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Special Issue "Advances in Wood Based Composites"

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A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Biomacromolecules, Biobased and Biodegradable Polymers".

Deadline for manuscript submissions: 31 January 2024 | Viewed by 4935

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Special Issue Editors

Dr. Lubos Kristak
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Guest Editor

Faculty of Wood Sciences and Technology, Technical University in Zvolen, T. G. Masaryka 24, SK-960 01 Zvolen, Slovakia
Interests: physics; materials; thermal properties; wood sciences; wood physics
Special Issues, Collections and Topics in MDPI journals

Prof. Dr. Roman Reh

E-Mail Website
Guest Editor

Faculty of Wood Sciences and Technology, Technical University in Zvolen, T. G. Masaryka 24, SK-960 01 Zvolen, Slovakia
Interests: wood-based composites; wood adhesives; wood sciences; wood physics
Special Issues, Collections and Topics in MDPI journals

Prof. Dr. Marius Cătălin Barbu *
E-Mail Website
Guest Editor

1. Forest Products Technology and Timber Construction Department, Salzburg University of Applied Sciences, Markt 136 a, 5431 Kuchl, Austria
2. Faculty of Furniture Design and Wood Engineering, Transylvania University of Brasov, B-dul. Eroilor nr. 29, 500036 Brasov, Romania
Interests: wood- and non-wood composites; wood processing and technology
* Prof.Dr.Habil.Dr.

Prof. Dr. Eugenia Mariana Tudor

*
E-Mail Website
Guest Editor

1. Forest Products Technology and Timber Construction Department, Salzburg University of Applied Sciences, Markt 136 a, 5431 Kuchl, Austria
2. Faculty of Furniture Design and Wood Engineering, Transylvania University of Brasov, B-dul. Eroilor nr. 29, 500036 Brasov, Romania
Interests: ligno-cellulosic composites; material science; ecology of materials; scientific writing
* FH-Prof.

Special Issue Information

Dear Colleagues,

Wood-based composite's importance has dramatically increased in recent years. They are derived by combining eligible wood elements with thermoplastic adhesives. Some additives, such as hardeners or fillers are purposefully added to produce better and faster wood-based composites. These additives help provide physical and mechanical properties to the polymer matrix. Wood-based composites find their application in a number of structural and non-structural applications for interior and exterior purposes, such as furniture, construction, floorings, doors, and other applications.

This Special Issue is focused on high-quality original research articles and reviews on topics including (but not limited to) the latest approaches in the development of wood-based composites, including
reinforced composite structures, novel eco-friendly wood-based composites, wood-plastic composites (WPC), advanced functionalities in laminates, activation of natural fibers, natural matrix, and other industrial manufacturing research advancements in wood composite materials and their application.

Dr. Ľuboš Krišťák
Prof. Dr. Réh Roman
Prof.Dr.Habil.Dr. Marius Cătălin Barbu
FH-Prof. Eugenia Mariana Tudor
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Polymers is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

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Research

Open AccessArticle

Effect of Silane Coupling Agent Modification on Properties of Brass Powder-Water-Based Acrylic Coating on Tilia europaea

Yan Han

and

Xiaoxing Yan

Polymers 2023, 15(6), 1396; https://doi.org/10.3390/polym15061396 - 10 Mar 2023

Cited by 1 | Viewed by 1001

Abstract

Fine art coating is usually created by the combination of metal filler and water-based coatings, decorated to the surface of wood structures, furniture, and crafts. However, the durability of the fine art coating is limited by its weak mechanical qualities. In contrast, the metal filler’s dispersion and the coating’s mechanical properties can be significantly improved by the coupling agent molecule’s ability to bind the resin matrix with the metal filler. In this study, a brass powder-water-based acrylic coating was prepared, and three different silane coupling agents, 3-aminopropyltriethoxysilane (KH550), γ-(2,3-epoxypropoxy)propytrimethoxysilane (KH560), and γ-methacryloxypropyltrimethoxysilane (KH570), were used to modify the brass powder filler in orthogonal tests. The artistic effect and optical properties of the modified art coating induced by different proportions of brass powder, silane coupling agents, and pH were compared. The result demonstrated that the amount of brass powder and the kind of coupling agent used had a substantial impact on the coating’s optical characteristics. Our results also determined how three different coupling agents affected the water-based coating with varying brass powder contents. The findings indicated that 6% KH570 concentration and pH 5.0 were the ideal conditions for brass powder modification. Better overall performance of the art coating applied to the surface of the Basswood substrates was provided by adding 10% of the modified brass powder into the finish. It had a gloss of 20.0 GU, a color difference of 3.12, a color main wavelength of 590 nm, a hardness of HB, an impact resistance of 4 kg·cm, an adhesion of grade 1, and better liquid resistance and aging resistance. This technical foundation for the creation of wood art coatings promotes the application of art coatings on wood. Full article

(This article belongs to the Special Issue Advances in Wood Based Composites)

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Open AccessArticle

Evaluation of Selected Cellulose Macromolecular Properties after Its Chemical Treatment Using Size Exclusion Chromatography

and

Polymers 2023, 15(3), 573; https://doi.org/10.3390/polym15030573 - 22 Jan 2023

Viewed by 842

Abstract

This work evaluates the effect of using selected inorganic chemicals as the main components of waterborne wood preservative systems on the degradation of the cellulose constituent in wood from model samples. The polymeric properties of cellulose and the homogeneity of the degradation process primarily reflect very well the degree of cellulose deterioration. Whatman papers, as pure cellulose model samples, were impregnated with 10 different 5 wt% solutions of inorganic salts and distilled water and consequently subjected to wet-thermal accelerated aging (T = 85 °C, RH = 65%, for 30 days). The samples were then derivatized to cellulose tricarbanilates (CTCs) through two different procedures (by precipitation in a methanol–water mixture/by evaporation of pyridine from the reaction mixture) and finally analyzed using size exclusion chromatography (SEC). Chemically treated and aged cellulose samples showed different changes in the degree of polymerization (DP) and polydispersity (PD) in terms of untreated non-aged standard caused by different ongoing degradation reactions, such as dehydration, hydrolysis, oxidation, and crosslinking. In general, the lowest degradation rate after treatment by chemicals and after accelerated aging was observed in samples treated by borates, NaCl, and ZnSO₄·7H₂O. The greatest depolymerization after treatment and after accelerated aging was caused by sulphates containing NH⁴⁺, Cu²⁺, and Fe³⁺ cations, with aging by NH₄Cl and (NH₄)₂HPO₄-treated samples also leading to significant depolymerization. The higher DP values are linked to the precipitated method of CTC preparation, though not for chlorides and phosphates. PD is also generally higher in precipitated and aged samples and is heavily influenced by the presence of low molecular weight products. This paper brings new insights regarding the complex evaluation of the polymeric properties of degraded cellulose by considering all important factors affecting the sample and the analysis itself through the use of statistics. From the statistical point of view, the influences of all factors (solution, aging, method) and their interactions (except aging*method) on DP are statistically significant. The influence of the sample processing method used for analysis of the desired results becomes important mainly in practice. This work recommends the evaporation method for more accurate description of more degraded cellulose. Full article

(This article belongs to the Special Issue Advances in Wood Based Composites)

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Open AccessArticle

Physical Properties of Fast-Growing Wood-Polymer Nano Composite Synthesized through TiO₂ Nanoparticle Impregnation

and

Polymers 2022, 14(20), 4463; https://doi.org/10.3390/polym14204463 - 21 Oct 2022

Cited by 3 | Viewed by 1378

Abstract

Mangium (Acacia mangium Willd.) is a fast-growing wood that is widely grown in Indonesia. The impregnation method is needed to improve the qualities of the wood. In this study, TiO₂ nanoparticle (79.17 nm) was produced using the hydrothermal method. The purpose of this study was to analyze the effect of TiO₂ nanoparticle impregnation on the density and dimensional stability of mangium and the effectiveness of the presence of TiO₂ nanoparticle in wood in degrading pollutants. The mangium samples (2 cm × 2 cm × 2 cm) were placed inside impregnation tube. The impregnation solutions included water (untreated), 1% TiO₂ nanoparticle, and 5% TiO₂ nanoparticles. The samples were analyzed for density, weight percent gain (WPG) dan bulking effect (BE). Samples were also analyzed by X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR). TiO₂ nanoparticle resulted in an increase in density, WPG, and BE-treated mangium. Based on XRD and FTIR results, TiO₂ nanoparticle was successfully impregnated into mangium wood. Scanning electron microscopy–energy-dispersive X-ray spectroscopy analysis indicated that TiO₂ nanoparticle covered the surface of the wood cells. The TiO₂-impregnated mangium wood has a higher photocatalyst activity than untreated, indicating better protection from UV radiation and pollutants. Full article

(This article belongs to the Special Issue Advances in Wood Based Composites)

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Open AccessArticle

Selected Properties of Bio-Based Layered Hybrid Composites with Biopolymer Blends for Structural Applications

and

Polymers 2022, 14(20), 4393; https://doi.org/10.3390/polym14204393 - 18 Oct 2022

Cited by 2 | Viewed by 1053

Abstract

In this study, layered composites were produced with different biopolymer adhesive layers, including biopolymer polylactic acid (PLA), polycaprolactone (PCL), and biopolymer blends of PLA + polyhydroxybutyrate (PHB) (75:25 w/w ratio) with the addition of 25, 50% microcrystalline cellulose (MCC) and 3% triethyl Citrate (TEC) for these blends, which acted as binders and co-created the five layers in the elaborated composites. Modulus of rupture (MOR), modulus of elasticity (MOE), internal bonding strength (IB), density profile, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM) analysis were obtained. The results showed that among the composites in which two pure biopolymers were used, PLA obtained the best results, while among the produced blends, PLA + PHB, PLA + PHB + 25MCC, and PLA + PHB + 25MCC + 3TEC performed best. The mechanical properties of the composites decreased with increases in the MCC content in blends. Therefore, adding 3% TEC improved the properties of composites made of PLA + PHB + MCC blends. Full article

(This article belongs to the Special Issue Advances in Wood Based Composites)

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