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This Special Issue of Polymers is a collection of 11 original high-quality scientific contributions on basic and applied research in the field of wood science and technology, and provides good examples of the recent challenges related to the production and application of wood and wood-based materials. The Special Issue includes individual papers concerned with the enhancement of the performance and technological properties of wood composites, above all plywood, as well as with the ignition and combustion of wood and wood composites in monitoring and evaluating these processes on state-of-the-art equipment, and monitoring chemical changes in wood and wood adhesives and composites. The topic of the Special Issue has clearly resonated with the world’s scientific community and the responses have come from traditionally strong wood research centers in Europe and Asia.

plywood --- veneer 3D moldability --- natural fiber reinforcement --- wood–plastic composite (WPC) --- silicone --- mechanical properties --- cytotoxicity --- casting --- ageing --- veneer --- laser-cut --- additive manufacturing --- wood composite --- birch plywood --- molecular weight --- phenol-formaldehyde resin --- soft-rot --- weathering stability --- wood-based panels --- high-density fiberboards --- bio-adhesives --- ammonium lignosulfonate --- zero-formaldehyde emission --- tropical wood --- non-isothermal thermogravimetry --- deconvolution of thermogravimetry runs --- cone calorimetry testing --- heat-release rate --- OSB --- heat flux density --- ignition time --- weight loss --- meranti --- padauk --- merbau --- thermal treatment --- wood lignin --- eco-panel --- small ignition initiator --- straw --- relative burning rate --- fire properties --- spruce wood --- cellulose --- hemicelluloses --- lignin --- extractives --- time of storage --- fiber characteristics --- torrefied wood --- fuel --- combustion --- heat release rate --- n/a --- wood-plastic composite (WPC)

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Materials with sound-absorbing or sound-insulating properties have been rapidly evolving in recent years for several reasons. On one side, there is the ever-increasing awareness of the adverse effects that noise and lack of acoustic comfort may have on human health. On the other, the availability of more sophisticated fabrication techniques, calculation methods, and new materials, has stimulated researchers and, more and more frequently, industry to develop customized materials with improved properties.This book collects contributions from different researchers covering several topics. A group of papers investigated the use of 3D printing to obtain perforated panels with extended frequency response, as well as to ideally design an optimized cell distribution to print (when fabrication techniques will make it possible) a porous material with a broader sound absorption. The role of the geometrical and microstructural properties of granular molecular sieves is investigated by another paper. A second group of papers focused its attention on the use of natural or recycled components to create a skeleton of porous materials with good sound-absorbing properties and low environmental impact. Cigarette butts, recycled textile waste, and almond skins have been investigated by different authors.Finally, the last batch of papers included a review of sound insulation properties of innovative concretes and two research papers focussing on a numerical and experimental analysis of wood plastic composite (WPC) panels and on the potential of semi-active solutions employing compressible constrained layer damping (CCLD).

Technology: general issues --- perforated panel --- absorber array --- low frequency absorption --- sound absorber --- cigarette butts --- sustainable material --- recycling --- variability analysis --- textile waste --- biopolymers --- sound absorption --- sustainable materials --- circular economy --- polyurethane foam --- thermal property --- phase change material --- flame retardant --- perforated plates with extended tubes --- porous materials --- periodic absorber --- wood plastic composite --- transmission loss --- radiation efficiency --- orthotropic panel --- wavenumber analysis --- molecular sieve pellets --- impedance tube --- sound transmission loss --- semi-active damping --- sandwich panel --- morphing structure --- compressible constrained layer damping --- composite materials --- anisotropic materials --- optimized absorption --- diffuse field --- graded properties --- agro-waste --- hygrothermal performances --- concrete --- noise --- acoustic properties --- sound-absorbing --- sound-reflecting --- n/a

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Materials with sound-absorbing or sound-insulating properties have been rapidly evolving in recent years for several reasons. On one side, there is the ever-increasing awareness of the adverse effects that noise and lack of acoustic comfort may have on human health. On the other, the availability of more sophisticated fabrication techniques, calculation methods, and new materials, has stimulated researchers and, more and more frequently, industry to develop customized materials with improved properties.This book collects contributions from different researchers covering several topics. A group of papers investigated the use of 3D printing to obtain perforated panels with extended frequency response, as well as to ideally design an optimized cell distribution to print (when fabrication techniques will make it possible) a porous material with a broader sound absorption. The role of the geometrical and microstructural properties of granular molecular sieves is investigated by another paper. A second group of papers focused its attention on the use of natural or recycled components to create a skeleton of porous materials with good sound-absorbing properties and low environmental impact. Cigarette butts, recycled textile waste, and almond skins have been investigated by different authors.Finally, the last batch of papers included a review of sound insulation properties of innovative concretes and two research papers focussing on a numerical and experimental analysis of wood plastic composite (WPC) panels and on the potential of semi-active solutions employing compressible constrained layer damping (CCLD).

Technology: general issues --- perforated panel --- absorber array --- low frequency absorption --- sound absorber --- cigarette butts --- sustainable material --- recycling --- variability analysis --- textile waste --- biopolymers --- sound absorption --- sustainable materials --- circular economy --- polyurethane foam --- thermal property --- phase change material --- flame retardant --- perforated plates with extended tubes --- porous materials --- periodic absorber --- wood plastic composite --- transmission loss --- radiation efficiency --- orthotropic panel --- wavenumber analysis --- molecular sieve pellets --- impedance tube --- sound transmission loss --- semi-active damping --- sandwich panel --- morphing structure --- compressible constrained layer damping --- composite materials --- anisotropic materials --- optimized absorption --- diffuse field --- graded properties --- agro-waste --- hygrothermal performances --- concrete --- noise --- acoustic properties --- sound-absorbing --- sound-reflecting

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Wood-plastic composite (WPC) is a non-recyclable composite material lumber or timber made of recycled plastic and wood wastes which has become one of the most dynamic sectors of the plastics industry in this decade. It is used in numerous applications, such as, outdoor deck floors, railings, fences, landscaping timbers, park benches, window and door frames. This book starts with a brief glimpse at the basic structures and properties of WPCs. Aspects such as surface treatment, machinery used and testing types of WPCs are also covered. The following chapters of the book give a view of foam technology, flame retardant properties and colour retardant properties of WPCs. The way morphology affects or controls the physical and mechanical behaviours of the finished materials is discussed. Finally, the authors give an overview of the applications of wood-plastic composites in daily life. The book may serve as a source book for scientists wishing to work in this field.

Plastic -- Anatomy. --- Plastic-impregnated wood. --- Wood -- Anatomy. --- Wood-Plastic-Composite. --- Composite materials --- Plastic-impregnated wood --- Mechanical Engineering --- Chemical & Materials Engineering --- Engineering & Applied Sciences --- Industrial & Management Engineering --- Materials Science --- Composite materials. --- Wood, Plastic-impregnated --- Engineering. --- Industrial engineering. --- Structural materials. --- Materials science. --- Operating Procedures, Materials Treatment. --- Structural Materials. --- Ceramics, Glass, Composites, Natural Methods. --- Characterization and Evaluation of Materials. --- Wood --- Composites (Materials) --- Multiphase materials --- Reinforced solids --- Solids, Reinforced --- Two phase materials --- Materials --- Preservation --- Manufactures. --- Materials. --- Surfaces (Physics). --- Manufacturing, Machines, Tools, Processes. --- Ceramics, Glass, Composites, Natural Materials. --- Physics --- Surface chemistry --- Surfaces (Technology) --- Engineering --- Engineering materials --- Industrial materials --- Engineering design --- Manufacturing processes --- Manufactured goods --- Manufactured products --- Products --- Products, Manufactured --- Commercial products --- Manufacturing industries --- Ceramics. --- Glass. --- Composites (Materials). --- Material science --- Physical sciences --- Amorphous substances --- Ceramics --- Glazing --- Ceramic technology --- Industrial ceramics --- Keramics --- Building materials --- Chemistry, Technical --- Clay --- Architectural materials --- Architecture --- Building --- Building supplies --- Buildings --- Construction materials --- Structural materials

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This work covers all aspects related to the obtainment, production, design, and processing of biopolymers obtained from natural resources. Moreover, it studies characteristics related to the improvement of their performance to increase their potential application at an industrial level, in line with the concept of a global circular economy. Thus, this work firstly classifies biopolymers obtained from natural resources (e.g., biobased building blocks and biopolymers extracted directly from plants and biomass), and then summarizes several cutting-edge research works focused on enhancing the performance of biopolymers from natural resources to extend their application in the industrial sector, and contribute to the transition to more sustainable plastics.

Technology: general issues --- History of engineering & technology --- PHBH --- almond shell flour --- mechanical properties --- thermal characterization --- WPCs --- bacterial polyesters --- poly(3-hydroxybutyrate-co-3hydroxyhexanoate)—PHBH --- poly(ε-caprolactone)—PCL --- binary blends --- improved toughness --- mechanical and thermal characterization --- Cucumis metuliferus --- extraction --- antioxidant activity --- coating --- cellulose acetate --- LDPE --- bilayer packaging --- active packaging --- poly(lactic acid) --- mechanical recycling --- yerba mate --- bionanocomposites --- polysulfide-derived polymers --- cottonseed oil --- fatty acid of cottonseed oil --- sodium soap of cottonseed oil --- PLA --- nanocomposites --- functional properties --- thymol --- migration --- films --- cutin --- cuticles --- bioplastics --- biopolymers --- solanum: CPMAS 13C NMR --- softgels --- mucilage --- in vitro digestion --- bioaccessibility --- bran content --- plasticized wheat flour --- citric acid --- biobased blends --- biopolymer --- carboxymethyl cellulose --- solid polymer electrolyte --- ionic transport --- chitosan --- potato starch --- microwave --- foam --- orthogonal experiments --- empty fruit bunch --- regenerated cellulose --- ionic liquid --- methyl methacrylate --- 3D printing --- syringe extrusion 3D printing --- hydroxypropyl methylcellulose --- orodispersible film --- phenytoin --- PA610 --- halloysite nanotubes (HNTs) --- flame retardant --- cone calorimeter --- agricultural waste --- asparagus --- CMC --- degree of substitution --- DS --- cellulose extraction --- thermoplastic starch --- dolomite --- biocomposite --- sonication --- bacterial cellulose --- nata de coco --- sodium hydroxide --- lignin --- nanoparticles --- biorefinery --- organosolv pretreatment --- polyelectrolyte multi-layers --- sodium alginate --- k-carrageenan --- cellulosic nonwoven textile --- surface functionalization --- characterization --- bio-sorption --- isotherms --- natural fibers --- soy protein --- chitin --- coir --- comfort --- functional textiles --- Circular Bioeconomy --- carbonation reaction --- selectivity optimization --- carbonated epoxidized linseed oil --- non-isocyanate polyurethane --- argan shell particles --- wood plastic composite --- polyethylene --- compatibilization --- air permeability --- fungal fibers --- hemp fibers --- microstructure --- mycocel --- softwood fibers --- virus membrane filtration --- allotropic transition --- choline chloride --- plasticizer --- starch dissolution --- n/a --- poly(3-hydroxybutyrate-co-3hydroxyhexanoate)-PHBH --- poly(ε-caprolactone)-PCL