Surface properties of thermally treated composite wood panels

Croitoru, Cătălin; Spirchez, Cosmin; Lunguleasa, Aurel; Cristea, Daniel; Roată, Ionuţ Claudiu; Pop, Mihai Alin; Bedő, Tibor; Stanciu, Elena Manuela; Pascu, Alexandru

doi:10.1016/j.apsusc.2017.08.193

Cited by 40 publications

(23 citation statements)

References 48 publications

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“…The differences between PLA/PHA/BambooFill and neat PLA also reside in the slightly lower thermal degradation temperature onset of the former compared to the latter (due to more degradation‐susceptible components of wood , possibly ascribed to the onset of hemicellulose degradation …”

Section: Resultsmentioning

confidence: 99%

Structural changes during 3D printing of bioderived and synthetic thermoplastic materials

Pop

Croitoru

Bedő

et al. 2018

J of Applied Polymer Sci

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Three‐dimensional (3D) printing processes are nowadays leading the charge in transforming traditional art, engineering, and manufacturing processes. In this study, the structural and thermal behavior of commercially available filaments composed of synthetic poly(acrylonitrile‐co‐butadiene‐co‐styrene) thermoplastic as well as poly(lactic acid) and poly(lactic acid)/polyhydroxyalcanoate reinforced with bamboo (Bambusa sp.) wood flour composite biothermoplastics were assessed by differential scanning calorimetry and infrared spectroscopy, aiming to understand the modifications that occur at the molecular level during their 3D printing. It has been determined that the biothermoplastic materials undergo both molecular reorientations related to tacticity increase and crystallinity decrease when submitted to 3D printing extrusion, while the synthetic thermoplastic undergoes crosslinking due to its butadiene component. All of the studied materials present good water stability (with water uptake values between 0.8% and 24%), and the water absorption follows a pseudo‐Fickian mechanism. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019.

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Section: Resultsmentioning

confidence: 99%

Structural changes during 3D printing of bioderived and synthetic thermoplastic materials

Pop

Croitoru

Bedő

et al. 2018

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

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“…The specimen was supported on the disk with a horizontal rotation speed of 50 ± 2 rpm. The abrasion performances of the four kinds of wood were compared under different revolutions [36]:…”

Section: Nanoindentationmentioning

confidence: 99%

Properties of common tropical hardwoods for fretboard of string instruments

et al. 2020

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Fretboards of string instruments are usually made of rare woods that commonly have a high density, strength, and hardness; further, they are wear resistant, uniform in texture, and feature an elegant color. To reduce the consumption of scarce timber resources, especially of endangered tropical hardwood species, suitable replacement materials should be identified. The substitute can be either common tree species having similar characteristics, or fast-growing plantation wood that has undergone modifications to match the performance of precious woods. This study compares the anatomical structure, physical features, mechanical properties, and surface color of three precious woods traditionally used in fretboards (ebony, Indian rosewood, and African blackwood) against maple, which is used for the backboard, ribs, and necks of string instruments. Based on the data, a set of performance evaluation indices for selecting alternative materials for fretboards is proposed. In specific, the replacement wood should be a diffuse-porous tropical hardwood with few vessels and a smaller diameter, thick fibrous walls, and a cell wall rate of more than 50%. In terms of physical properties, it should have low swelling coefficients for moisture and water absorption, and dimensional stability. The replacement should also display hardness values greater than 9.0 kN in the cross-section and greater than 6.0 kN in the tangential and radial sections. Further, it should have a high modulus of rupture (> 149 MPa) and elasticity (> 14.08 GPa), good impact bending strength, and good wear resistance (80-150 mg/100 r). To satisfy the traditional aesthetics, the wood surface color should be black, dark brown, or dark purple-brown, with colorimetric parameters in the range of 0.0 < L* < 30.0, 0.0 < b* < 6.0, and an a* value as small as possible. The evaluation indicators used for searching potential high-quality alternative tree species are not the same as those for replacing traditional fretboard materials using modified fast-growing plantation wood. The physical and mechanical properties and the surface color of traditional precious fretboard wood are important evaluation indicators for whether the modified fast-growing plantation wood can replace the traditional fretboard wood.

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“…This treatment increases the compactness of the wood structure both in the panel cross-section as well as on the surface due to the macromolecular rearrangement and water loss. This compactness provides the effective stabilization of the wood assembly under water aging circumstances [89]. Fewer hydrophilic fibers can be produced by a retting process where a high amount of waxes can be deposited on the fiber's surface.…”

Section: Physical Treatmentsmentioning

confidence: 99%

Critical Review of the Parameters Affecting the Effectiveness of Moisture Absorption Treatments Used for Natural Composites

2019

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Natural composites can be fabricated through reinforcing either synthetic or bio-based polymers with hydrophilic natural fibers. Ultimate moisture absorption resistance at the fiber–matrix interface can be achieved when hydrophilic natural fibers are used to reinforce biopolymers due to the high degree of compatibility between them. However, the cost of biopolymers is several times higher than that of their synthetic counterparts, which hinders their dissemination in various industries. In order to produce economically feasible natural composites, synthetic resins are frequently reinforced with hydrophilic fibers, which increases the incompatibility issues such as the creation of voids and delamination at fiber–matrix interfaces. Therefore, applying chemical and/or physical treatments to eliminate the aforementioned drawbacks is of primary importance. However, it is demonstrated through this review study that these treatments do not guarantee a sufficient improvement of the moisture absorption properties of natural composites, and the moisture treatments should be applied under the consideration of the following parameters: (i) type of hosting matrix; (ii) type of natural fiber; (iii) loading of natural fiber; (iv) the hybridization of natural fibers with mineral/synthetic counterparts; (v) implantation of nanofillers. Complete discussion about each of these parameters is developed through this study.

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Surface properties of thermally treated composite wood panels

Cited by 40 publications

References 48 publications

Structural changes during 3D printing of bioderived and synthetic thermoplastic materials

Structural changes during 3D printing of bioderived and synthetic thermoplastic materials

Properties of common tropical hardwoods for fretboard of string instruments

Critical Review of the Parameters Affecting the Effectiveness of Moisture Absorption Treatments Used for Natural Composites

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