Oak particles size effects on viscous-elastic properties of wood polyester resin composite submitted to ultraviolet radiation

Stanciu, Mariana Domnica; Bucur, Voïchita; Vâlcea, Cristina Silvia; Savin, Adriana; Šturm, Roman

doi:10.1007/s00226-017-0971-0

Cited by 7 publications

(8 citation statements)

References 26 publications

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“…The tests to determine the flow and relaxation phenomena provide important information about the dimensional stability of the polymer [ 12 , 13 ]. Some studies have shown that the natural fibres used for reinforcement are thermally unstable above 200 °C, for which reason the used matrices are based on polyethylene (PE), PP, polyolefin, polyvinylchloride and polystyrene and thermosets (which can be cured below this temperature) [ 11 , 12 , 13 , 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

“…Most studies on wood reinforced composites (plastic wood composites) have analysed either the influence of the particle volume fraction/resin, or the influence of the size of wood particles, or the influence of the fibre type used as reinforcing elements on the mechanical properties of composites [ 14 , 15 ]. Mechanical properties of wood plastic composites (WPC), determined by tensile and bending tests, show an increase of the elasticity modulus E and yield modulus at the same time with the increasing of the particle size between 0.1 mm and 0.2 mm.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical and Rheological Behaviour of Composites Reinforced with Natural Fibres

Stanciu

Drăghicescu²,

Tamas³

et al. 2020

Polymers

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The paper deals with the mechanical behaviour of natural fibre composites subjected to tensile test and dynamic mechanical analysis (DMA). Three types of natural fibre composites were prepared and tested: wood particle reinforced composites with six different sizes of grains (WPC); hemp mat reinforced composites (HMP) and flax reinforced composite with mixed wood particles (FWPC). The tensile test performed on universal testing machine LS100 Lloyd’s Instrument highlights the elastic properties of the samples, as longitudinal elasticity modulus; tensile rupture; strain at break; and stiffness. The large dispersion of stress–strain curves was noticed in the case of HMP and FWPC by comparison to WPC samples which present high homogeneity of elastic–plastic behaviour. The DMA test emphasized the rheological behaviour of natural fibre composites in terms of energy dissipation of a material under cyclic load. Cole–Cole plots revealed the connection between stored and loss heat energy for studied samples. The mixture of wood particles with a polyester matrix leads to relative homogeneity of composite in comparison with FWPC and HMP samples which is visible from the shape of Cole–Cole curves. The random fibres from the hemp mat structure lead to a heterogeneous nature of composite structure. The elastic and viscous responses of samples depend on the interface between fibres and matrix.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical and Rheological Behaviour of Composites Reinforced with Natural Fibres

Stanciu

Drăghicescu²,

Tamas³

et al. 2020

Polymers

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“…This can be explained due to the artificial weathering accelerates the cross-linking process of the polyester resin, the very small wood particles being included in polymer chains, the composite having a quasi-homogeneous structure. The larger the particles, the more the deformation energy is dissipated in the matrix and in the reinforcing elements, each of them overtaking a different deformation energy, depending on the viscous-elastic characteristics of the wood particles and of the polyester resin [6] and [10]. Before the accelerated weathering, in the structure of the lignocelluloses composite there are phenomena specific to wood particles, matrix and interface between matrix and wood particles, which leads to variations of the internal frictions due to the physical connections (of the Van der Waals type) and chemical one situated in various stages of polymerization [14] and [15].…”

Section: Discussionmentioning

confidence: 99%

“…The use of lignocelluloses composite with polymer matrix in the environment with UV radiation can cause photodegradation which lead to a weakening of the material and micro-cracking of the matrix [4] and [5]. Photodegradation is the main effect of UV environmental radiation on polymeric materials, which is shown by the following phenomena: breaking chemical bonds between the polymer chains, which leads to the formation of free radicals by dissociating C-H bonds from the polymer chains and to the oxidation of its surface because of peroxide radicals [6]. In addition, exposure to UV radiation can make the material more sensitive to the action of other factors (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical and Surface Properties of Lignocellulosic Fibres Reinforced Composites

Stanciu¹,

Savin²,

Năstac³

2018

SV-JME

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The aim of this paper is to evaluate the mechanical and surface properties of lignosellulosic fibres reinforced composite before and after photo-degradation exposure. This leads to decrease the mechanical properties of composite as modification of hydrophobic behavior of matrix. In the study, the lignocelluloses specimens were obtained by mix polyester resin type 440-M888 POLYLITE, in a volume percentage of 25 %, with different wood particles classified by size classes. The samples were exposed to UV-A radiations with a wavelength λ of 365 nm for 168 hours (7 days). The evaluation of the surface energy was carried out by the θ contact angle method. For mechanical properties, the dynamic mechanical analysis (DMA) was used to determine the variation of storage and loss modulus. The results showed that UV radiation induced structural morphological instability, which leads to hydrophilic effect. The loss modulus recorded an increasing with increases of wood particles sizes.

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Modification of Fibers and Matrices in Natural Fiber Reinforced Polymer Composites: A Comprehensive Review

ArunRamnath

Kushvaha

et al. 2022

Macromol. Rapid Commun.

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Application of natural fiber-polymer composites (NFPCs) in different industrial applications provides competitive edge due to their lightweight, higher specific mechanical properties than glass fibers, sustainability, and lower cost involved in production. There are certain challenges associated with natural fibers and their reinforcement in composites such as poor bonding between the fibers and matrix due to their contradictory nature of characteristics, moisture absorption, lower thermal properties, and poor interfacial adhesion between the natural fiber and polymer matrix. The challenges involved in NFPCs need to be overcome to produce materials with relatively equivalent properties to those of conventional composites and other metallic structures. Several researchers around the globe have conducted investigations with the primary attention being paid to the modification of natural fibers and matrix by employing surface treatments and other chemical treatment methods. In order to address the need for eco-friendly and sustainable materials in different domains, a comprehensive review on natural fibers and their sources, available matrix materials, modification techniques, mechanical and thermal properties of NFPCs, is needed for better understanding of the behavior of NFPCs. This work provides the information and holistic view of natural fiber-reinforced composites based on the results obtained from modification techniques, with the view of focusing the review in terms of different chemical and physical treatment techniques, modification of fibers and matrix, and enhanced mechanical and thermal properties in the composites.

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Oak particles size effects on viscous-elastic properties of wood polyester resin composite submitted to ultraviolet radiation

Cited by 7 publications

References 26 publications

Mechanical and Rheological Behaviour of Composites Reinforced with Natural Fibres

Mechanical and Rheological Behaviour of Composites Reinforced with Natural Fibres

Mechanical and Surface Properties of Lignocellulosic Fibres Reinforced Composites

Modification of Fibers and Matrices in Natural Fiber Reinforced Polymer Composites: A Comprehensive Review

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