Reducing the moisture sensitivity of linear friction welded birch (<i>Betula pendula</i>L.) wood through thermal modification

Ruponen, Jussi; Čermák, Petr; Rhême, Martin; Rautkari, Lauri

doi:10.1080/01694243.2015.1069721

Cited by 9 publications

(5 citation statements)

References 29 publications

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“…The density of the investigated samples is shown in Table 2. The density of untreated birch wood was 598 ± 42 kg/m 3 and coincided with the previously observed density of 568 kg/m 3 (Ruponen et al 2015). Using one-factor ANOVA analysis, F = 5.38 > Fcrit.…”

Section: Densitysupporting

confidence: 88%

Properties of modified wood according to treatment technology and thermo-vacuum process for birch (Betula pendula Roth) veneers

Meija-Feldmane

Cuccui²,

Irbe

et al. 2020

BioRes

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Thermally modified birch (Betula pendula Roth) veneers that had been subjected to wood treatment technology (WTT) or thermo vacuum (TV) processes were compared in this study. After modification of veneers in the range of temperatures from 160 °C to 218 °C and times from 0.5 h to 3 h, the color, mass loss, density, tensile strength, hygroscopicity, and decay resistance against brown rot fungus Coniophora puteana were determined. Treatment regimes with the greatest mass loss were at 217 °C for 3.0 h in TV (7.8%) and 160 °C for 0.8 h in the WTT (6.7%). As expected, wood mass loss correlated well with moisture exclusion efficiency (MEE) in all relative humidity (RH) environments (r = 0.95 to 0.99). Strength loss in the WTT was considerable compared to the TV process (57% and 40%, respectively). The resistance against brown rot fungus was moderate with a mass loss of 12% to 33%. Among the investigated samples, the regime 217/3.0/TV showed the best resistance against brown rot fungus and acceptable other properties.

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Section: Densitysupporting

confidence: 88%

Properties of modified wood according to treatment technology and thermo-vacuum process for birch (Betula pendula Roth) veneers

Meija-Feldmane

Cuccui²,

Irbe

et al. 2020

BioRes

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“…According to this approach, heat treatment is used as both an effective and environmentally friendly way to improve the hygroscopic nature and biological durability of wood because it increases its dimensional stability by reducing water absorption [28,[56][57][58]. Nevertheless, the high temperatures involved cause a reduction in the mechanical properties of the wood.…”

Section: Optimization By Thermal Modification and Chemical Treatments...mentioning

confidence: 99%

A Review of the Advances Made in Improving the Durability of Welded Wood against Water in Light of the Results of African Tropical Woods Welding

Biwôlé¹,

Biwolé²,

Pizzi³

et al. 2023

Journal of Renewable Materials

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Wood plays a major role in the production of furniture and wooden structures. Nevertheless, in this process, the massive use of adhesives and plural connectors remains a definite problem for health and the environment. Therefore, wood welding is a breakthrough in this respect. This paper reviews the applications of wood welding in furniture and construction and then examines advances in improving the durability of welded wood against water. Our contribution also highlights the need to join African tropical woods using the rotational friction welding technique. According to our results, these woods present interesting chemical singularities, which could provide solutions to the water vulnerability of the welded wood. Moreover, the use of such a joining method would first free the Cameroonian furniture industry from the chemical industry, secondly position it at the forefront of new eco-design trends and thirdly make it competitive with other countries in the Central African sub-region. These works enrich the long and rich bibliography on the technique of wood welding, which has long been conspicuous by its absence of tropical woods.

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“…которое принципиально выражает условие поддержания постоянства соотношения сомономеров в реакционной массе (x = const) путем введения определенного количества первого более активного мономера М 1 в реактор. Данный технологический прием способствует образованию макромолекулы сополимера с более стабильным составом и структурой (структуру по составу) [11].…”

Section: результаты и обсуждениеunclassified

“…Уравнение(10) преобразуем к виду(11), которое удобно обрабатывать методом наименьших квадратов[14] для нахождения требуемых коэффициентов:y = a 0k эф  t. (11)Для интересующих бинарных реакционных смесей мономеров можно использовать справочную информацию о величинах констант скорости или получать их экспериментальным путем. Для новых бинарных систем всю необходимую исходную информацию можно получить при экспериментальном изучении кинетики сополимеризации.…”

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A model for producing polymer stabilizers of composites with a given macromolecule composition

Glazkov

Глазков

Kozlov

et al. 2020

Vestn. Voronež. gos. univ. inž. tehnol.

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An attempt has been made to obtain a working technological formula that regulates the addition of comonomer over time, which ensures the synthesis of a copolymer macromolecule with a constant composition and, accordingly, with predicted properties of both the copolymer and its modified porous composite materials. Mathematical modeling is based on the theory of the kinetics of copolymerization, which takes into account the reactivity of monomers by means of copolymerization constants of reacting comonomers. The starting base was the kinetics of the copolymerization of two comonomers, significantly differing in their reactivity, which required a sequential, stepwise supply of a less reactive monomer to the reaction medium with a more active monomer. This technological technique contributes to maintaining the constancy of the initial ratio of comonomers and, accordingly, the synthesis of a copolymer with a constant composition, structure and properties. The dependence of the sequence of supply of comonomer to the reaction medium required the introduction of a generalized effective binary copolymerization rate coefficient. To find the generalized coefficient of the copolymerization rate, the operation of logarithm was performed and the current expression of the dependence of the concentration change of the more active monomer in time in a linear form was translated. This mathematical technique made it possible to use software to process reference information to obtain the necessary coefficients for the working formula. As a result of mathematical modeling using the basic principles of binary copolymerization, the law of effective masses, and the least squares method, a working formula is obtained that allows one to regulate the given introduction of a less active monomer into the reaction medium in time. The model is analyzed using background information, the basic concepts of binary copolymerization and can be used in technological calculations when producing copolymers with specified characteristics in composition and structure.

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Reducing the moisture sensitivity of linear friction welded birch (Betula pendulaL.) wood through thermal modification

Cited by 9 publications

References 29 publications

Properties of modified wood according to treatment technology and thermo-vacuum process for birch (Betula pendula Roth) veneers

Properties of modified wood according to treatment technology and thermo-vacuum process for birch (Betula pendula Roth) veneers

A Review of the Advances Made in Improving the Durability of Welded Wood against Water in Light of the Results of African Tropical Woods Welding

A model for producing polymer stabilizers of composites with a given macromolecule composition

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