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Dissertations / Theses on the topic 'Lignocellulosic composite'

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1

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 prop
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2

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
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3

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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4

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 origi
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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
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6

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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Made available in DSpace on 2014-06-11T19:31:38Z (GMT). No. of bitstreams: 0 Previous issue date: 2005-04-13Bitstream added on 2014-06-13T19:42:00Z : No. of bitstreams: 1 salazar_vlp_dr_botfca.pdf: 188370 bytes, checksum: aa41f8872ad9416ef8670387131fccce (MD5)<br>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 Inst
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7

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 calorime
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8

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 t
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9

Mousa, A., G. Heinrich, and 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 comp
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10

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 i
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11

Ramos, Rógerson Rodrigues Freire. "Desenvolvimento de compósitos de polipropileno (PP) com sabugo de milho (SM) proveniente de resíduos agrícolas." Universidade Federal da Paraí­ba, 2013. http://tede.biblioteca.ufpb.br:8080/handle/tede/443.

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Made available in DSpace on 2015-04-01T12:17:40Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 2998252 bytes, checksum: 7aaeae0143740ad4944fe7bcbc9448eb (MD5) Previous issue date: 2013-09-09<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>Polymer composites reinforced with agricultural lignocellulosic wastes have been widely studied over the years and increasingly realize the value of its use as an alternative to partial substitution of polymeric materials. Furthermore, the use of lignocellulosic materials in composite adds value to this type of waste which has be
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12

Ndata, Kanyisa. "Biochemical characterization of β-xylosidase and β-glucosidase isolated from a thermophilic horse manure metagenomic library". University of the Western Cape, 2020. http://hdl.handle.net/11394/8077.

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>Magister Scientiae - MSc<br>The complete degradation of recalcitrant lignocellulose biomass into value-added products requires the efficient and synergistic action of lignocellulose degrading enzymes. This has resulted in a need for the discovery of new hydrolytic enzymes which are more effective than commonly used ones. β-xylosidases and β-glucosidases are key glycoside hydrolases (GHs) that catalyse the final hydrolytic steps of xylan and cellulose degradation, essential for the complete degradation of lignocellulose. Functional-based metagenomics has been employed successfully for the iden
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13

Salazar, Vera Lúcia Pimentel 1972. "Estudo da biodegradação das fibras de coco e de sisal visando às aplicações na indústria automotiva /." Botucatu, 2005. http://hdl.handle.net/11449/101876.

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Orientador: Alcides Lopes Leão<br>Banca: Claudio Angeli Sansígolo<br>Banca: José Claudio Caraschi<br>Banca: Derval dos Santos Rosa<br>Banca: Elisabete Frollini<br>Resumo: 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
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14

Hanana, Fatima Ezzahra. "Effet des modifications de surface de fibres lignocellulosiques sur les propriétés morphologiques, mécaniques et physiques de composites à base de polyéthylène linéaire de basse densité par rotomoulage." Doctoral thesis, Université Laval, 2018. http://hdl.handle.net/20.500.11794/29820.

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Cette thèse se décline en six parties. Le premier volet porte sur la compréhension du procédé de rotomoulage et une description des matériaux composites à base de fibres lignocellulosiques. Le second volet comporte une revue de la littérature sur les composites produits par rotomoulage, tandis que le troisième volet se consacre à la compréhension de la modification des fibres d’érables par le polyéthylène maléisé (MAPE) en solution et son influence et de la teneur en fibre sur les propriétés morphologiques et mécaniques des composites. Le quatrième volet étudie les effets de la taille des part
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15

Bidegain, Ricardo. "Sur un amendement organo-phosphaté obtenu par traitement aux oxydes d'azote de déchets lignocellulosiques additionnés d'hydroxyapatite : valeur agronomique comparée de ce produit et du compost traditionnel." Toulouse, INPT, 1995. http://www.theses.fr/1995INPT007A.

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Lors du traitement aux oxydes d'azote de melanges de dechets organiques et de phosphate apatitique (procede humifert), la solubilisation du phosphate s'accompagne d'une degradation de la matiere organique. Apres l'etude de l'optimisation des parametres du traitement, les substances humiques obtenues sont comparees a celles obtenues par le compostage traditionnel du meme substrat. Dans la premiere partie, des residus de cellulose (papier) ou de lignine (pepins de raisin deshuiles) ont ete traites aux oxydes d'azote en presence de deux doses de phosphore sous forme d'apatite (p#2o#5 6% et 12% de
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16

Razera, Ilce Aiko Tanaka. "Fibras lignocelulósicas como agente de reforço de compósitos de matriz fenólica e lignofenólica." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-25102007-105313/.

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Neste trabalho, fibras lignocelulósicas de diferentes fontes (bananeira e coco) foram utilizadas como agentes de reforço na preparação de compósitos de matriz fenólica e lignofenólica. O fenol, utilizado na formulação da matriz, foi substituído parcial e totalmente por lignina, extraída do bagaço de cana de açúcar por processo Organosolve, na preparação dos termorrígidos lignofenólicos. Os polímeros foram moldados sob compressão e aquecimento controlados. Para caracterização das fibras lignocelulósicas, além da análise da composição, foram utilizadas as seguintes técnicas: difração de raios-X,
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17

Tonoli, Gustavo Henrique Denzin. "Fibras curtas de Eucalipto para novas tecnologias em fibrocimento." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-18022010-142936/.

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Este trabalho avalia as vantagens do uso das fibras curtas de polpa de Eucalipto tanto como alternativa às fibras longas de polpa de Pinus, como também para fibras sintéticas, tradicionalmente usadas no reforço de materiais cimentícios. Os efeitos da morfologia (comprimento, largura, fibrilação, conteúdo de finos, número de fibras por grama, etc.) das fibras celulósicas no processamento, no desempenho mecânico e físico e na microestrutura dos compósitos de fibrocimento foram avaliados. Os compósitos foram avaliados antes e após ciclos de envelhecimento acelerado. Fibras de Eucalipto apresentar
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18

Kosappallyillom, Muraleedharan Praveen. "Studies on O2 plasma modification and fluoroalkyl functional siloxane (FAS) coating effects on natural lignocellulosic coir fibers and development of coir based polypropylene (PP)/ethylene-propylene-diene rubber (EPDM) composites." Thesis, Lorient, 2018. http://www.theses.fr/2018LORIS495/document.

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Au cours des dernières années, le développement de matériaux composites avancés fabriqués à partir de fibres naturelles a été principalement axé sur l'obtention de matériaux à haut module et à haute résistance. Cependant, la résistance élevée n'est pas suffisante, car certains des matériaux possèdent une nature fragile (l'allongement à la rupture est faible), et l'un des critères de performance les plus importants devrait être la capacité à absorber l'énergie et à résister aux chocs. La manière dont un matériau composite se déforme et subit des endommagements dépend à la fois des propriétés ch
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Teixeira, Ronaldo Soares. "Utilização de resíduos sucro-alcooleiros na fabricação de fibrocimento pelo processo de extrusão." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-18112010-112218/.

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Este trabalho avalia a utilização de fibras e cinzas de bagaço de cana-de-açúcar em compósitos cimentícios extrudados. Visa o estudo da potencialidade do emprego da fibra e cinza do bagaço da cana-de-açúcar na construção civil, o aproveitamento deste produto em matrizes cimentícias representa uma alternativa para diminuição de gastos com locais para deposição do resíduo evitando a degradação do meio ambiente. A cinza de bagaço de cana-de-açúcar apresenta características pozolânicas, além de garantir uma redução do consumo de cimento. Fibras de bagaço de cana-de-açúcar (FBC) foram classificadas
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Bhadriraju, Vamsi Krishna. "ENZYME-BASED PRODUCTION OF NANOCELLULOSE FROM SOYBEAN HULLS AS A GREEN FILLER FOR RUBBER COMPOUNDING." University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1606941104724784.

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21

Muraille, Loïc. "Comportement physicochimique des polymères pariétaux à l’échelle supramoléculaire dans des assemblages bioinspirés de la paroi végétale : application à la fibre native." Thesis, Reims, 2014. http://www.theses.fr/2014REIMS039.

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En raison des enjeux écologiques actuels, l'utilisation de ressources lignocellulosiques dans l'élaboration de matériaux composites suscite actuellement un intérêt grandissant. Au-delà des applications traditionnelles (papier, panneaux composites, textiles…), les ressources lignocellulosiques constituent une alternative durable aux ressources fossiles pour la production de biocarburant ou d'agrocomposites à base de fibres végétales. Ainsi, si l'on souhaite optimiser les performances de ces nouveaux composites, il est nécessaire de mieux connaitre les propriétés de la fibre et par conséquent ré
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22

Silva, Luiz Claudio Ferreira da. "Utiliza??o de res?duo lignocelul?sico na obten??o de chapa de madeira aglomerada homog?nea e comp?sito refor?ado com fibra de vidro-E." Universidade Federal do Rio Grande do Norte, 2008. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12719.

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Made available in DSpace on 2014-12-17T14:06:58Z (GMT). No. of bitstreams: 1 LuizCFS.pdf: 3453741 bytes, checksum: a917d4da21cccce053bc103345ba7ee6 (MD5) Previous issue date: 2008-07-10<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>This research is about the use of the coconut?s endocarp (nucifera linn) and the waste of derivatives of wood and furniture as raw material to technological use. In that sense, the lignocellulosic waste is used for manufacture of homogeneous wood sheet agglomerate (LHWS) and lignocellulosic load which take pa
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Tétaz, Franck. "Action d'enzymes bactériennes isolées à partir d'un pseudomonas sur des modèles de la lignine de sous-structure [bêta]-O-4 et des préparations de lignines de "bois explosé" : approche par résonance magnétique nucléaire." Grenoble 1, 1988. http://www.theses.fr/1988GRE10052.

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24

Kolosick, Paul Christopher. "Interfacial adhesion in lignocellulosic-polypropylene composites." 1992. http://catalog.hathitrust.org/api/volumes/oclc/28706433.html.

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1992.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 205-209).
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Prabawa, Sigit Baktya. "Lignocellulosic fiber plastic composites using sisal fibers from Indonesia." 1996. http://catalog.hathitrust.org/api/volumes/oclc/36287889.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 1996.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 71-75).
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26

Angelini, Stefania. "Exploitation of Lignocellulosic Biowastes in the Production of Bio-Composites." Tesi di dottorato, 2017. http://www.fedoa.unina.it/11552/1/Angelini_Stefania_XXIX.pdf.

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This Ph.D. thesis deals with the exploitation of lignocellulosic industrial biowastes as potential reinforcing agents and flame retardants in sustainable polymer matrices, with the aim of obtaining bio-composites with improved properties and reduced production costs. The work is based on two main activities, the first one involved a lignocellulosic biowaste (LC) from a second generation bioethanol production process, while lignosulfonates (LS) from pulp and paper industry were used in the second one. In the first activity, LC was submitted to a thorough morphological, chemical and thermal cha
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Zauscher, Stefan. "Orienting lignocellulosic fibers by means of a magnetic field." Thesis, 1992. http://hdl.handle.net/1957/36066.

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Controlling the orientation and spatial distribution of discontinuous fibers in composite materials enables product properties to be tailored to anticipated use. Electric fields are already (albeit rarely) used to affect alignment in lignocellulosic (LC) fiber composites. The use of magnetic fields has not, however, been suggested or explored; this is apparently because LC fibers are essentially non-magnetic. The approach may offer, however, some considerable advantages, as long as ferromagnetism may be imparted to the fibers. In the present research several fiber modification processes were c
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Tu, Shiau-Rung, and 涂曉蓉. "Processing and Characterization of PLA Composites Reinforced with Lignocellulosic Fiber Prepared from Wood Particles." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/47pm5a.

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碩士<br>國立臺北科技大學<br>有機高分子研究所<br>97<br>Poly (lactic acid) (PLA) is a commercially available biodegradable polymer derived from renewable resources. PLA offers a potential alternative to petrochemical-based plastics in many applications; however, the relatively high price, brittleness, and low toughness of PLA limit it wide application, with renewable biofiber provides a convenient approach to tailor the material cost and engineer the material properties. In this study, environmentally friendly biocomposites, composed of PLA and wood fibers derived from Acacia confusa wood powders, were prepared w
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Kuo, Jin-Rong, and 郭晉榕. "Carbon-Silicon Composites Prepared from Recycled Silicon and Lignocellulose for Negative Electrodes of Li-ion Batteries." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/uuncbk.

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碩士<br>國立臺灣大學<br>化學工程學研究所<br>105<br>Silicon has the potential to replace the graphite as the anode material for Li-ion batteries due to its high specific capacity and appropriate working voltage. However, the dramatic volume change during the Li-ion insertion and extraction has caused the poor cyclic stability. To improve the cyclic stability of Si anode, we embedded Si into a carbon matrix to form a Si-C composites. In this study, we employed the silicon particles recovered from the silicon ingot slicing slurries and the biomass (lignin and lignocellulose), which are by-products of pulp indust
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Simões, Alexandre Filipe Vaz. "Desenvolvimento sustentável de compósitos reforçados com resíduo de cerveja." Master's thesis, 2021. http://hdl.handle.net/10316/97941.

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Dissertação de Mestrado em Química apresentada à Faculdade de Ciências e Tecnologia<br>Ao longo dos anos, têm aumentado os esforços para tornar o mundo mais sustentável devido à crescente preocupação ambiental e escassez de fontes não renováveis, através do reaproveito de subprodutos industriais e produção de materiais ecológicos. As fibras lignocelulósicas devido à sua abundância e elevado potencial como fonte renovável têm gerado interesse para a produção de novos materiais sustentáveis. Assim, surge o interesse do aproveitamento do principal subproduto da indústria, o resíduo de cervejeir
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