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Showing 1 to 20 of 32 for “"linear low density polyethylene"”.
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A STUDY OF THE ROTATIONAL MOULDING OF LINEAR LOW DENSITY POLYETHYLENE
… process by studying the rotational moulding of linear low density polyethylene, and to thus contribute to the optimisation of the process. A test moulding was selected as the standard. It was established that the heating cycle of the moulding can be divided into three well defined phases; mould …
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A laboratory investigation on the shear strength characteristics of soil reinforced with recycled linear low-density polyethylene
… an investigation into the use of recycled Linear Low-Density (LLDPE) as reinforcement in Cape Flats sand. To understand the implication of the main aim of the investigation, a review of literature on soil reinforcement theory, various forms of reinforcement material and previous studies was …
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On the Melting and Crystallization of Linear Polyethylene, Poly(ethylene oxide) and Metallocene Linear Low-Density Polyethylene
… copolymer and series of narrow molecular weight linear polyethylene and poly(ethylene oxide) fractions were studied using a combination of ultra-fast and conventional differential scanning calorimetry, optical microscopy, small angle X-ray scattering, and wide angle X-ray diffraction. In the case …
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Thermorheology and processing of polyethylene blends : macromolecular structure effects
… and processing behavior 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 …
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Structure Formation and Crystallization in Two-Phase Polymer Blend Flows (Fibers, Polyethylene, Polypropylene)
Flow induced crystallization of high density polyethylene and polypropylene has been studied in a two-phase flow system using linear low density polyethylene as the carrier phase. Extensional stresses were generated under slow flow conditions by either of two methods: one involving flow past a …
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Selective ethylene dimerization by a nickel-exchanged metal-organic framework catalyst
Short linear [alpha]-olefins such as 1-butene are valuable commodity chemicals due to their use as comonomers in linear low-density polyethylene. Presently only homogeneous systems are used to catalyze ethylene dimerization in industry, causing many to suffer from quick deactivation and poor …
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Hemocompatibility of polymeric materials for blood-contacting applications
… of expanded polytetrafluoroethylene (ePTFE), linear low-density polyethylene (LLDPE) and polyethylene terephthalate (PET); 3 potential materials for blood-contacting applications. The surface morphology was characterized using scanning electron microscopy (SEM), and surface wettability was …
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Characterization and optimization of polyethylene blends
Several series of polyethylene (PE) blends were prepared where one component is a conventional PE and the second is a conventional linear low-density polyethylene (LLDPE) or a metallocene-catalyzed LLDPE. A two-step isothermal annealing (TSIA) procedure is developed enabling the satisfactorily …
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A study of flow-induced crystallization in two-phase polymer melts
The effects of shearing and elongational flows on flow induced crystallization in polymer melts were investigated for the two-phase system of high molecular weight polyethylene suspended in a linear low density polyethylene carrier phase. Shearing flow was produced by a counter-rotating couette …
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Wave Propagation and Damage Characterization in Natural Fiber Hemp and LLDPE Composite
… or carbon fiber composites such as light weight, low manufacturing cost and requiring less energy for production. NFC is also bio-degradable and recyclable. The primary objectives of this research are to explore the static and dynamic properties of the hemp and linear low density polyethylene …
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Polyolefin plastomers in composites for flooring applications
… a significant amount of post-consumer polyethylene(PC-PE) while maintaining adequate physical properties. Two types of PC-PE are tested in this research work: the first one is a linear low density polyethylene (LLDPE), and the second is a high density polyethylene (HDPE). The DSC …
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Containment of Organic Contaminants Using Geosynthetics
… coefficient (Pg) for BTEX diffusion was lowest for high density polyethylene (HDPE) geomembrane, followed by chlorosulphonated polyethylene (CSPE), linear low density polyethylene (LLDPE), two ethylene interpolymer alloy (EIA) coated polyester products, four different PE based vapour …
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Controlled Release of Natural Antioxidants from Polymer Food Packaging by Molecular Encapsulation with Cyclodextrins
… inclusion complexes of natural antioxidants into linear low density polyethylene (LLDPE), and (3) measure the release kinetics of inclusion complexes of natural antioxidants from LLDPE into a model food system. Cyclodextrin inclusion complexes of alpha-tocopherol and quercetin were formed by the …
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Investigation of the oxidative degradation mechanisms and melt stabilisation of a new generation metallocene polytehylene
… of a new generation metallocene catalysed linear low density polyethylene (m-LLDPE), in order to establish the thermal oxidative degradation mechanism, and secondly, to examine the role of selected commercial stabilisers on the melt stability of the polymers. The unstabilised m-LLDPE …
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Nanocomposites: Incorporation of Cellulose Nanocrystals into Polymers and Addition of Zwitterionic Functionality
… or polymers. Additionally, surface groups can allow the CNCs to react with environmental stimuli (smart materials). The primary focus of this work is the incorporation of CNCs in hydrophobic matrices. Herein we introduce a new method of dispersing CNCs in polyethylene (PE), a substance of …
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Characterisation and plastic-degrading potential of plastisphere-associated microorganisms
… in the environment, where its degradation is slow, impacting macrofauna. While the details of how plastics affect microorganisms are less well documented, microbes that inhabit the plastic’s surface, termed the ‘plastisphere’, are suggested to have unique functional properties, including the …
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Plasma-Enhanced Continuous Carbon Fibre-Reinforced Composites Manufactured from Recycled Thermoplastics
… polyamide 6 (PA6)/polypropylene (PP) and PA6/linear low-density polyethylene (LLDPE). A die, consisting of a slot channel with a series of crests, was developed in this thesis to impregnate CF tows with thermoplastic blends. Static and crest pressure in the die facilitated a high degree of …
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An investigation into the use of plastic chips to reduce collapsibility in loess-like soils at Mount Moorosi Village, Lesotho
… by a top layer of silty-sandy loess, a windblown soil of at least 3 m in thickness, with the majority of its grains falling within the siltsized particle range. The material demonstrated significant warping potential as well as a high hydrocollapse potential. To attempt to mitigate the …
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Biorenewable polymer thermoplastic biocomposites
… cutting costs of composite products, decrease in density, increased strength and durability, and utilizing plant fiber waste streams for cost recovery. However, these natural fibers tend to be hydrophilic in nature and do not adhere well to hydrophobic polymer matrices. Directly combining plant …
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The flow stability of linear low-density polyethlene at polymer and metal interfaces
… interface behavior in stratified bicomponent flow has been examined. First, the factors and conditions leading to the onset of surface melt fracture in linear low-density polyethylene (LLDPE) were identified using fluoro-elastomer (FE) as a blending additive and as a die coating in two …
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