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Showing 1 to 20 of 377 for “"polypropylene"”.
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Understanding the effect of nanofillers on the properties of polypropylene and glass fiber/polypropylene multiscale composites
In this study, polypropylene (PP) based nanocomposites were prepared by incorporating different kinds and amounts of silica nanoparticles and graphite nanoplatelets (GNP). The role of various percentages of compatibilizer polypropylene grafted with maleic anhydride (PPgMA) into PP nanocomposites …
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Physico-chemical properties of polypropylene glycols
Poly(propylene glycol) (PPG) samples of different molecular mass were characterized using differential scanning calorimetry, modulated differential scanning calorimetry, thermogravimetry and thermally stimulated current (TSC) spectroscopy. It was shown, by TSC, that the glass transition temperature …
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Thermal and photolytic degradation of polypropylene
Summary available p.[ix]
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The production of polypropylene microcellular foam
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1985.
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Phase separation spinning of polypropylene fibers
Polypropylene fibers were spun from solutions of different polymer contents undergoing phase separation. The range of concentrations used was 25 to 60 wt. % polypropylene. The solvent used was naphthalene. After the naphthalene was extracted from the fibers using diethyl ether the fiber's …
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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
… study, the physical and mechanical properties of polypropylene nanocomposites (PPNCs) supplied by Queen’s University Belfast were evaluated. Subsequently, polymer/clay nanocomposite materials were produced at Bradford, where mixing and processing routes were explored and the mechanical properties …
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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
… study, physical and mechanical properties of polypropylene nanocomposites (PPNCs) for samples received from Queen's University Belfast have been evaluated. Subsequently, polymer/clay nanocomposite material has been produced at Bradford. Mixing and processing routes have been explored, and …
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Mineral-filled polypropylene: Improvement of scratch resistance
… (PC+ABS), pigmented mineral-filled polypropylene (PP) finds an opening in automotive interior components such as instrument panels, knee bolsters, consoles, etc. Because of the lack of surface aesthetics, pigmented mineral-filled PP is experiencing a limitation to its acceptance in …
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Investigation of mechanical properties of recycled polypropylene
… This research concerns the number of times polypropylene (PP) formed by the injection mouldlng process can be recycled. The work focuses on the quality of the materlal dter each recycling operation Material was passed through the forming process up to three times Also, since it is posslble …
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The effects of ionising radiation on polypropylene
… and the literature relating; to the effects on polypropylene is reviewed. Oxidative and free radical reactions are discussed with particular reference to post-irradiationeffects.Isotactic and atactic polypropylene were δ and electron irradiated to doses of up to 20 megarad. Irradiations …
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Polypropylene fiber reinforced concrete in railway crossties
… under tensile stresses. Inclusion of synthetic polypropylene macro fibers in concrete is known to improve crack resistance and is a feasible solution for prolonging the life of crossties. The present study investigated the performance of synthetic polypropylene macro fiber reinforced concrete …
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Performance of Hemp-Fibre Reinforced Polypropylene Composite Materials
… to produce an improved hemp fibre reinforced polypropylene composite material. Hemp fibre was alkali treated at elevated temperatures in a small pressure vessel with either a solution of 10wt% NaOH or 5wt% NaOH / 2wt% Na2SO3. Single fibre tensile tests were performed on treated and untreated …
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Novel polypropylene based microporous membranes via spherulitic deformation
A novel method for creating a microporous polypropylene membrane via spherulitic deformation is described. The microporous structure was generated by the combination of intra-spherulitic and inter-spherulitic deformations. Polypropylene was selected due to its unique cross-hatched lamellar …
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Structure-property characterisation of ternary phase polypropylene composites
… and properties of binary- and ternary-phase polypropylene (PP) composites containing ethylene-propylene rubber (EPR) and glass beads has been carried out. The composite structure was evaluated using various techniques including SEM, DSC, XRD and DMA. While the mechanical tests included …
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Manufacturing and Evaluation of Kenaf/Polypropylene Honeycomb Cores
… cores manufactured from very thin extruded kenaf/polypropylene sheets is presented here. The manufacturing process involves production of flat composite sheets using an extruder, thermoforming the flat sheets into half-hexagonal corrugations and joining of the corrugations using an ultrasonic …
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The abrasive wear behaviour of mineral-filled polypropylene
Polypropylene is an extremely versatile polymer because its properties can be modified to meet specific requirements. The use of polypropylene in domestic and automobile applications has initiated research focused on the tribological behaviour of the material. In the present study, polypropylene …
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Toughening mechanisms in polypropylene filled with rigid particles
… of deformation and fracture of isotactic polypropylene filled with CaCO3 particles were studied. In slow tension, addition of fillers increased the modulus and decreased the yield stress independent of filler type. An optimum size of particles was found to improve Izod impact energy up to …
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Phase separation spinning of porous polypropylene hollow fibers
… separation polymer-solvent systems were studied: polypropylene-paraffin wax, and polypropylene-naphthalene. A tube-in-orifice spinneret design was used. All attempts to spin hollow fibers using the polypropyleneparaffin wax system failed. Initial attempts to produce hollow fibers from …
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