Global ETD Search
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 20 of 71 for “"LDPE"”.
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Development of LDPE-based antimicrobial films for food packaging
… the manufacturing of low-density polyethylene (LDPE) film is explored by measuring the release of AM agent into food simulants. The release of AM agents from the film is satisfactorily and consistently described by short-term and long-term migration equations and by first order kinetics. …
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Rheological characterization of LDPE and PMMA with optical methods
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1988.
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Thermorheology and processing of polyethylene blends : macromolecular structure effects
… of a number of linear low-density polyethylene(LLDPE)/low-density polyethylene (LDPE) blends was studied with emphasis on the effects of long chain branching. First, a linear low-density polyethylene (LL3001.32) was blended with four LDPE's having distinctly different molecular weights. At high …
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Stability of aseptically packaged food as a function of oxidation initiated by a polymer contact surface
In this study, low density polyethylene (LDPE) and polyethylene terephalate (PETE) resin beads were ground to a coarse powder and exposed to sterilization treatments applied to the food contact surface of packaging materials used in aseptically processed and packaged food. Electron paranlagnetic …
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The effects of crosslinking byproducts on the electrical properties of low density polyethylene
… Despite high concentration of byproducts in the LDPE film compared to practical, the measurement results have successfully reveal the contribution of each byproduct on the electrical properties. It should be noted that some consideration should be taken when taking the quantitative value from the …
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Processing, structure and thermo-mechanical properties of reclaimed nanoclay, and its application in polyamide 6 and low-density polyethylene nanocomposites.
… rheological and thermo-mechanical behaviour of LDPE and PA6 nanocomposite materials. The thesis begins with a critical literature review, covering oil-based mud (OBM) waste treatments, polymer nanocomposites and their manufacturing, thermal degradation behaviour and mechanical performance. This …
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Qualidade e conservação pós-colheita de frutos da jabuticabeira (Myrciaria cauliflora) sob atmosfera modificada ativa
… of the use of low density polyethylene packages (LDPE) in cold storage on postharvest conservation of jabuticabas for fresh consumption. The experiment was carried on a completely randomized design, in a factorial scheme (2x2), with two LDPE thicknesses and vacuum conditions (with and without), …
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An investigation into the relationship between processing, orientation and properties of low density polyethylene films
… conditions on the mechanical properties of LDPE, LLDPE and blends of LDPE and LLDPE blown films was studied.The results were analysed by relating the change in mechanical properties with the change in the residual strain of manufactured film. The residual strain was measured by using a …
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Biosynthesis and characterisation of polyhydroxyalkanoate biopolymers and their oligomers for circular economy
… study were oxidised low-density polyethylene (LDPE), LDPE separated from Tetra Pak® waste (PE-T) and [text redacted]. These plastic wastes were supplied directly to Cupriavidus necator for use as potential carbon sources for PHA accumulation in a 48-hour shake flask cultivation study, in either …
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Development of high-performance recyclable films for food packaging
… uma matriz de polietileno de baixa densidade (LDPE) e o outro com matriz de etileno vinil álcool (EVOH), onde foram produzidos diferentes micro e nanocompósitos e correspondentes filmes, procedendo à composição por extrusão e à extrusão de filme tubular, respetivamente. O desempenho destes …
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Investigation of Recyclable and Renewable Crude oil from Biomass and Plastics
… the feedstock ranged from virgin plastic resins (LDPE, HDPE, PS, PP), recycled rubber from tires to poplar wood chips. It was found that, increasing the temperature from 500 ∘C to 600 ∘C for LDPE and HDPE decrease the liquid oil yield from 61.1% to 54.7% and 79.0 wt.% to 75.5 wt.% respectively. …
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Blade dynamics and flux measurements for model seagrass blades in waves and currents
… constructed from low-density polyethylene (LDPE) film were used as a laboratory proxy. In accordance with previous studies of LDPE, the balance of the drag force due to fluid motion and the restoring force due to blade stiffness determined the blade posture in unidirectional flow and the …
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Flow of viscoelastic fluids through banks of cylinders: an experimental and numerical investigation
… were fit to the steady shear viscosity of a LLDPE melt and a LDPE melt. The PTT and RS models were also fit to uniaxial extensional stress growth data for each melt. The predictions of the pressure drop by means of the finite element calculations and a capillary model based on Darcys Law were …
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Studies of the Evaluation of Solid Phase Dispersants in Polymer Blends
… polymers. Low-density polyethylene (LDPE) and polystyrene (PS) were chosen for this study because of the mechanical properties of these blends. To improve performance, block and graft copolymers of ethylene-styrene as solid phase dispersants (SPDs) were added to blends containing …
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The Accelerated Photo-Degradation of Low Density Polyethylene
… photo-activators to low density polyethylene (LDPE). They included benzophenone, substituted benzophenones, metal-di-thiocarbamates, transitional metal-complexes containing ligands, acetyl-acetone substituted salicylaldoximes, disalicylaldehyde-ethylene-diamine mercaptobenzimidazole(MBI) and …
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Bench-scale fire toxicity measurements of polymers and cables
… in a fire. A study of carbon monoxide yields for LDPE, PVC and a 50:50 LDPE/PVC mixture was undertaken as a function of equivalence ratio and the furnace temperature. For the LDPE/PVC mixture, a high CO yield was obtained, higher than for pure LDPE (about 1.5 times higher) and similar to pure PVC. …
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The planar entry flow behavior of polymer melts: an experimental and numerical analysis
The planar entry flow behavior of polystyrene, LDPE, and HDPE has been observed experimentally. The purpose of the work was to determine the cause of vortex growth and explain why this phenomenon occurs in some polymers but not in others. To accomplish this a die was constructed in which nearly any …
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Ruminal Degradation of Polyhydroxyalkanoate and Poly(butylene succinate-co-adipate)
… PBSA:PHA blend, and low-density polyethylene (LDPE) films were incubated in the rumens of three cannulated, non-lactating Holsteins for 0, 1, 14, 30, 60, 90, 120, and 150d. In situ disappearance (ISD) and residue length were assessed after every incubation time. Polyhydroxyalkanoate achieved …
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Co-gasification of biomass and plastic waste in a bubbling fluidized bed reactor
… where each BSD and RH was mixed with both LDPE and HDPE in the presence of three different bed materials, namely silica sand, olivine, and red mud. It was found that mixing the biomass with LDPE and HDPE increased hydrogen gas (H2) production. The Hydrogen gas concentration in the product …
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