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Literatura académica sobre el tema "Lignocellulosic composite"

Autor: Grafiati

Publicado: 1 de junio de 2024

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Artículos de revistas sobre el tema "Lignocellulosic composite"

El-Meligy, Magda G., Waleed K. El-Zawawy y Maha M. Ibrahim. "Lignocellulosic composite". Polymers for Advanced Technologies 15, n.º 12 (diciembre de 2004): 738–45. http://dx.doi.org/10.1002/pat.536.

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Teangtam, Sarocha, Wissanee Yingprasert y Phichit Somboon. "Production of micro-lignocellulosic fibril rubber composites and their application in coated layers of building materials". BioResources 19, n.º 1 (30 de noviembre de 2023): 620–34. http://dx.doi.org/10.15376/biores.19.1.620-634.

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Novel composite materials were made by combining micro-lignocellulosic fibrils and natural rubber applied as spray coated layers for building materials. The micro-lignocellulosic fibrils were produced based on the mechanical pulping process with jute bast as the raw material. The obtained micro-lignocellulosic fibrils had a good content of water-suspended materials with fibril widths of about 0.1 to 1.0 µm and fibril length of about 100 to 150 µm. The composites were produced using natural rubber mixed with the micro-lignocellulosic fibrils at 0, 5, and 10 parts per hundred of rubber, vulcanizing sulfur, and activated zinc oxide. The fibril-rubber suspension was formed in the composite sheets with a thickness of 0.5 to 1.5 mm using a spray coating technique and was oven-dried at 100 °C. The rubber composite had a homogenous fibril distribution in the rubber composite matrix, with good bonding between the fibrils and the rubber polymers. The fibrils contributed to the strength reinforcement of the rubber composite layers. The application of the micro-lignocellulosic fibril rubber composites coated onto industrial fiber cement boards enhanced the thermal insulation properties, which had a lower degree of thermal conductivity and heat diffusivity and enhanced the toughness and waterproofing of the fiber cement boards.

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Zhang, Kehong, Hui Xiao, Yuhang Su, Yanrong Wu, Ying Cui y Ming Li. "Mechanical and physical properties of regenerated biomass composite films from lignocellulosic materials in ionic liquid". BioResources 14, n.º 2 (8 de febrero de 2019): 2584–95. http://dx.doi.org/10.15376/biores.14.2.2584-2595.

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As an important sustainable source of biomass, lignocellulosic materials are highly recalcitrant to biotransformation, which limits their use and prevents economically viable conversion into value-added products. Ionic liquids (ILs) have emerged as attractive solvents for lignocellulosic biomass pretreatment in the production of biochemical feedstocks. In this work, a mixture of wood powder and waste paper was dissolved in the ionic liquid 1-allyl-3-methylimidazolium chloride ([AMIM]Cl). Composite films were made from the regenerated lignocellulosic materials in [AMIM]Cl by adjusting the ratio of the raw materials. The physical and mechanical properties of biomass composite films were determined by optical microscopy (OM), Fourier transform infrared (FTIR) spectra, X-ray diffraction (XRD), and tensile strength tests. The results indicated that lignocellulosic materials were dissolved in [AMIM]Cl by destroying inter- and intramolecular hydrogen bonds between lignocelluloses. With increasing waste paper cellulose content, the dissolution of the fir powder in [AMIM]Cl was accelerated, and the tensile strength and elongation at break of the composite films increased. The rate of dissolution initially rose rapidly with increasing content of waste paper cellulose content, but the rate leveled off when the content was above 40%. This research highlights new opportunities for biodegradable composite films made from waste biomass.

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Mansour, Olfat Y., Samir Kamel y Mona A. Nassar. "Lignocellulosic polymer composite IV". Journal of Applied Polymer Science 69, n.º 5 (1 de agosto de 1998): 845–55. http://dx.doi.org/10.1002/(sici)1097-4628(19980801)69:5<845::aid-app2>3.0.co;2-m.

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Monteiro, Sergio Neves, Frederico Muylaert Margem, Noan Tonini Simonassi, Rômulo Leite Loiola y Michel Picanço Oliveira. "Tensile Test of High Strength Thinner Curaua Fiber Reinforced Polyester Matrix Composite". Materials Science Forum 869 (agosto de 2016): 361–65. http://dx.doi.org/10.4028/www.scientific.net/msf.869.361.

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In recent years natural fibers, especially those lignocellulosic extracted from plants, have gained attention owing to their engineering performance as polymer composite reinforcement. It was found that some of these lignocellulosic fibers, such as the curaua, ramie and sisal may reach tensile strength above 1000 MPa in association with very thin diameters. Therefore. the objective of the present work was to fabricate polyester matrix composites with the highest tensile strength possible, by reinforcing with the thinnest continuous and aligned curaua fibers. Tensile tests results of composites reinforced with 30% volume of these thinnest curaua fibers showed a tensile strength of 135 MPa, which corresponds to one of the highest strength attained for lignocellulosic fiber composites.

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Gurupranes, S. V., I. Rajendran, S. Gokulkumar, M. Aravindh, S. Sathish y Md Elias Uddin. "Preparation, Characteristics, and Application of Biopolymer Materials Reinforced with Lignocellulosic Fibres". International Journal of Polymer Science 2023 (5 de abril de 2023): 1–22. http://dx.doi.org/10.1155/2023/1738967.

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Various environmental concerns motivate scientists and researchers to look out for unique new materials in science and technology. In order to address the demand for polymeric materials with partial biodegradability, the usage of lignocellulosic fibre in the polymer matrix has risen. Lignocellulosic fibres are a cheap, easily renewable resource that is readily available in all regions. Cellulosic plant fibres also have a plethora of possibilities for use in polymer reinforcement because of their properties. Many researchers put their effort into developing a natural polymer with better mechanical properties and thermal stability using nanotechnology and the use of natural polymers to make its composites with lignocellulosic fibres. This study provides a review of the biodegradable composite market, processing methods, matrix-reinforcement phases, morphology, and characteristic improvements. In addition, it provides a concise summary of the findings of significant research on natural fibre polymer composites (NFRCs) that have been published. Indeed, a noticeably brief discussion is provided on the significant issues faced during composite extraction as well as the challenges encountered during the machining. Recent developments in the study of lignocellulosic fibre composites or NFRCs have demonstrated their enormous potential as structural elements in vehicles, aerospace structures, buildings, ballistics, soundproofing, and other structures.

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Scarpini Cândido, Verônica, Michel Picanço Oliveira y Sergio Neves Monteiro. "Dynamic-Mechanical Performance of Sponge Gourd Fiber Reinforced Polyester Composites". Materials Science Forum 869 (agosto de 2016): 203–8. http://dx.doi.org/10.4028/www.scientific.net/msf.869.203.

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The engineering applications of natural materials to replace synthetic ones has marked increased in past decades owing to environmental, societal and economical issues. Among these natural materials, the lignocellulosic fibers obtained from plants are successfully being used as polymer composites reinforcement is substitution of the traditional glass fiber. One relatively unknown lignocellulosic fiber with potential for composite reinforcement is that extracted from the sponge gourd. In the present work, the dynamic-mechanical performance of unsaturated orthophtalic polyester matrix composites was evaluated for different volume fractions of continuous and aligned sponge gourd fiber reinforcement. The results revealed that an increasing incorporation of sponge gourd fiber improved the composite viscoelastic stiffness, while decreasing its glass transition temperature.

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Rocha, Jairo da Silva, Viviane A. Escócio, Leila LY Visconte y Élen BAV Pacheco. "Thermal and flammability properties of polyethylene composites with fibers to replace natural wood". Journal of Reinforced Plastics and Composites 40, n.º 19-20 (27 de marzo de 2021): 726–40. http://dx.doi.org/10.1177/07316844211002895.

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Composites of high-density polyethylene and lignocellulosic fiber residues from banana, papaya, and peach palm trees, in addition to sponge gourd and coconut fiber, were investigated to identify the least flammable composite as a potential substitute for natural pine wood. The high-density polyethylene/lignocellulosic fiber composites were prepared in a twin-screw extruder, injection molded to obtain specimens, and characterized in terms of thermogravimetry, flammability using the UL-94 burning test and limiting oxygen index, impact resistance and heat deflection temperature. The high-density polyethylene/sponge gourd fiber composite showed the best impact resistance and was selected for further tests, with the addition of 10wt% magnesium hydroxide and (or) rice husk ash as flame retardants. The use of both retardants provided greater thermal stability to the composite. The addition of magnesium hydroxide to the high-density polyethylene/sponge gourd fiber composite improved the flammability properties of horizontal burning and thermal stability and is a potential candidate to replace natural wood.

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Takatani, M., H. Ito, S. Ohsugi, T. Kitayama, M. Saegusa, S. Kawai y T. Okamoto. "Effect of Lignocellulosic Materials on the Properties of Thermoplastic Polymer/Wood Composites". Holzforschung 54, n.º 2 (29 de febrero de 2000): 197–200. http://dx.doi.org/10.1515/hf.2000.033.

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Summary The effect of lignocellulosic materials on the board performance of thermoplastic polymer/wood composites was examined by using soft wood flours of 20 mesh- and 120 mesh-pass, steam-exploded beech flour, and two kinds of thermoplastic polymers, polyvinyl chloride and polystyrene. Steam-exploded wood flour was found to be one of the best lignocellulosic materials in terms of fracture strength and water resistance of the composite board. The properties of the composites are dependent not only on the lignocellulosic materials and polymers, but also on the average size of wood flour. Generally, a flour of 120 mesh pass gave composites of better performance than that of 20 mesh pass, but the tendency was reversed when steam-exploded beech flour was used.

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Lilargem Rocha, Diego, Luís Urbano Durlo Tambara Júnior, Markssuel Teixeira Marvila, Elaine Cristina Pereira, Djalma Souza y Afonso Rangel Garcez de Azevedo. "A Review of the Use of Natural Fibers in Cement Composites: Concepts, Applications and Brazilian History". Polymers 14, n.º 10 (17 de mayo de 2022): 2043. http://dx.doi.org/10.3390/polym14102043.

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The use of natural lignocellulosic fibers has become popular all over the world, as they are abundant, low-cost materials that favor a series of technological properties when used in cementitious composites. Due to its climate and geographic characteristics, Brazil has an abundant variety of natural fibers that have great potential for use in civil construction. The objective of this work is to present the main concepts about lignocellulosic fibers in cementitious composites, highlighting the innovation and advances in this topic in relation to countries such as Brazil, which has a worldwide prominence in the production of natural fibers. For this, some common characteristics of lignocellulosic fibers will be observed, such as their source, their proportion of natural polymers (biological structure of the fiber), their density and other mechanical characteristics. This information is compared with the mechanical characteristics of synthetic fibers to analyze the performance of composites reinforced with both types of fibers. Despite being inferior in tensile and flexural strength, composites made from vegetable fibers have an advantage in relation to their low density. The interface between the fiber and the composite matrix is what will define the final characteristics of the composite material. Due to this, different fibers (reinforcement materials) were analyzed in the literature in order to observe their characteristics in cementitious composites. Finally, the different surface treatments through which the fibers undergo will determine the fiber–matrix interface and the final characteristics of the cementitious composite.

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Tesis sobre el tema "Lignocellulosic composite"

Padovani, Justine. "Développement d'une chaine de traitement d’images pour relier la morphologie de fibres lignocellulosiques aux propriétés de composites thermoplastiques à fibres courtes". Thesis, Reims, 2019. http://www.theses.fr/2019REIMS046.

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L’objectif global de cette thèse est de relier la morphologie des fibres lignocellulosiques aux propriétés fonctionnelles des composites thermoplastiques. Un premier axe de travail a consisté à identifier l’impact du procédé de transformation des fibres sur leurs propriétés finales, en particulier sur leur morphologie. Le second axe a concerné l’étude des liens entre les propriétés des fibres avec les propriétés mécaniques fonctionnelles des composites.Un traitement hydromécanique appliqué à des fibres de chanvre nous a fourni des lots d’échantillons contrastés en termes de morphologie et propriétés physicochimiques. Nous avons généré de la fibrillation, et la nanoindentation a montré une perte de propriétés mécaniques pariétales. Ces propriétés sont fortement corrélées au taux de cristallinité de la cellulose et aux teneurs en 3 monosaccharides : rhamnose, galactose et mannose. Le développement d’une chaine de traitement et d’analyse d’images a permis de quantifier les caractéristiques de taille, de forme et de complexité structurale des fibres à l’échelle des populations. Les caractéristiques morphologiques ont été suivies dans les composites injectés avec ou sans anhydride maléique. Les caractéristiques des mélanges et des composites ont été explorées. Deux rapports de forme (L/D) des fibres ont été distingués (avec et sans fibrillation) et ont été injectés dans des modèles de micromécanique pour évaluer l’influence des fibrillations sur la prédiction du module de Young des composites. À l’échelle du composite la contribution des fibrilles reste très modérée même si la description morphologique individuelle et de population des fibres est significativement améliorée
The global objective of this thesis is to link the morphology of linocellulosic fibres to the functional properties of composites. A first area of work consisted in identifying the impact of the fibre transformation process on its final properties, in particular on its morphology. The second axis concerned the study of the links between the properties of fibres and the functional mechanical properties of composites.A hydromechanical treatment applied to hemp fibres provided us with contrasting batches in terms of morphology and physicochemical properties. We generated fibrillation, and nanoindentation showed a loss of parietal mechanical properties. These properties are strongly correlated to the crystallinity rate of cellulose and to the contents of 3 oses: rhamnose, galactose and mannose. The development of an image processing and analysis chain has made it possible to quantify the size, shape and structural complexity of fibres at the population level. Morphological characteristics were monitored in composites injected with or without maleic anhydride. The characteristics of mixtures and composites have been explored. Two fibre aspect ratios (L/D) were distinguished (with and without fibrillation) and injected into micromechanical models to assess the influence of fibrillation on the prediction of the Young's modulus of composites. At the composite level, the contribution of fibrils remains very moderate, although the individual morphological and population description of the fibres has been significantly improved

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Al-Mohamadawi, Ali Abdullah Hassan. "Contribution à l'étude de l'impact de l'environnement vis-à-vis d'éco-matériaux lignocellulosiques". Electronic Thesis or Diss., Amiens, 2016. http://www.theses.fr/2016AMIE0040.

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De par leurs faible coût, légèreté et propriétés thermiques, les co-produits lignocellulosiques ont reçu une attention particulière pour la fabrication de bétons légers. Cependant ces co-produits ne sont pas totalement compatibles avec une matrice cimentaire, d'où un retard de prise, des variations dimensionnelles élevées et des résistances mécaniques faibles des matériaux résultants. Pour pallier ces inconvénients, un procédé d'enrobage d'anas de lin avec différentes substances a été adopté. Les composites élaborés présentent des améliorations significatives de leurs comportement hydrique et résistances mécaniques avec une augmentation modérée de masse volumique apparente et de conductivité thermique. Les phénomènes de transfert d'humidité dans les composites obtenus peuvent influencer de manière significative leur durabilité et performance. En effet la plupart des matériaux utilisés dans le bâtiment sont poreux, contenant de l'eau sous forme vapeur ou liquide. La perméabilité à la vapeur d'eau, les isothermes de sorption et la capacité tampon à la vapeur d’eau ont donc été déterminées. Les résultats obtenus montrent la bonne performance hygrique des éco-composites élaborés. Trois tests de lixiviation ont été proposés pour identifier la spéciation chimique des matériaux et évaluer leurs relargages. Les conditions expérimentales ont été choisies pour simuler différents états des composites dans des environnements externes en service ou fin de vie. Le comportement à la lixiviation des composites élaborés diffère peu selon le traitement subi par les anas et la libération de substances toxiques n'a pas été mise en évidence
Due to their low cost, lightness and thermal properties, lignocellulosic byproducts received a particular attention, in the recent years, for manufacturing lightweight concretes. However, these byproducts are not fully compatible with the cement matrix, leading to setting delay, significant dimensional variations, and low mechanical strengths of the composites elaborated. To avoid such drawbacks, a coating process of flax shives using different substances has been adopted in this study. It leads to a reduction in treated shive water absorption compared to raw shives. The composites obtained exhibit significant improvements in hydrous behavior and mechanical strengths with moderate increase in the apparent bulk density and thermal conductivity. The phenomena of moisture transfer in the produced composites can significantly influence the durability and performance of them. In fact most of the materials used in the building area are porous, containing water as vapor or liquid. Therefore the water vapour permeability, sorption isotherms and moisture buffering capacity have been determined. The results obtained show the good hygric performance of the eco-composites elaborated. Three leaching tests have been proposed in this study to identify the chemical speciation of the materials and to evaluate their releasing into the environment. The experimental conditions of the leaching tests have been chosen to simulate different states of our composites in external environments in service or end of life. The leaching behaviour of the cement-based products elaborated differs little according to flax shive treatment and the leaching of toxic substances has not been identified

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Iyer, Ananth. "Surface characterization of lignocellulosics for composite manufacture /". Search for this dissertation online, 2003. http://wwwlib.umi.com/cr/ksu/main.

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Sbiai, Adil. "Matériaux composites à matrice époxyde chargée par des fibres de palmier dattier : effet de l’oxydation au tempo sur les fibres". Thesis, Lyon, INSA, 2011. http://www.theses.fr/2011ISAL0043/document.

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A travers cette thèse, nous avons pu valoriser les rejets agricoles du palmier dattier (Phoenix L. dactylifera) (fibres issues des folioles) par leur introduction comme renfort fibreux dans la préparation des biocomposites à matrice polyépoxyde (DGEBA/IPD). Le but de la première partie de la thèse était l’étude de la modification chimique des fibres de palmier par oxydation au 2,2, 6,6–tétraméthylpipéridine-1-oxyle (TEMPO). Le suivi cinétique et la topologie de la réaction, ainsi que la caractérisation des fibres à l’état brut et à l’état oxydé, ont été aussi étudiés. Un modèle cinétique original a été proposé ensuite rendant compte du caractère hétérogène de cette réaction chimique. La deuxième partie était consacrée à l’étude cinétique et rhéocinétique de la polymérisation du système DGEBA/IPD seul et en présence de fibres brutes et oxydées. Parallèlement, l’étude thermique de la polymérisation du réseau final a été également réalisée. La dernière partie avait comme but l’étude des propriétés mécaniques aux petites et grandes déformations de ces composites et mettre en évidence l’effet de l’oxydation des fibres sur ces propriétés. D’autre part, le suivi de mise en forme par RTM (moulage par transfert de résine) a montré un effet positif de l’oxydation sur le déroulement de l’injection. Une meilleure mouillabilité du mat des fibres oxydées par la résine est à l’origine de l’amélioration du procédé
To increase in value the agricultural waste products of the date palm tree -phoenix dactylifera l-, especially the fibers from the leaflets, their use as filler in polyepoxide matrix (dgeba / ipd) was investigated to prepare new bio-based composites. Our goal in the first part is to study the chemical modification of palm fiber by oxidation mediated by 2,2,6,6-tetramethylpiperidine-1-oxyl (tempo). The kinetic and the topology of the reaction, as well as the characterization of fibres in rough and oxidized state, were also studied. An original kinetic model was proposed taking into account the heterogeneous character of this chemical reaction. The second part was devoted to study the kinetics and rheokinetic of the polymerization of dgeba / ipd with and without modified and unmodified fibers. This enabled to show the effect of the introduction of the date palm tree fibers (oxidized and non oxidized) on the composite formation. The thermal properties of the prepared composites were also investigated in this part of work. In the last part of this work, the mechanical properties of these composites were investigated and enabled to highlight the effect of the fibers oxidation on these properties. In addition, the effect of oxidation on the course of the injection during the rtm process (moulding by transfer of resin) was investigated. A positive effect of the oxidation of the fibers on the course of the injection was obtained and was attributed to the higher wettability of oxidized fibres by the resin

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Khemakhem, Marwa. "Valorisation du grignon d’olives : Utilisation comme charge dans des mélanges à matrice polymère". Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEI002.

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Cette étude est une contribution à la valorisation du grignon d’olives (GO), sous produits oléicoles à caractère lignocellulosique. La voie proposée consiste à utiliser le GO comme charge dans des polymères de grande diffusion à savoir le poly (éthylène/propylène) [CEP] d’origine fossile et le poly (acide lactique) [PLA], issu des ressources renouvelables. Les différentes formulations, CEP/GO et PLA/GO, élaborées à l’état fondu dans une extrudeuse bivis ont été étudiés du point de vue des propriétés rhéologiques, thermique, mécanique et de la morphologie. Différents tiers-corps copolymères de structures diverses ont été utilisés dans le but de promouvoir l’adhésion à l’interface des composants et/ou de réduire la dégradation du polymère matrice et améliorer les performances des systèmes composites ainsi conçus. Les observations morphologiques ont corroboré parfaitement l’ensemble des propriétés étudiées
This study is a contribution to the valorization of Olive Solid Waste (OSW) which displays a Lignocellulosic nature. The proposed approach consists in using the OSW as a filler in commodity polymers namely the poly (ethylene/propylene) [CEP] of fossil origin and the poly (lactic acid), derived from renewable resources. The different formulations, CEP/GO and PLA/GO, processed in the molten state in a twin screw extruder were studied from the side of rheological, thermal, mechanical properties and morphology. Different copolymers of various structures were used in order to promote the adhesion in the interface of the components and/or to reduce the polymer matrix degradation and to improve the composite systems performances. Morphological observations corroborated perfectly the studied properties

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Salazar, Vera Lúcia Pimentel [UNESP]. "Estudo da biodegradação das fibras de coco e de sisal visando às aplicações na indústria automotiva". Universidade Estadual Paulista (UNESP), 2005. http://hdl.handle.net/11449/101876.

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Neste trabalho são discutidos os resultados referentes aos ensaios de biodegradabilidade de fibras naturais utilizadas pela indústria auotomobilística: fibra de coco, de coco com látex e e sisal. Estes ensaios foram realizados junto ao Laboratório de Microbiologia Industrial do Agrupamento de Biotecnologia da Divisão Química do Instituto de Pesquisas Tecnológicas do Estado de São Paulo. Apresenta-se uma revisão de literatura sobre biodegradabilidade e sobre as fibras em estudo. Realizou-se a análise elementar de CHN, a qual é um pré-requisito para o Teste da Biodegradabilidade Imediata pela Medida do Dióxido de Carbono Desprendido em Sistema Aberto (norma IBAMA - E.1.1.2. - 1998). Utilizou-se também a norma DIN 53739 (1984) - Testing of Plastics - Influence of dungi and bacteria - visual evaluation - change in mass or physical properties, baseada na ISO 846 - 1978. Fez-se a determinação de extrativos totais, de lignina, de holocelulose e do teor de cinzas das fibras em estudo para se conhecer o teor ral de lignina, celulose e hemicelulose presentes e, compreender os resultados obtidos nos testes de biodegradação. A partir do teste de biodegradabilidade (IBAMA E.1.1.2.-1998), observou-se uma taxa de biodegradação de cerca de 10% para todos os materiais em estudo após 45 dias de ensaio, demonstrando difícil degradação. Nenhum material inibiu a degradação da glicose. No entanto, a porcentagem de degradação da fibra de sisal foi superior a da fibra de coco com látex, conseiderando-se o mesmo intervalo de tempo de cultivo. Quanto a esse teste, pode-se concluir que 45 dias de ensaio é pouco tempo para a biodegradação dessas fibras naturais levando-se em consideração os teores de lignina, celulose e hemicelulose encontrados por Young (1997) para a fibra de sisal e por Han e Rowell (1997) para a fibra de coco. E, analisando-se os teores de lignina, celulose...
Presented in this study are the testing results regarding the biodegradation of natural fibres utilized by automotive industry, in this case, coir and sisal fibers, where the coir fiber was used also as rubberized mat. These biodegradation testing where carried on at th Laboratory of Industrial Microbiology by the Biotechnology Group of the Chemistry Division of the Institute of Technological Research of São paulo State - IPT. Next is presented a literatura review on biodegradation and over the studied fibers, coir and sisal, besides all the details about the testing used evaluate biodegradation and its respectively obtained results. An elementary analysis of CHN was carried out, which is a prerequisite for the Immediate Biodegradation Test of the Mesaure of the Carbon Dioxide Released in Open System (standard IBAMA - E.1.1.2. - 1998). Alson used was the standard DIN 53739 - 1984 - Testing of Plastics - influence of fungi and bacteria - visual evaluation - change in mass or physical properties, established in the ISO 846 - 1978. Also was realized the determination of total extractives, lignin, holocellulose and ash contents of the studied fibers as well as the determination of it's true content and understand the obtained biodegradation testing results. There was hence observed from the biodegradation test (standard E.1.1.2.-1998) a biodegradation tax about 10% for all the studied material after 45 days of assay, which indicates a difficult degradation. None of the material inhibited the glucose degradation. However, the percentage of sisal degradation was greater than that of the coir fiber with latex. It can be concluded about this test, that a 456 day trial is a short lapse of time for the biodegradation of these natural fibers when the contents of lignin, cellulose and hemicellulose that were found by Young (1997) for the sisal fiber and by Han and Rowell... (Complete abstract click electronic access below)

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Molaba, Tshepiso Princess. "Long term effects of temperature and humidity on lignocellulosic fibres and composites". Thesis, Nelson Mandela Metropolitan University, 2015. http://hdl.handle.net/10948/10276.

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The study deals with the chemical and flame retardant (FR) treatment of woven flax fabric and preparation and characterization of flax reinforced phenolic composites. Sheets of flax fabric were subjected to chemical treatments using NaOH and silane coupling agents. A phosphate-based flame retardant (DAP) was applied to decrease the flammability of the flax fabric. The effect of the chemical treatments and FR treatments on the thermal and flammability properties of the fabric and composites was investigated using thermogravimetric analysis (TGA), vertical flame resistance test and cone calorimeter. The mechanical properties of the flax fabric and composites, before and after environmental ageing, were investigated. Ageing studies were carried out by exposing the samples in an environmental chamber at specified conditions for two weeks. TGA results showed that the treatment of the fabric with FR shifts the decomposition temperature to lower level and increases the char residue. Vertical flame resistance testing showed that FR treatment of the flax fabric improved the flammability properties. There was no after flame and afterglow observed for FR treated flax fabric due to self-extinguishment after removal of the flame. Flax Fabric without FR burned completely and there was no result for the char length due to the complete destruction of the fabric. The FR treatment, however, seemed to have had a negative effect on the tensile strength of the flax fabric. This was further intensified upon exposure of FR treated flax fabric to high temperatures during ageing studies which drastically reduced the tensile strength by more than 90%, and the flax fabric were found to be brittle and darker in visual appearance. TGA results of flax/phenolic composites showed that for composites containing chemically treated and FR treated flax fabric the decomposition temperatures shifted to lower temperatures; however there was no significant difference in the amount of char residue. Untreated flax/phenolic composites exhibited the lowest char residue. Cone calorimeter results showed that the peak heat release rate (PHRR), smoke production rate (SPR) and carbon dioxide (CO2) emission rate was reduced for the flax/phenolic composite produced using FR treated flax fabric. The tensile strength of these composites was reduced while there was an increase in modulus value. Exposure of the FR treated composites to high temperatures further reduced the tensile strength and increased the E-modulus. Both FR treated and untreated composites changed in colour and the FR treated composites were found to be brittle after exposure to high temperatures.

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David, Grégoire. "Eco-conversion de résidus lignocellulosiques de l'agriculture en matériaux composites durables à matrice biopolyester". Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTG030.

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Cette thèse consiste à développer et étudier de nouveaux matériaux composites biosourcés et biodégradables à partir de constituants dérivés des déchets de l'agriculture dans le cadre du projet européen NoAW (https://noaw2020.eu). Tous les composants sont dérivés de sous-produits agricoles : des polyhydroxyalcanoates (PHA, biopolyester bactérien et biodégradable en conditions naturelles) produits par digestion anaérobie d’effluents agricoles sont utilisés comme matrices et des fibres de sarments de vigne comme charges de renfort. Les composites sont préparés par extrusion. L'objectif de cette thèse est d'apporter de nouvelles connaissances sur les relations entre le procédé de mise en œuvre des biocomposites, leur structure et leurs propriétés fonctionnelles. Les biocomposites sont développés en considérant une balance performance-coût environnemental. Pour cela, la thèse se focalise sur 2 questions scientifiques majeures : (i) étude de l’impact de l’interface charge/matrice sur les propriétés fonctionnelles des matériaux biocomposites via pré-traitements de surface des particules lignocellulosiques ; (ii) étude de la durabilité de tels matériaux par évaluation dès la conception des impacts environnementaux. Ainsi, une attention particulière est accordée à l’interface charge/matrice, identifiée comme un facteur clé influençant les propriétés finales du composite. Un prétraitement de surface des fibres sans solvant (chromatogénie) est adapté afin de moduler l’interface charge/matrice. Cette nouvelle méthode d’estérification en voie gazeuse est tout d’abord étudiée sur des particules micrométriques de cellulose. Une fois la preuve de concept établie, elle est appliquée aux fibres lignocellulosiques, plus complexes. Les sarments de vigne, déchets agricole abondant en région Occitanie, sont étudiés comme ressource potentielle pour la production de charges de renfort. Une fois collectés et séchés, ils sont broyés en voie sèche afin d’obtenir des particules micrométriques. La variabilité de la matière première étant un des verrous concernant l’utilisation de la biomasse par les industriels, différents cépages sur plusieurs années ont été étudiés. Dans une logique de bioraffinerie, l’extraction préalable de molécules d’intérêt tels que les polyphénols est envisagée avant d’utiliser le résidu, à savoir les sarments épuisés, comme charge de renfort. L’impact environnemental des matériaux développés est évalué afin de guider les choix stratégiques et obtenir le matériau alliant à la fois performance et faible empreinte écologique. Une analyse de cycle de vie dans le cadre d’une application de barquette rigide alimentaire est réalisée en réunissant des données des acteurs de la filière. De plus, une étude de la biodégradabilité des matériaux finaux est menée. Cette thèse englobe plusieurs composantes pluridisciplinaires afin d’avoir une vision d’ensemble et décloisonnée des matériaux composites mis au point
This thesis aims at developing new fully biosourced and biodegradable composite materials from agricultural residues in the frame of the European project NoAW (https://noaw2020.eu). All the components are derived from agro-wastes: polyhydroxyalkanoates (PHA, bacterial biopolyester and biodegradable in natural conditions) produced by anaerobic digestion of agricultural effluents are used as matrix and vine shoot fibers as fillers. Biocomposites are prepared by melt extrusion. The objective of this thesis is to bring new knowledge on the relationships between the processes used to produce the fillers and the biocomposites, the resulting structure of biocomposites and their functional properties. Biocomposites are developed considering a balance between performance and environmental cost. For this purpose, the thesis focuses on 2 major scientific questions: (i) study of the impact of the filler/matrix interface on the functional properties of biocomposite materials via surface pre-treatments of lignocellulosic particles; (ii) study of the durability of such materials by assessment from the design of the environmental impacts. Thus, special attention is given to the filler/matrix interface, identified as a key factor for the final properties of the composite. A solvent-free surface pretreatment of fibers (chromatogeny) is adapted to modulate the filler/matrix interface. This new method of gas-phase esterification is first studied on micrometric particles of cellulose. Once the proof of concept is established, it is applied to lignocellulosic fibers that are more complex. The vine shoots, agricultural waste abundant in Occitania region, are studied as a potential resource for the production of fillers for composites. Once collected and dried, they are milled using dry fractionation to obtain micrometric sized particles. The variability of the raw material being one of the bottlenecks concerning the use of lignocellusoic biomass by manufacturers, different grape species over several years are studied. In a biorefinery approach, the extraction of molecules of interest, e.g. polyphenols, is considered before using the residue, namely exhausted shoots, as a reinforcing fillers. The environmental impact of the produced biocomposites is evaluated to guide strategic choices and obtain materials displaying a good balance between performance and environmental footprint. A life cycle assessment in the context of a food rigid tray application is carried out, collecting data from sector’s players. In addition, a study of the biodegradability of the final materials is conducted. This thesis encompasses multidisciplinary fields in order to have a decompartmentalized overview of the developed composite materials

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Mousa, A., G. Heinrich y U. Wagenknecht. "Thermal properties of carboxylated nitrile rubber/nylon-12 composites-filled lignocellulose materials". Sage, 2014. https://tud.qucosa.de/id/qucosa%3A35546.

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Organic hybrid composites based on carboxylated nitrile rubber and nylon-12 reinforced with mercerized and diisocyanated lignocellulose residue (LCR) was prepared. The influence of the LCR on the viscoelastic properties of these organic hybrids was investigated by dynamic mechanical analysis and thermal analysis (differential scanning calorimetry (DSC)). It is found that either the position of the damping peak was shifted to higher values or the intensity of the damping peak was significantly increased with LCR. These results could imply that the LCR enhanced the damping properties of the composites. The thermal stability of the composites was evaluated with the mean values obtained using thermogravimetrical analysis. The decomposition rate was investigated using differential thermal gravimetry. The crystallization behavior of the prepared composites was checked by DSC.

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Carmichael, Eugene. "Biorefining of nanocellulose from waste lignocelluloses using novel ionic liquid processes : feasibility of application in composites". Thesis, Queen's University Belfast, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.695266.

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With the inevitable exhaustion of supplies of oil and other fossil fuels looming on the horizon, coupled with the increasing concern regarding the environmental impact of using these resources, governments worldwide are under pressure to invest in the development of renewable replacements for fuel, as well as natural alternatives to oil based materials such as plastics. One of the main sources of interest is lignocelluloses, comprised of three main components - lignin, cellulose and hemicellulose each of which can be a valuable raw material for fuel or polymer production. The problem however is that the three components are bound together chemically, and efficient separation requires a combination of physical and chemical treatments. It is the aim of this project, therefore, to develop novel processing for the hydrolysis of lignocellulose. The process will involve the use of Ionic Liquids, essentially salts which are liquid below 100°C. While these chemicals have been known of for decades, it is only in the last twenty years or so that research into their potential as solvents, catalysts, reaction media, etc. has accelerated and interest has increased in their use in biorefining. This project is concerned specifically with novel methods incorporating an acidic, hydrophobic ionic liquid in the hydrolysis of lignocellulose with the aim being to produce nanocellulosic fibres and examine their performance as composite fillers. This began with the analysis of novel ionic liquids based on phosphonium and choline cations in the hydrolysis of wheat straw. From this the most promising medium was evaluated in its ability to refine cellulose and compared with a traditional hydrolysis method using dilute sulphuric acid. Furthermore novel lignocellulosic feedstocks, anaerobic digestate and spent mushroom compost, were analysed to determine their suitability as sources for nanocellulosic fibres which would represent an innovative use of these waste materials.

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Libros sobre el tema "Lignocellulosic composite"

Kalia, Susheel, ed. Lignocellulosic Composite Materials. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-68696-7.

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Thakur, Vijay Kumar, ed. Lignocellulosic Polymer Composites. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118773949.

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Pacific, Rim Bio-Based Symposium (1992 Rotorua N. Z. ). Pacific Rim Bio-Based Composites Symposium, Rotorua, New Zealand, 9-13 November 1992. Rotoura, N.Z: New Zealand Forest Research Institute, 1992.

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Kalia, Susheel. Lignocellulosic Composite Materials. Springer, 2017.

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Kalia, Susheel. Lignocellulosic Composite Materials. Springer, 2019.

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Chemical Modification of Lignocellulosic Materials. CRC Press LLC, 2017.

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Hon, DavidN S. Chemical Modification of Lignocellulosic Materials. CRC Press LLC, 2017.

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Hon, DavidN S. Chemical Modification of Lignocellulosic Materials. CRC Press LLC, 2017.

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Thakur, Vijay Kumar. Lignocellulosic Polymer Composites: Processing, Characterization, and Properties. Wiley & Sons, Incorporated, John, 2014.

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Thakur, Vijay Kumar. Lignocellulosic Polymer Composites: Processing, Characterization, and Properties. Wiley & Sons, Incorporated, John, 2014.

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Capítulos de libros sobre el tema "Lignocellulosic composite"

Shaker, Khubab y Yasir Nawab. "Green Composite Solutions". En Lignocellulosic Fibers, 1–9. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-97413-8_1.

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Satyanarayana, Kestur G., Thais H. S. Flores-Sahagun y Pamela Bowman. "Lignocellulosic Materials of Brazil––Their Characterization and Applications in Polymer Composites and Art Works". En Lignocellulosic Composite Materials, 1–96. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68696-7_1.

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Angellier-Coussy, H., V. Guillard, E. Gastaldi, S. Peyron y N. Gontard. "Lignocellulosic Fibres-Based Biocomposites Materials for Food Packaging". En Lignocellulosic Composite Materials, 389–413. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68696-7_10.

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Jayamani, Elammaran y Muhammad Khusairy Bin Bakri. "Lignocellulosic Fibres Reinforced Polymer Composites for Acoustical Applications". En Lignocellulosic Composite Materials, 415–44. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68696-7_11.

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Sisti, L., G. Totaro, M. Vannini y A. Celli. "Retting Process as a Pretreatment of Natural Fibers for the Development of Polymer Composites". En Lignocellulosic Composite Materials, 97–135. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68696-7_2.

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Orue, A., A. Eceiza y A. Arbelaiz. "Pretreatments of Natural Fibers for Polymer Composite Materials". En Lignocellulosic Composite Materials, 137–75. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68696-7_3.

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Sarasini, Fabrizio. "Mechanical and Thermal Properties of Less Common Natural Fibres and Their Composites". En Lignocellulosic Composite Materials, 177–213. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68696-7_4.

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Abdellaoui, Hind, Rachid Bouhfid y Abou El Kacem Qaiss. "Lignocellulosic Fibres Reinforced Thermoset Composites: Preparation, Characterization, Mechanical and Rheological Properties". En Lignocellulosic Composite Materials, 215–70. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68696-7_5.

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Kengkhetkit, Nanthaya, Thapanee Wongpreedee y Taweechai Amornsakchai. "Pineapple Leaf Fiber: From Waste to High-Performance Green Reinforcement for Plastics and Rubbers". En Lignocellulosic Composite Materials, 271–91. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68696-7_6.

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Monteiro, Sandra, Jorge Martins, Fernão D. Magalhães y Luísa Carvalho. "Lightweight Wood Composites: Challenges, Production and Performance". En Lignocellulosic Composite Materials, 293–322. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68696-7_7.

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Actas de conferencias sobre el tema "Lignocellulosic composite"

Meshram, Pawan Devidas, L. Natrayan, N. Balaji y Vinay Reddy. "Investigation of Mechanical and Thermal Properties of Bamboo Fiber Reinforced with Epoxidized Soybean Oil for Automotive Seat Bases". En Automotive Technical Papers. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2024. http://dx.doi.org/10.4271/2024-01-5009.

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<div class="section abstract"><div class="htmlview paragraph">Bamboo fibers were used as reinforcement in hardened epoxy mixes altered with ethoxylated soybean oil (ESO) to enhance the mechanical and thermal qualities. Compared to a bio-based epoxy mix, the tensile strength and modulus of the laminate with 20% bamboo fiber were higher. During thermogravity analysis (TGA) evaluation, it was discovered that the rate of deterioration peak had been moved to a warmer temperature, indicating improved thermal durability of the aggregate over the base material. The dynamic mechanical evaluation of the bio-based composite anticipated increased storage modulus and greater glass transition temperatures. High fiber–matrix adherence was visible in scanning electron morphology (SEM). Measurements of the interfacial adhesion demonstrate the hydrophilicity of the bio-based reinforced composites. The binding and effective insemination of fibers is responsible for the fiber-reinforced composite’s durability. Higher rigidity and durability were generated because the lignocellulosic biomass adhered well to the low-viscosity resin. Moreover, research on adherence in composite materials reveals that the interfaces of composite materials with bamboo fibers are becoming more hydrophilic. Sufficient mechanical hardness, stiffness, and durability are realized for automobile and industrial purposes.</div></div>

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Leal, Henrique de Almeida, Alex Sandro Babetto y Baltus Cornelius Bonse. "Properties of lignocellulosic composites of coffee husk filled polypropylene". En PROCEEDINGS OF THE 35TH INTERNATIONAL CONFERENCE OF THE POLYMER PROCESSING SOCIETY (PPS-35). AIP Publishing, 2020. http://dx.doi.org/10.1063/1.5142987.

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Fahlevi, Much Rafi, Heru Suryanto, Rr Poppy Puspitasari, Jibril Maulana y Chrisrulita Sekaradi Wiguna. "The influence of coupling agent on lnterfacial shear strength of Sansevieria cylindrica fiber-epoxy composite". En THE 2ND INTERNATIONAL CONFERENCE OF LIGNOCELLULOSE. AIP Publishing, 2024. http://dx.doi.org/10.1063/5.0184435.

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Bahanawan, Adik, Fauzi Febrianto, Nanang Masruchin y Wahyu Dwianto. "Simple fabrication methods and visualization under various lightening of transparent biomass composites (TBC)". En THE 2ND INTERNATIONAL CONFERENCE OF LIGNOCELLULOSE. AIP Publishing, 2024. http://dx.doi.org/10.1063/5.0184783.

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Titunin, Andrey, Tat'yana Vahnina y Irina Susoeva. "THE USE OF THERMAL INSULATION MATERIALS FROM LIGNOCELLULOSE INDUSTRIAL WASTE IN SOLVING THE PROBLEM OF MAINTAINING THE CARBON BALANCE". En Ecological and resource-saving technologies in science and technology. FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov, 2022. http://dx.doi.org/10.34220/erstst2021_207-212.

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Soft wood waste is mainly used for fuel purposes. Non-returnable vegetable spinning waste is currently not used in the production of products, disposed of by incineration or disposal to landfill. Emissions of carbon-containing gases are the dominant source of anthropogenic emissions into the atmosphere, which leads to disruption of the natural carbon cycle. The aim of the study is to develop a method for recycling waste spinning flax and cotton fibers and soft wood waste by producing composite thermal insulation material. Physical and mechanical parameters and thermal conductivity coefficient of composites are determined.

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Zykova, Anna, Petr Pantyukhov y Anatoly Popov. "Mechanical properties of ethylene-octene copolymer (EOC) - lignocellulosic fillers biocomposites in dependence to filler content". En VIII INTERNATIONAL CONFERENCE ON “TIMES OF POLYMERS AND COMPOSITES”: From Aerospace to Nanotechnology. Author(s), 2016. http://dx.doi.org/10.1063/1.4949698.

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Ismadi, Ariadne L. Juwono y Sasa Sofyan Munawar. "Investigation of fiber content on physical-mechanical properties of mercerized sisal(Agave Sisalana) fiber-polyester composites". En THE 2ND INTERNATIONAL CONFERENCE OF LIGNOCELLULOSE. AIP Publishing, 2024. http://dx.doi.org/10.1063/5.0184729.

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Michael A Fuqua y Chad A Ulven. "Preparation and Characterization of Polypropylene Composites Reinforced with Modified Lignocellulosic Corn Fiber". En 2008 Providence, Rhode Island, June 29 - July 2, 2008. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2008. http://dx.doi.org/10.13031/2013.24770.

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Sumarno, Agung, Agus Mudo Prasetyo, Dany Perwita Sari, Maidina y Luna Ngeljaratan. "Thermal analysis and solution of green cementitious composites model under constant and elevated temperature-a preliminary study". En THE 2ND INTERNATIONAL CONFERENCE OF LIGNOCELLULOSE. AIP Publishing, 2024. http://dx.doi.org/10.1063/5.0186685.

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Bursche, Jamile, Christiane Rieker y Patrick Beuel. "Lignocellulosic Biorefineries: Adding compost improves the biogenic catalysis of wheat straw". En 2019 International Energy and Sustainability Conference (IESC). IEEE, 2019. http://dx.doi.org/10.1109/iesc47067.2019.8976852.

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Informes sobre el tema "Lignocellulosic composite"

Borch, Thomas, Yitzhak Hadar y Tamara Polubesova. Environmental fate of antiepileptic drugs and their metabolites: Biodegradation, complexation, and photodegradation. United States Department of Agriculture, enero de 2012. http://dx.doi.org/10.32747/2012.7597927.bard.

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Many pharmaceutical compounds are active at very low doses, and a portion of them regularly enters municipal sewage systems and wastewater-treatment plants following use, where they often do not fully degrade. Two such compounds, CBZ and LTG, have been detected in wastewater effluents, surface waters, drinking water, and irrigation water, where they pose a risk to the environment and the food supply. These compounds are expected to interact with organic matter in the environment, but little is known about the effect of such interactions on their environmental fate and transport. The original objectives of our research, as defined in the approved proposal, were to: Determine the rates, mechanisms and products of photodegradation of LTG, CBZ and selected metabolites in waters exposed to near UV light, and the influence of DOM type and binding processes on photodegradation. Determine the potential and pathways for biodegradation of LTG, CBZ and selected metabolites using a white rot fungus (Pleurotusostreatus) and ADP, and reveal the effect of DOM complexation on these processes. Reveal the major mechanisms of binding of LTG, CBZ and selected metabolites to DOM and soil in the presence of DOM, and evaluate the effect of this binding on their photodegradation and/or biodegradation. We determined that LTG undergoes relatively slow photodegradation when exposed to UV light, and that pH affects each of LTG’s ability to absorb UV light, the efficiency of the resulting reaction, and the identities of LTG’sphotoproducts (t½ = 230 to 500 h during summer at latitude 40 °N). We observed that LTG’sphotodegradation is enhanced in the presence of DOM, and hypothesized that LTG undergoes direct reactions with DOM components through nucleophilic substitution reactions. In combination, these data suggest that LTG’s fate and transport in surface waters are controlled by environmental conditions that vary with time and location, potentially affecting the environment and irrigation waters. We determined that P. ostreatusgrows faster in a rich liquid medium (glucose peptone) than on a natural lignocellulosic substrate (cotton stalks) under SSF conditions, but that the overall CBZ removal rate was similar in both media. Different and more varied transformation products formed in the solid state culture, and we hypothesized that CBZ degradation would proceed further when P. ostreatusand the ᵉⁿᶻʸᵐᵃᵗⁱᶜ ᵖʳᵒᶠⁱˡᵉ ʷᵉʳᵉ ᵗᵘⁿᵉᵈ ᵗᵒ ˡⁱᵍⁿⁱⁿ ᵈᵉᵍʳᵃᵈᵃᵗⁱᵒⁿ. ᵂᵉ ᵒᵇˢᵉʳᵛᵉᵈ ¹⁴C⁻Cᴼ2 ʳᵉˡᵉᵃˢᵉ ʷʰᵉⁿ ¹⁴C⁻ᶜᵃʳᵇᵒⁿʸˡ⁻ labeled CBZ was used as the substrate in the solid state culture (17.4% of the initial radioactivity after 63 days of incubation), but could not conclude that mineralization had occurred. In comparison, we determined that LTG does not degrade in agricultural soils irrigated with treated wastewater, but that P. ostreatusremoves up to 70% of LTG in a glucose peptone medium. We detected various metabolites, including N-oxides and glycosides, but are still working to determine the degradation pathway. In combination, these data suggest that P. ostreatuscould be an innovative and effective tool for CBZ and LTG remediation in the environment and in wastewater used for irrigation. In batch experiments, we determined that the sorption of LTG, CBZ and selected metabolites to agricultural soils was governed mainly by SOM levels. In lysimeter experiments, we also observed LTG and CBZ accumulation in top soil layers enriched with organic matter. However, we detected CBZ and one of its metabolites in rain-fed wheat previously irrigated with treated wastewater, suggesting that their sorption was reversible, and indicating the potential for plant uptake and leaching. Finally, we used macroscale analyses (including adsorption/desorption trials and resin-based separations) with molecular- level characterization by FT-ICR MS to demonstrate the adsorptive fractionation of DOM from composted biosolids by mineral soil. This suggests that changes in soil and organic matter types will influence the extent of LTG and CBZ sorption to agricultural soils, as well as the potential for plant uptake and leaching.

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