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Open Journal of Composite Materials 2018年第1期8卷 28-42页

作者： Bjorn Marteinsson Edgar Gudmundsson Faculty of Civil and Environmental Engineering University of IcelandReykjavikIceland Innovation Center Iceland ReykjavikIceland Speca ReykjavikIceland

The effect of CO2 injection on initial strength increase and hardening of cement-fibre mix in a cement bonded particle board (CBPB) production was evaluated. Different cement contents, formation pressure and types of fibres were considered. The initial strength increase with CO2 injection is so much faster than this caused by conventional hydration that the produced samples do not need additional curing before they can be stored. Similar strength and stiffness values as in conventional products on the market are gained with lower cement content for similar types of fibres. Visual inspection of board surfaces aged for 13 years in a harsh exterior environment as well as comparison of strength and stiffness values for these boards when new and after ageing, gives a very satisfying result. The combined effect of the above discussed gains results in markedly increased productivity at lower cost and lower environmental impacts than is possible in traditional CBPB production.

关键词： Fibre Cements Carbon Dioxide Initial Hardening natural fibres Strength Durability

Electrical conductivity of the graphene nanoplatelets coated natural and synthetic fibres using electrophoretic deposition technique

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International Journal of Smart and Nano Materials 2018年第3期9卷 167-183,I0002页

作者： Hamid Souri Debes Bhattacharyya Centre for Advanced Composite Materials Department of Mechanical EngineeringThe University of AucklandAucklandNew Zealand

Herein,electrically conductive natural and synthetic yarns through electrophoretic deposition(EPD)technique were fabricated.A parametric study on the conductivity enhancement of the yarns is carried out by Taguchi *** this method,the desirable conditions are determined by studying the effects of important parameters on the electrical conductivity of the yarns in the EPD coating *** on the L18 design of experiments table,the preferred combination of factors to obtain the highest electrical conductivity of the yarns is found by Taguchi *** addition,the Pareto ANOVA analysis is conducted to identify the major contributing factors on the electrical conductivity of the *** techniques,such as scanning electron microscopy(SEM),Fourier transformed infrared spectroscopy(FTIR)in attenuated total reflectance(ATR)mode,and thermogravimetric analysis(TGA)are utilised for better understanding the microstructure and physical *** powered by only 3 V,the maximum temperature of a Joule heated conductive sample based on natural fibre yarns reached 102°C in less than 25 s.

关键词： Graphene nanoplatelets electrical conductivity natural fibres electrothermal behaviour Taguchi method

Application of dynamic image analysis to the optical characterisation of fibrous bulk material

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Particuology 2024年第7期90卷 51-60页

作者： Johannes Lunewski Eberhard Schmidt Institute of Particle Technology University of WuppertalGermany

Dynamic image analysis provides an automated evaluation method to determine the size and shape of multiple particles. This method represents a common application for ordinary bulk material. The latest draft of ISO 13322–2:2021 describes the state of the art, but lacks instructions for handling fibrous bulk material. Interlocking fibres complicate the measurement conditions and require a disentanglement of fibrous samples during a pre-dispersion step. A further error source includes the fibre orientation inside the measurement zone of the device. If the thresholding algorithm fails to differentiate between the fibre projection area and the background, a subsequent image optimisation solves the problem. This article addresses the mentioned problems by analysing cotton cellulose and polyacrylonitrile fibres. Besides the execution of a pre-dispersion step, the experiments compare the discrepancies between dry and wet dispersion. Here, the software packages PAQXOS and ImageJ perform the image evaluation. In this case, the wet dispersion setup with a subsequent image evaluation by ImageJ provides comprehensible results.

关键词： Bootstrap method Dynamic image analysis Fibre diameter Fibre length distribution natural fibres Synthetic fibres

Thermally insulating robust carbon composite foams with high EMI shielding from natural cotton

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Journal of Materials Science & Technology 2021年第35期94卷 113-122页

作者： A.Chithra Praveen Wilson Sujith Vijayan R.Rajeev K.Prabhakaran Department of Chemistry Indian Institute of Space Science and TechnologyThiruvananthapuram 695547India Analytical and Spectroscopy Division Vikram Sarabhai Space CentreThiruvananthapuram 695022India

Thermally insulating and fire-resistant carbon composite foams are prepared by consolidating natural cotton fibre dispersed in aqueous sucrose solution by filter-pressing followed by drying and *** compressive strength(5 kPa to 1.4 MPa)and thermal conductivity(0.069 to 0.185 W m^(-1)K^(-1))depend on the foam density(0.06 to 0.31 g cm^(-3))which is modulated by varying the sucrose solutions concentration(100 to 700 g L^(-1)).Partially flexible to the rigid transition of the carbon composite foams occurs at sucrose concentration above 200 g L^(-1).The tubular carbon fibre formed from cotton is welded at their contact points by the amorphous carbon produced from sucrose leading to partial flexibility at low sucrose concentration and advancement of fibre-to-fibre bonding area at higher sucrose concentration results in rigid *** porosity in the inter-fibre space and lumen of the carbonized cotton fibre contributes to the low thermal *** carbon composite foams prepared at a sucrose solution concentration of 500 g L^(-1) and above are amenable to machining using conventional machines and *** rigid carbon foams show EMI shielding effectiveness and specific shielding effectiveness in the ranges of 21.5 to 38.9 d B and 108-138 dB cm^(3) g^(-1),respectively.

关键词： Foams natural fibres thermal properties consolidation mechanical properties emi shielding properties

Properties of natural Rubber Biocomposities Filled with Alkaline Modified Oat Straw

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Journal of Renewable Materials 2018年第7期6卷 746-754页

作者： Marcin Masłowski Justyna Miedzianowska Krzysztof Strzelec Institute of Polymer&Dye Technology Lodz University of TechnologyStefanowskiego 12/1690-924 LodzPoland

Novel elastomer biocomposites based on straw fibers (raw or chemically modified) as reinforcing elements ofnatural rubber (NR) were reported and studied. Oat straw fibres with different average lengths were *** materials were incorporated into the elastomer, before and after chemical surface modificationinvolving sodium hydroxide. Fourier transform infrared spectroscopy (FTIR) and microscopy techniques wereemployed for characterization of fillers. The kinetics of rubber mixtures, as well as rheometric properties ofcompounds were determined. The cross-linking density was executed on the basis of equilibrium solventswellingmeasurements applying the modified Flory–Rehner equation. The morphology of biocompositessamples was analyzed by a scanning electron microscopy. Mechanical characteristic: the values of hardness,tensile strength and attenuation coefficient were also determined. The physical and chemical investigations haveproved the reinforcing effect of treated oat straw on natural rubber vulcanizates.

关键词： Alkalization biocomposites natural fibres natural rubber straw

Mechanical and Thermal Properties of Recycled Mixed Waste Polymers Reinforced with Reclaimed Newsprint fibres

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Journal of Environmental Science and Engineering(A) 2019年第3期8卷 83-89页

作者： Peter Fajs Vesna Zepic Bogataj Marko Omahen Ari Hentonnenand Carolina Penalva TECOS Slovenian Tool and Die Development CentreCelje 3000Slovenia OMAPLAST Grosuplje 1230Slovenia ECOPULP Finland Oy Koria 45610Finland AITIIP Centro Tecnológico Polígono EmpresariumZaragoza 50720Spain

This study investigates the mechanical,thermal and morphological properties of rHDPE(Recycled High Density Polyethylene)and a mixture of rPE HD/LD(High and Low Density Polyethylene),both reinforced with rNP(Reclaimed Newsprint Paper)*** enhance the composite properties,the addition of highly grafted maleic anhydride polyethylene wax,as CA(Coupling Agent),and semi crystalline copolymer of propylene and ethylene,as IM(Impact Modifier),was included into the material formulation by a twin-screw *** and morphological properties were studied on tensile test specimens,prepared by injection moulding,by tensile testing machine and SEM(Scanning Electron Microscope),*** properties,*** and crystallization behaviour,were investigated by DSC(Differential Scanning Calorimetry).Mechanical analysis showed that the addition of rNP in both composites increased the young modulus and significantly decreased the elongation at *** DSC results revealed that the addition of the rNP in the rHDPE matrix led to a substantial decrease of crystallinity,which consequently affects the tensile strength of the composite(17 MPa)in contrast to the neat rHDPE(25 MPa).On the contrary,fibre addition in rPE HD/LD matrix had no specific impact on the crystallinity index,but did contribute to the increased tensile strength(26 MPa)when compared with neat rPE HD/LD(16 MPa).SEM photomicrographs of the impact fracture surfaces demonstrated a solid adhesion bond between the natural fibres and the rPE HD/LD *** newsprint fibres can thus be considered as a perspective alternative to the inorganic fillers in the rPE HD/LD composite.

关键词： Recycled high and low density polyethylene natural fibres mechanical properties DSC recycling