Dynamic mechanical analysis of Scots pine and three tropical hardwoods

Ashaduzzaman, Md.; Hale, Michael; Ormondroyd, Graham; Spear, Morwenna

doi:10.1080/20426445.2020.1799910

Cited by 9 publications

(11 citation statements)

References 52 publications

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“…The tan δ peaks in the higher temperature range are commonly identified as the β-peak, which is a secondary relaxation relating to segments of the polymer chain, and the α-peak or glass transition temperature. The β-peak typically occurs between −7 and +34 °C in wood containing low to moderate quantities of moisture [ 95 ], but has also been reported over a much wider temperature range (e.g., −53 to +53 °C [ 96 ]) and as high as 70 °C [ 59 ] or 83 °C [ 97 ], and up to 118 °C in oven-dried wood [ 98 ]. A separate β wet peak has been observed by some researchers [ 99 ].…”

Section: Resultsmentioning

confidence: 99%

“…There was a stronger peak at 93–114 °C for CE, 96–114 °C for COS and 91–111 °C for COH, which in some cases (but not all) was associated with a decrease in E′, which could be attributed to α-peak or glass transition. Where there was no substantial decrease in the E′ value, and the tan δ graph indicated an upturn at temperatures approaching 150 °C (the end of temperature scan range), it could be argued that this peak is a β-peak not an α-peak [ 97 ]. In the archaeological samples, the tan δ peaks were stronger than the contemporary wood samples, most notably the β-peaks at the higher temperature range.…”

Section: Resultsmentioning

confidence: 99%

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The Viscoelastic Behaviour of Waterlogged Archaeological Wood Treated with Methyltrimethoxysilane

et al. 2021

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Waterlogged wood treatment with methyltrimethoxysilane (MTMS) proved effective in stabilising wood dimensions upon drying (anti-shrink efficiency of 76–93%). Before the method can be proposed as a reliable conservation treatment, further research is required that includes the evaluation of the mechanical properties of treated wood. The aim of the study was to characterise the effect of the treatment on the viscoelastic behaviour of archaeological waterlogged elm and oak wood differing in the degree of degradation. Dynamic mechanical analysis in the temperature range from −150 to +150 °C was used for the study. To better understand the viscoelastic behaviour of the treated wood, pore structure and moisture properties were also investigated using Scanning Electron Microscopy, nitrogen sorption, and Dynamic Vapour Sorption. The results clearly show that methyltrimethoxysilane not only prevents collapse and distortions of the degraded cell walls and decreases wood hygroscopicity (by more than half for highly degraded wood), but also reinforces the mechanical strength by increasing stiffness and resistance to deformation for heavily degraded wood (with an increase in storage modulus). However, the MTMS also has a plasticising effect on treated wood, as observed in the increased value of loss modulus and introduction of a new tan δ peak). On the one hand, methyltrimethoxysilane reduces wood hygroscopicity that reflects in lower wood moisture content, thus limiting the plasticising effect of water on wood polymers, but on the other hand, as a polymer itself, it contributes to the viscous behaviour of the treated wood. Interestingly, the effect of silane differs with both the wood species and the degree of wood degradation.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

The Viscoelastic Behaviour of Waterlogged Archaeological Wood Treated with Methyltrimethoxysilane

et al. 2021

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“…Since the two maxima are not at the same temperature, it is necessary to state which one was used to determine the glass transition temperature. In case several maxima are present, the most intensive transition (at the highest temperature or the lowest frequency) is called alpha relaxation, the maximum at the second-highest temperature corresponds to beta relaxation, and so on (25,37). The alpha relaxation is usually ascribed to the glass transition, while the beta relaxation is related to the localized motion of small groups of atoms, e.g., a side group.…”

Section: Thermodilatometry Thermomechanical and Dynamic Mechanical An...mentioning

confidence: 99%

Application of thermal analysis methods in biology and medicine

Macan

2023

Period Biol

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Thermal analysis methods are widely used in the characterization of substances and materials in chemistry and engineering. But they also find their application in life sciences: biology and medicine. This paper exhaustively and critically reviews the application of the most commonly used thermal analysis methods for the characterization of organs and tissues of plants, animals, and humans. The methods are suitable for differentiating between several types of water in a cell, optimizing treatment, storage, or cultivation conditions, following plant or animal development, medical diagnostics and modelling, and more. Expertise developed in the characterization of synthetic materials and molecules can be transferred to that of biological tissues and biomolecules and opens a perspective for interdisciplinary research. Still, researchers should take into consideration the inherent complexity of biological samples, as well as inevitable changes when isolating the tissue from the living organism.

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“…The main use of DMA is to observe the effect of environmental changes (temperature and RH) on the measured parameters of tested materials (Menard 2006). The test parameters (span length, deflection, loading force, and loading frequency) are also factors influencing the results (Ashaduzzaman et al 2020). The size of DMA samples is defined by the type of loading and the associated span of clamps, the internal dimension of a heating or climatic chamber, and the type of device used (Peng et al 2008;Chowdhury et al 2010;Kaboorani and Blanchet 2014).…”

Section: Introductionmentioning

confidence: 99%

Dynamic Properties Of Wood Obtained By Frequency Resonance Technique And Dynamic Mechanical Analysis

Nop,

Cristini,

Zlamal

et al. 2023

WFS

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The study of the viscoelastic properties of wood involves the determination of dynamic parameters. Different methods can be used to determine these parameters, which bring the question of whether these parameters can be considered identical depending on the method used. This study compares the frequency resonance technique and dynamic mechanical analysis for determining the bending dynamic modulus of elasticity (MOED) and damping coefficient tan d of dry and green wood. Groups of specimens of European beech (Fagus sylvatica L.), small-leaved linden (Tilia cordata Mill.), European oak (Quercus robur L.), and Norway spruce (Picea abies L.) wood at three levels of MC were tested with both methods. The bending dynamic modulus of elasticity decreased with increasing MC until the FSP. There were no significant changes in dynamic modulus with increasing MC above FSP. A strong linear correlation between MOED obtained through both methods was found (r 5 0.92, r 2 5 0.84). For the damping coefficient tan d, the relationship was weaker (r 5 0.57, r 2 5 0.32), and each method showed a different influence of MC on the damping coefficient above the FSP, which leads to the conclusion that the damping coefficient is sensitive to the measurement method.

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Dynamic mechanical analysis of Scots pine and three tropical hardwoods

Cited by 9 publications

References 52 publications

The Viscoelastic Behaviour of Waterlogged Archaeological Wood Treated with Methyltrimethoxysilane

The Viscoelastic Behaviour of Waterlogged Archaeological Wood Treated with Methyltrimethoxysilane

Application of thermal analysis methods in biology and medicine

Dynamic Properties Of Wood Obtained By Frequency Resonance Technique And Dynamic Mechanical Analysis

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