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Development and Evaluation of the Mechanical Properties of Coconut Fibre Reinforced low density polyethylene Composite

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Open Journal of Composite Materials 2022年第3期12卷 83-97页

作者： Ahmed Mohammed Bukar Abubakar Mohammed El-Jummah Abba Alhaji Hammajam Department of Mechanical Engineering University of Maiduguri Maiduguri Nigeria

This research work developed and evaluated the mechanical properties of coconut fibre reinforced low density polyethylene (LPDE) composite material. The effect of fibre loading on the mechanical properties: tensile, flexural, and impact of the developed composite material have been investigated. Also carried out was the effect of fibre loading on the water absorptivity of the developed material. Sample categories of the developed composite were prepared by varying the fibre contents by weight at 0%, 10%, 20%, and 30%. The aim is to reduce the excessive waste disposal of LDPE materials that are largely found in the form of disposed water package materials (or pure water sachets) that usually affects the environment in the form of pollution. The water retting process was applied in extracting and cleaning fibre (or coir), while the mixed coir-LDPE (or developed composite material) was prepared by Compression Moulding Technique (CMT). The tensile and flexural properties were tested using Hounsfield Monsanto Tensometer (type w) while the impact properties were tested using the Charpy Impact testing machine. The microstructure of the composite was investigated using Scanning Electron Microscopy (SEM). The fractured surface morphology of the composite samples indicated a homogeneous mixture of the coir fibre and LDPE matrix. However, weak interfacial bonding between the coir fibre and LDPE matrix was also observed. The analysis of the water absorptivity showed that the developed composite materials have low water absorptivity at low fibre loading. However, at higher fibre loading, the water absorptivity increases significantly.

关键词： Coconut Fibre low density polyethylene Composite Mechanical Properties Water Absorptivity

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A low-density polyethylene composite with phosphorus-nitrogen based flame retardant and multi-walled carbon nanotubes for enhanced electrical conductivity and acceptable flame retardancy

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Frontiers of Chemical Science and Engineering 2021年第5期15卷 1332-1345页

作者： Yong Luo Yuhui Xie Renjie Chen Ruizhi Zheng Hua Wu Xinxin Sheng Delong Xie Yi Mei Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials The Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan ProvinceFaculty of Chemical EngineeringKunming University of Science and TechnologyKunming650500China Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter School of Materials and EnergyGuangdong University of TechnologyGuangzhou510006China Institute for Chemical and Bioengineering Department of Chemistry and Applied BiosciencesETH Zurich8093ZurichSwitzerland

Design and exploitation of flame retardant polymers with high electrical conductivity are desired for polymer applications in ***,a novel phosphorus-nitrogen intumescent flame retardant was synthesized from pentaerythritol octahydrogen tetraphosphate,phenylphosphonyl dichloride,and ***-density polyethylene was combined with the flame retardant and multi-walled carbon nanotubes to form a nanocomposite material via a ball-milling and hot-pressing *** electrical conductivity,mechanical properties,thermal performance,and flame retardancy of the composites were investigated using a four-point probe instrument,universal tensile machine,thermogravimetric analysis,and cone calorimeter tests,*** was found that the addition of multi-walled carbon nanotubes can significantly improve the electrical conductivity and mechanical properties of the low-density polyethylene ***,the combination of multi-walled carbon nanotubes and phosphorus–nitrogen flame retardant remarkably enhances the flame retardancy of matrixes with an observed decrease of the peak heat release rate and total heat release of 49.8%and 51.9%,*** study provides a new and effective methodology to substantially enhance the electrical conductivity and flame retardancy of polymers with an attractive prospect for polymer applications in electrical equipment.

关键词： MWCNTs PEPA electrical conductivity flame retardant low density polyethylene

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Orientation of LDPE Crystals from Microscale to Nanoscale via Microlayer or Nanolayer Coextrusion

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Chinese Journal of Polymer Science 2016年第12期34卷 1411-1411,1412-1422页

作者： Jun-feng Cheng 浦鸿汀 School of Materials Science and Engineering Tongji University

Abstract The microlayer or nanolayer coextrusion of hundreds or thousands of alternating low density polyethylene （LDPE）/polystyrene （PS） microlayers or nanolayers were used to study the orientation of LDPE crystals in the confined quasi-two-dimensional or two-dimensional space. The clear and continuous layer structures from microscale to nanoscale can be found in SEM images. The morphology evolution of LDPE crystals in the confined microlayer or nanolayer can he varied from 3D spherulites, 2D spherulites, stacked edge-on lamellar, to single edge-on lamellar. Due to the orientation of the LDPE crystals, the tensile strength of the films increases obviously when the layer thickness reduces to nanoscale. The 2D small angle X-ray scattering （SAXS） patterns can reflect the average degree of orientation of LDPE in the confined layers. The stacking of LDPE lamellae is suppressed in interlamination and oppositely in parallel to the extrusion direction. The specific orientation function f can be calculated from the patterns. The infrared dichroism further confirms the mutation of the orientation of LDPE crystals from microscale to nanoscale in the confined space.

关键词： Microlayer or nanolayer coextrusion low density polyethylene Polystyrene Confined space Crystalorientation.

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The Impact of the Inclusion of MgO Nano-Fillers in a polyethylene Matrix on Dielectric Strength and Resistance to Partial Discharges

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Open Journal of Applied Sciences 2024年第3期14卷 626-634页

作者： Virginie Griseri Dominique Mary David Malec Eric David Laboratoire Plasma et Conversion d’énergie Université de Toulouse CNRS UPS INPT Route de Narbonne Toulouse France É cole de Technologie Supérieure de Montréal Rue Notre-Dame Ouest Montréal Canada

One commonly used strategy to enhance polymers specific properties such as the resistance to partial discharges erosion is the incorporation into the polymeric matrix of inorganic micro or nanoparticles. This study focused on the dielectric properties of low-density polyethylene (LDPE) filled with nano-sized Magnesium Oxide (MgO) particles compounded by thermo-mechanical process and one of the purposes was to establish appropriate processing parameters in order to reach the desired dielectric properties. LDPE was used as a matrix and was reinforced by MgO particles having a nominal average size of 30 nm. The MgO nanoparticles were treated with a silane coupling agent (3-Glycidyloxypropyl Trimethoxysilane). The samples were initially prepared in a melt-mixing chamber with a MgO content of 1% wt. These pre-mixed samples were further treated by the means of thermo-mechanical mixing in a conical co-rotating twin-screw extruder in order to improve the dispersion and distribution of the MgO particles. In this report, both lifetime under a PD activity and AC dielectric strength of pure and nano-filled LDPE samples have been measured and compared. Nano-filled LDPE samples were found to exhibit an improve lifetime, without any detrimental impact on their short-term dielectric strength. This suggests that nano-filled LDPE may be for electric applications for which the dielectric materials may be exposed to partial discharge activities. This is significant result for the use of MgO-reinforced PE as an insulating material for HV cables since the resistance to PD is closely related to treeing resistance which is the main electrical degradation mechanism that leads to failure for shielded extruded power cables.

关键词： low density polyethylene MgO Nanofillers Dielectric Strength Partial Discharges Resistance

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Conception by a Process for Extruding Plastic Mulching Film with Cade Oil and Study of Snail Repellent and Anti-bacterial Adhesion Effects

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Journal of Agricultural Science and Technology(B) 2020年第5期10卷 265-273页

作者： Fatima Azzahra Louanjli Bouchaib Bahlaouan Asmaa Fathi Fatima Zahra Ozi Meryem Hadidi Souha Assaba Said El Antri Nadia Boutaleb Laboratory of Biochemistry Environment and Agri-Food(URAC36)University Hassan IICasablanca 20650Morocco Higher Institutes of the Nursing Professions and Techniques of Health(ISPITS) Casablanca 20250Morocco

In organic lettuce cultivation,snails can cause great economic *** is a lack of effective control methods for these *** work is focused on the development of a new agricultural plastic mulch material based on low density polyethylene(LDPE),as it is the most widely used polymer in *** objective was to develop a new bio-based plastic mulch material that is insect repellent and anti-biofilm by incorporating a bioactive substance into the conventional formulation of the material.A new plastic mulching film made of 0.1%cade oil as was produced using the extrusion *** tests carried out with aqueous suspensions of Escherichia coli and Pseudomonas aeruginosa show that this material is endowed with anti-biofilm *** study will demonstrate how to act by repulsive effect to Helix aspersa against this devastating mollusk in salads culture.

关键词： Plasticulture antifouling low density polyethylene bioactive substance repellent snail ecology

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