica in massa e in situ, garantendo la crescita …
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Bistability and Electrical Characterisation of Two Terminal Non-Volatile Polymer Memory Devices.
… which included, blend and layered with a PVAc polymer, and as a bulk material with a single crystal structure using MIM memory devices and MIS device structures. The results showed that nickel oxide was the most effective material as a blend with the polymer for memory performance, this …
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Surface Characterization of Siloxane, Silsesquioxane, and Maleic Anhydride Containing Polymers at Air/Liquid Interfaces
… (PDMS) and poly(vinylacetate) (PVAc) was explored using surface pressure-area per monomer isotherms (P-A) and BAM. Substantial morphological differences are seen between polymer blends with heptasubstituted trisilanol-POSS and fully condensed octasubstituted-POSS due to …
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Understanding the Role of N-Methylolacrylamide (Nma) Distribution in Poly(Vinyl Acetate) Latex Adhesives
… (NMA) units in crosslinking poly(vinyl acetate) (PVAc) adhesives. In this case, distribution refers to the three potential locations of polymerized NMA units in a latex: the water-phase, the surface of polymer particles, and the core of the polymer particles. The objective is to identify the …
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Gas Jet Process for Production of Sub-micron Fibers
… 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 from homogeneous …
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Thermally/Mechanically Responsive Polymeric Composites with Shape Memory/Self-Healing Properties
… <p>Chapter 5. Specifically Poly(vinyl acetate) (PVAc) and poly(ε-caprolactone) (PCL) solutions were dual-electrospun to fabricate composites featuring shape memory assisted self-healing (SMASH) and SM properties. The resulting material was capable of restoring its shape and mechanical properties …