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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 14 of 14 for “"Masterbatch"”.
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A Study of Heat Transfer at the Cavity-Polymer Interface in Microinjection Moulding. The effects of processing conditions, cavity surface roughness and polymer physical properties on the heat transfer coefficient
… polypropylene and polystyrene with carbon black masterbatch was performed to make materials opaque for the IR camera. The effects of addition of carbon black masterbatch were analysed using differential scanning calorimetry and Fourier transform infrared spectroscopy. Sapphire windows formed part …
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Polyethylene-montmorillonite nanocomposites
… clay sheets need to be rendered organophilic. Masterbatches with a high level (~40 %wt) of organomodified clay can then be dispersed into a host by a simple mechanical process. Two chemically different masterbatches werepurchased: Nanoblend 2101 from PolyOne Corp. and C30PE from Nanocor Inc. …
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A study of mechanochemical reactions of spin traps in hydrocarbon polymers
… and their spin adducts in the form of EPR-masterbatch on the photo and thermal-oxidation of PP have been studied. Aliphatic nitroso compounds were found to have much better photo-antioxidant activity than nitrones and aromatic nitroso compounds, and their antioxidant activity improved …
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Synthesis and Evaluation of Bound Thiol Antioxidants
… a mechanochemical process in a torque rheometer. Masterbatch concentrates containing high levels of bound antioxidants in natural and styrene-butadiene rubbers have been used as additives for untreated rubbers to obtain rubbers with high levels of oxidative stability. Oxygen absorption and stress …
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Effect of Crosslink Density on the Tearing of Gum Natural Rubber Cured with Dicumyl Peroxide (DCP)
… different amounts of curatives were added to the masterbatch) were prepared. Normal tensile and tear tests were determined. As with sulfur cured gums, the tensile strength of DCP cured gum natural rubber passes through a maximum with increased crosslink density. Breaking strain and 100% modulus …
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High Molecular Weight and Polymer-Bound Antioxidants
… and its application as a polymeric antioxidant masterbatch for virgin polypropylene was also carried out.
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Graft polymerisation of antioxidants into natural rubber
… of grafting were identified and analysed. A masterbatch technique has been developed to produce concentrates of bound antioxidants in rubber latex and these have been used as additives to untreated latex to obtain grafted rubber latices with a known level of oxidative stability. It was found …
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Preparation and properties of micro- and nanocomposites based on high density polyethylene
… in the polymer matrix and by using a commercial masterbatch of MWCNT. In all cases, the increase in creep resistance is statistically significant in the linear viscoelastic region (i.e. at low stresses or temperatures) when sufficient dispersion of the nanotubes is achieved. Interestingly enough, …
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Tensile and fracture behaviour of isotropic and die-drawn polypropylene-clay nanocomposites. Compounding, processing, characterization and mechanical properties of isotropic and die-drawn polypropylene/clay/polypropylene maleic anhydride composites
… an intensive mixing regime employing a two‑step masterbatch process successfully addressed compatibility issues and produced increases in modulus of approximately 40% and 50% for the 3% and 5% clay systems, respectively. After drawing, these improvements were reduced to around 15% and 25% …
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Characterisation of Halogen Free Fire Retardant Polypropylene Composites Reinforced by Short Natural Fibres
… hybridised favourable flame retardant (SHFFR) masterbatch has been proven to be effective for other PP natural fibre combinations. Further, the fire performnce validation has also been carried out with the help of Building Research Association of New Zealand (BRANZ).
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Desarrollo de copolímeros de propileno-etileno con resistencia a la decoloración y capacidad de espumado mediante la generación de nanocompuestos
… de oMt; y c) CPE coloreados por mezclado de un masterbatch (MB) preparado por mezclado de Cr y 20 %p/p de oMt/RA con CPE lineal. En particular, se ha analizado el efecto de la incorporación del colorante y de bajas concentraciones de arcilla en la estructura química y de fases y en las …
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Recycling of worn-out vehicular brake pads and discs
… of the recovered material with a virgin masterbatch to produce low-metallic brake pads. The study shows that this recycling approach is technically feasible, as indicated by tribological tests on the pins that were conducted to select the most promising compositions. The results reveal …
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4D-Printing with Cellulose Nanocrystal Thermoplastic Nanocomposites: Mechanical Adaptivity and Thermal Influence
… into a filament through the combination of masterbatch solvent casting and single screw extrusion. Printing temperatures of 240, 250, and 260°C and printing speeds of 600, 1100, and 1600 mm/min instituted a consistent 3D-printing process that produced characterizable CNC/TPU nanocomposite …
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Graphene and Related Materials Inks and Composites for Space Applications
Recent advancements in reusable rockets have led to a precipitous drop in pay-load to orbit costs (from $55,000/kg to $2,700/kg), enabling the establishment and meteoric rise of a commercial space industry. This opening up of space has spurred the generation of novel ideas and technologies, …