Download or read book Improvement of selected properties of Wood Polymer Composites WPC Silane modification of wood particles written by Timo Grüneberg and published by Cuvillier Verlag. This book was released on 2010-11-22 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wood Polymer Composites are a new group of hybrid materials, which combine the advantages of synthetic polymers such as polyolefines and natural polymers such as wood; whereas the synthetic polymer is used as matrix material and the wood as reinforcement material or filler. As matrix material, principally every thermoplastic polymer with a processing temperature below 200°C can be used due to the temperature sensivity of wood. Wood Polymer Composites are processed typically with processing technologies from the plastic industry such as extrusion and injection molding. The present study was conducted to explore the possibility of wood particle modification with different types of silanes. It was the aim to contribute the silanes as compatibilizers or coupling agent and therefore improve the mechanical properties and the resistance against water. Norway spruce (Picea abies) as representative wood species was used in three different particle types. The size distribution for the wood particles ranges from 70-2500 µm. Four commercial available silanes with various functional groups (amino, di-amino, alkyl) were used as modification agents. The concentrations varied between 1.5%, 3.0%, 4.5% and 7.5%. As reference system commonly used maleated acid anhydride based coupling agents were used. The pre-treated wood particles were compounded via extrusion with polypropylene and samples were produced via injection and compression molding. The following properties were tested; tensile, bending, and impact strength, water uptake (cold and boiling water test), descent rate, weathering tests and durability test against basidiomycetes. SEM-EDX investigations proved the presence of silane either in the cell wall structure, or on the wood particle surface. Due to the structure and the functionality of the silanes it was expected that the silane treated wood particles are able to improve the mechanical properties. It was shown that the silanes had no significant effect as compatibilizer or coupling agent. The mechanical properties strongly increase with the usage of coupling agent. Both coupling agents were based on maleic acid anhydride grafted on a polymer backbone, whereas Type I reaches an optimum regarding the mechanical properties at 3%, the coupling agent Type II still improves the mechanical properties up to a ratio of 4.5% with no clear optimum. The silane pretreatment influences the improvement not significantly, compare to the improvement caused by the coupling agent. The used wood particles showed mechanical degradation during the compounding process. The biggest degradation was monitored for the wood particles of Lignocel® Type 9. Due to its fine structure it can be assumed that the Arbocel® C100 wood particles consist of only cell wall fragments of the wooden cell wall, which express a better resistance against mechanical destruction during the process. The Wood Polymer Composites showed a lower decay rate compared to solid wood. The moisture content within the Wood Polymer Composite samples ranges at the low optimum level for fungi attack and were not significantly improved by an accelerated wetting before the test. The core remains relatively dry. The main protection seems to come from the encapsulation by the polymer. The weathered Wood Polymer Composite samples showed a strong color change within a relatively short period of exposure. The color changed independently from the silane type or the silane ratio. Also an increase of cracks and gaps on the sample surface was observed compared to the unexposed sample and the pure polymer reference.

Download or read book Improvement of Selected Properties of Wood Polymer Composites WPC Silane Modification of Wood Particles written by Timo Grüneberg and published by . This book was released on 2010 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bioenergy from Dendromass for the Sustainable Development of Rural Areas written by David Butler Manning and published by John Wiley & Sons. This book was released on 2015-09-03 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on the results of two bioenergy research initiatives in Germany, this reference examines the sustainable management of wood biomass in rural areas. The large number of participating organizations and research institutes ensures a balanced and unbiased view on the potentials and risks is presented, taking into account economic, ecological, and social aspects. Most of the results reported are available here for the first time in English and have been collated in central Europe, but are equally applicable to other temperate regions. They highlight best practices for enhancing dendromass potential and productivity, while discussing the implications on rural economies and ecosystems.

Download or read book Wood Polymer Composites written by K O Niska and published by Elsevier. This book was released on 2008-05-29 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wood-polymer composites (WPC) are materials in which wood is impregnated with monomers that are then polymerised in the wood to tailor the material for special applications. The resulting properties of these materials, from lightness and enhanced mechanical properties to greater sustainability, has meant a growing number of applications in such areas as building, construction and automotive engineering. This important book reviews the manufacture of wood-polymer composites, how their properties can be assessed and improved and their range of uses. After an introductory chapter, the book reviews key aspects of manufacture, including raw materials, manufacturing technologies and interactions between wood and synthetic polymers. Building on this foundation, the following group of chapters discusses mechanical and other properties such as durability, creep behaviour and processing performance. The book concludes by looking at orientated wood-polymer composites, wood-polymer composite foams, at ways of assessing performance and at the range of current and future applications. With its distinguished editors and international team of contributors, Wood-polymer composites is a valuable reference for all those using and studying these important materials. Provides a comprehensive survey of major new developments in wood-polymer composites Reviews the key aspects of manufacture, including raw materials and manufacturing technologies Discusses properties such as durability, creep behaviour and processing performance

Download or read book Influence of Wood Modification on the Properties of Polyvinyl Chloride based Wood Polymer Composites WPC written by Marcus Müller and published by Cuvillier Verlag. This book was released on 2012-07-11 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract The study investigated the influences of wood modification on the properties of Polyvinyl chloride (PVC) based Wood Polymer Composites (WPC). Various ethanolamines, L-arginine, pre-hydrolyzed and monomeric aminosilane, melamine and acetic anhydride treatment were used to improve the adhesion between wood and polymer as well as water absorption behavior and resistance to basidiomycetes. Amine based treatments were chosen to change the nature of wood from acidic to basic in order to increase the compatibility with the acidic polymer. Treated and untreated wood flour, PVC and additives were dry blended in a mixer. The dry blend was compounded to granulate by counter-rotating twin screw extrusion and compression moulded into panels using a hydraulic press. Elemental analysis (nitrogen content) via gas chromatography showed expected fixation of aminosilane and melamine treatment. The nitrogen fixation of ethanolamine and L-arginine treated material were obviously reduced, whereas the amount and reactivity of the aminogroups influenced the fixation behavior. With increasing content of amino-groups and reactivity, the fixation was improved. Fourier transform infrared (FTIR) analyses revealed interactions between monoethanolamine and cell wall components. The amine based treatments changed the nature of wood from acidic to basic. An improvement of the interphase was detected via mechanical property testing. Tensile strength, elongation at break and unnotched impact strength of the composite were obviously increased by Larginine, ethanolamine and aminosilane treatments. It has to be considered that amine based treatments (monoethanolamine in this study) led to reduced thermal stability of the composite. Thermogravimetric analysis showed a decrease of onset temperature with increasing monoethanolamine content. Water repellence of the composite was improved by melamine, pre-hydrolyzed aminosilane and acetic acid treatment. Treated and untreated composites revealed high resistance against basidiomycetes. Due to the low initial moisture content and low weight loss of untreated and treated composites, no effect of the various modifications was distinguished. In general it is possible to treat/modify PVC/wood flour composites with used processing and chemical agents. Amine based treatments indicate an improved adhesion between wood and polymer and can be used as coupling agents. Acetic anhydride, melamine and prehydrolyzed aminosilane treatments improved water absorption behavior. Zusammenfassung In der vorliegenden Arbeit wurden die Auswirkungen verschiedener Holzmodifizierungen auf die Eigenschaften von Polyvinylchlorid (PVC) basierten Holz-Kunststoff Kompositen untersucht. Der Fokus lag dabei auf Verbesserung der Interphase zwischen Holz und Polymer, sowie einer Reduktion der Wasseraufnahme und einer Erhöhung der biologischen Dauerhaftigkeit des Komposits. Als Modifizierungschemikalien wurden Ethanolamine (Mono-, Di-, Triethanolamin), L-Arginin, Aminosilane, Melamin und Essigsäureanhydrid verwendet. Die eingesetzten Aminosilane unterschieden sich hinsichtlich ihrer Molekülgröße vor der Behandlung (Monomer, vor-hydrolisiert). Amin basierte Chemikalien wurden ausgewählt, um die Ladungseigenschaften des Holzes zu verändern. Eine bessere Kompatibilität zwischen dem sauren Polymer und der basisch modifizierten Holzoberfläche sollte dementsprechend erreicht werden. Das behandelte und unbehandelte Holzmehl wurde mit dem PVC und ausgewählten Additiven im Heiz-Kühl Mischer zu einem Trockengemisch verarbeitet. Das Trockengemisch wurde in einem gegenläufigen Doppelschneckenextruder granuliert und anschließend im Heißpressverfahren zu Platten gepresst. Mittels einer gaschromatischen Elementaranalyse wurde der Stickstoffgehalt der Holzmehlproben ermittelt, um Aussagen über die Fixierung der jeweiligen Chemikalie treffen zu können. Aminosilan und Melamin behandelte Proben zeigten die erwarteten Fixierungswerte. Die Stickstofffixierung der Ethanolamin und L-Arginin behandelten Proben war im Vergleich dazu deutlich reduziert. Allerdings wurde beobachtet, dass mit steigender Aminogruppenanzahl und Reaktivität auch die Fixierung zunahm. In Fourier Transform Infrarot (FTIR) Analysen wurden Interaktionen zwischen Monoethanolamin und den chemischen Zellwandkomponenten beobachtet. Zudem führte die Behandlung mit Aminosilanen, Ethanolaminen und dem L-Arginin zu einer pH-Wert Verschiebung. Die behandelten Proben besaßen basische Eigenschaften. Eine Verbesserung der Interphase wurde nach der Durchführung mechanischer Eigenschaftsprüfungen gemessen. Die Zugfestigkeit, Bruchdehnung und Schlagzähigkeit der Komposite wurden deutlich erhöht, wenn das Holzmehl zuvor mit Aminosilanen, Ethanolaminen oder L-Arginin behandelt wurde. Allerdings wurde die thermische Stabilität des Komposits durch die Behandlung (Monoethanolamin) herabgesetzt. Thermogravimetrische Analysen (TGA) zeigten eine reduzierte Zersetzungstemperatur mit steigendem Monoethanolamingehalt. Die Behandlung mit Essigsäureanhydrid und Melamin führte zu einer Verringerung der Wasseraufnahmegeschwindigkeit, sowie zu einer Reduzierung der maximalen Materialfeuchte. Bezüglich der verwendeten Aminosilane wurde nur bei der vor-hydrolisierten Variante eine Verbesserung des Wasseraufnahmeverhaltens beobachtet. Alle Komposite wiesen eine hohe Resistenz gegenüber Basidiomyceten auf. Aufgrund der niedrigen Feuchtegehalte vor Versuchsbeginn und den geringen Masseverlusten wurden keine Effekte der jeweiligen Behandlung festgesellt. Prinzipiell ist es möglich mit den verwendeten Chemikalien und Verarbeitungsverfahren Modifizierungen an PVC basierten Holz-Kunststoff Kompositen durchzuführen. Amin basierte Behandlungen zeigten eine erhöhte Kompatibilität mit dem Polymer, womit sie grundsätzlich als Haftvermittler eingesetzt werden können. Zudem wurde das Wasseraufnahmeverhalten der Komposite durch die Behandlung mit Essigsäureanhydrid, Melamin und vorhydrolisiertem Aminosilan positiv beeinflusst.

Download or read book Advances in Manufacturing Technology written by Somashekhar S. Hiremath and published by Springer. This book was released on 2019-04-17 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume comprises select papers presented at the International Conference on Advances in Manufacturing Technology (ICAMT 2018). It includes contributions from different researchers and practitioners working in the field of advanced manufacturing technology. This book covers diverse topics of contemporary manufacturing technology including material processes, machine tools, cutting tools, robotics and automation, manufacturing systems, optimization technologies, 3D scanning and re-engineering, and 3D printing. Computer applications in design, analysis, and simulation tools for solving manufacturing problems at various levels starting from material designs to complex manufacturing systems are also discussed. This book will be useful for students, researchers, and practitioners working in the field of manufacturing technology.

Download or read book Wood Polymer Composites written by Sanjay Mavinkere Rangappa and published by Springer. This book was released on 2022-04-29 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprehensively covers the different topics of wood polymer composite materials mainly synthesis methods for the composite materials, various characterization techniques to study the superior properties and insights on potential advanced applications. It also discusses the chemistry, fabrication process, properties, applications, recycling and life cycle assessment of wood polymer composites. This is a useful reference source for both engineers and researchers working in composite materials science as well as the students attending materials science, physics, chemistry and engineering courses.

Download or read book Advances in Wood Composites II written by Antonios N. Papadopoulos and published by MDPI. This book was released on 2020-11-09 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wood composites have shown very good performance and substantial service lives when correctly specified for the exposure risks present. The selection of an appropriate product for the job should be accompanied by decisions about the appropriate protection, whether this is by design, by preservative treatment, or by wood modification techniques. This Special Issue, “Advances in Wood Composites II”, presents recent progress in enhancing and refining the performance and properties of wood composites by chemical and thermal modification and the application of smart nanomaterials. Such enhancements and refinements have made wood composites a particular area of interest for researchers. In addition, this Special Issue reviews some important aspects in the field of wood composites, with particular focus on their materials, applications, and engineering and scientific advances, including solutions inspired biomimetically by the structure of wood and wood composites. This Special Issue, as a collection of 14 original contributions, provides selected examples of recent advances in wood composites.

Download or read book Progress in Adhesion and Adhesives Volume 4 written by K. L. Mittal and published by John Wiley & Sons. This book was released on 2019-07-01 with total page 463 pages. Available in PDF, EPUB and Kindle. Book excerpt: A solid collection of interdisciplinary review articles on the latest developments in adhesion science and adhesives technology With the ever-increasing amount of research being published, it is a Herculean task to be fully conversant with the latest research developments in any field, and the arena of adhesion and adhesives is no exception. Thus, topical review articles provide an alternate and very efficient way to stay abreast of the state-of-the-art in many subjects representing the field of adhesion science and adhesives. Based on the success of the preceding volumes in this series "Progress in Adhesion and Adhesives"), the present volume comprises 9 review articles published in Volume 6 (2018) of Reviews of Adhesion and Adhesives. The subject of these reviews fall into the following general areas: 1. Adhesion to wood and wood bonds 2. Adhesive joints 3. Adhesion in microelectronic packaging 4. Surface modification 5. Contact angle, wettability and surface free energy. The topics covered include: Adhesion phenomena in microelectronic packaging; adhesives for wood and lignocellulosic materials; adhesion to wood and lignocellulosic materials; adhesively bonded lap joints having bi-adhesive and modulus-graded bondlines; adhesion between compounded elastomers; applications of contact angle measurements in pharmaceuticals and foods; oxygen or ammonia plasma treatment of polyolefin surfaces; surface free energy determination of powders and particles; wood bonds; and dispersion adhesion forces between macroscopic objects.

Download or read book Advances in Wood Composites written by Antonios N. Papadopoulos and published by MDPI. This book was released on 2020-04-17 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wood composites have shown very good performance, and substantial service lives when correctly specified for the exposure risks present. Selection of an appropriate product for the job should be accompanied by decisions about the appropriate protection, whether this is by design, by preservative treatment or by wood modification techniques. This Special Issue, Advances in Wood Composites presents recent progress in enhancing and refining the performance and properties of wood composites by chemical and thermal modification and the application of smart nanomaterials, which have made them a particular area of interest for researchers. In addition, it reviews some important aspects in the field of wood composites, with particular focus on their materials, applications, and engineering and scientific advances, including solutions inspired biomimetrically by the structure of wood and wood composites. This Special Issue, with a collection of 13 original contributions, provides selected examples of recent Advances in Wood Composites

Download or read book Epoxy Composites written by Debdatta Ratna and published by iSmithers Rapra Publishing. This book was released on 2007-08 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Natural and Wood Fibre Reinforcement in Polymers written by A. K. Bledzki and published by iSmithers Rapra Publishing. This book was released on 2002 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report examines the different fibre types available and the current research. The authors have cited several hundred references to the latest work on properties, processing and applications. The different methods of fibre pretreatment are examined, together with fibre properties, chemistry and applications. This review is accompanied by summaries of papers from the Rapra Polymer Library database.

Download or read book Nanoclay Reinforced Polymer Composites written by Mohammad Jawaid and published by Springer. This book was released on 2016-08-12 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is part of a two-volume book series that exhaustively reviews the key recent research into nanoclay reinforced polymer composites. This second volume focuses on nanoclay based nanocomposites and bionanocomposites fabrication, characterization and applications. This includes classification of nanoclay, chemical modification and processing techniques of nanocomposites. The book also provides comprehensive information about nanoclay modification and functionalization; modification of nanoclay systems, geological and mineralogical research on clays suitability; bio-nanocomposites based on nanoclays; modelling of mechanical behaviour of halloysite based composites; mechanical and thermal properties of halloysite nanocomposites; the effect of Nanoclays on gas barrier properties of polymers and modified nanocomposites. This book is a valuable reference guide for academics and industrial practitioners alike.

Download or read book Particulate filled Polymer Composites written by Roger N. Rothon and published by Addison Wesley Longman. This book was released on 1995 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Silane Coupling Agents written by Edwin P. Plueddemann and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: * It has been rumored that a bumble bee has such aerodynamic deficiencies that it should be incapable of flight. Fiberglass-reinforced polymer com posites, similarly, have two (apparently) insurmountable obstacles to per formance: 1) Water can hydrolyze any conceivable bond between organic and inorganic phase, and 2) Stresses across the interface during temperature cycling (resulting from a mismatch in thermal expansion coefficients) may exceed the strength of one of the phases. Organofunctional silanes are hybrid organic-inorganic compounds that are used as coupling agents across the organic-inorganic interface to help overcome these two obstacles to composite performance. One of their functions is to use the hydrolytic action of water under equilibrium condi tions to relieve thermally induced stresses across the interface. If equilib rium conditions can be maintained, the two problems act to cancel each other out. Coupling agents are defined primarily as materials that improve the practical adhesive bond of polymer to mineral. This may involve an increase in true adhesion, but it may also involve improved wetting, rheology, and other handling properties. The coupling agent may also modify the inter phase region to strengthen the organic and inorganic boundary layers.

Download or read book Reinforcement of Polymer Nano Composites written by T. A. Vilgis and published by Cambridge University Press. This book was released on 2009-08-13 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides in-depth coverage of the physics behind elastomer reinforcement, in particular the use of reinforcing fillers in high-performance rubber.

Download or read book Wood Modification written by Callum A. S. Hill and published by John Wiley & Sons. This book was released on 2007-02-06 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is exclusively concerned with wood modification, although many of these processes are generic and can be applied to other lignocellulosic materials. There have been many rapid developments in wood modification over the past decade and, in particular, there has been considerable progress made in the commercialisation of technologies. Topics covered include: The use of timber in the 21st century Modifying the properties of wood Chemical modification of wood: Acetic Anhydride Modification and reaction with other chemicals Thermal modification of wood Surface modification Impregnation modification Commercialisation of wood modification Environmental consideration and future developments This is the first time that a book has covered all wood modification technologies in one text. Although the book covers the main research developments in wood modification, it also puts wood modification into context and additionally deals with aspects of commercialisation and environmental impact. This book is very timely, because wood modification is undergoing huge developments at the present time, driven in part by environmental concerns regarding the use of wood treated with certain preservatives. There has been considerable commercial interest shown in wood modification over the past decade, with products based upon thermal modification, and furfurylation now being actively being marketed. The next few years will see the commercialisation of acetylation and impregnation modification. This is a new industry, but one that has enormous potential. This book will prove useful to all those with an interest in wood modification including researchers, technologists and professionals working in wood science and timber engineering, wood preservation, and well as professionals in the paper and pulp industries, and those with an interest in the development of renewable materials.