Holzforschung最新文献_第7页

Upgrading the durability of perishable wood species using extractives from side streams of durable wood sawmill operations: a review 使用从耐用木材锯木厂操作的侧流中提取的提取物来提高易腐木材品种的耐久性:综述

3区农林科学

Holzforschung Pub Date : 2023-09-12 DOI: 10.1515/hf-2023-0049

Alberto António Manhiça, Ernesto Uetimane Júnior, Mohamed Jebrane, Peter R. Gillah

{"title":"Upgrading the durability of perishable wood species using extractives from side streams of durable wood sawmill operations: a review","authors":"Alberto António Manhiça, Ernesto Uetimane Júnior, Mohamed Jebrane, Peter R. Gillah","doi":"10.1515/hf-2023-0049","DOIUrl":"https://doi.org/10.1515/hf-2023-0049","url":null,"abstract":"Abstract Natural durability is one of the most rated features in wood end-use applications. In fact, several precious native tropical wood species produce timber of high natural durability, which is also related to long service life even for the highest hazard classes. However, selective logging is driving the existing volume of this group of species to near extinction. The remainder of the alternative species produces perishable timbers, which require synthetic chemical protection to prolong their service life but with detrimental effects on humans and the environment. Therefore, transferable durability has emerged as an alternative to gradually substitute traditional wood preservatives. From this approach, extractives from naturally durable wood species are removed and transferred to the non-durable wood species as an alternative environmental-friendly option for wood protection. Indeed, extractives from durable wood species have proven to have a deterrent effect on fungi, bacteria and termites and could be used to protect perishable wood species. Thus, this review aims to assess the prospects of developing environmentally friendly wood preservatives based on extractives sourced from highly natural, durable wood species to treat and add value to the group of perishable timbers. A step-wise analysis offers insights and challenges on (i) potential sources of extractives; (ii) effective extraction methods; (iii) extractive-based preservative formulation; and (iv) effective treatment methods for better preservative fixation for better wood protection. Accounts about the way forward for the development of extractive-based wood preservatives are also presented.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135879250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Processing of Pinus sylvestris L. into a heat-insulating, thermally stable, and flame-retarded material by combining the flame-retardant impregnation and densification treatment 采用阻燃浸渍和致密化处理相结合的方法将樟子松加工成隔热、热稳定、阻燃材料

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-09-08 DOI: 10.1515/hf-2023-0044

Zhisheng Xu, Wenjun Zhao, Long Yan, Xinyu Tang, Yuwei Feng, Zhengyang Wang

{"title":"Processing of Pinus sylvestris L. into a heat-insulating, thermally stable, and flame-retarded material by combining the flame-retardant impregnation and densification treatment","authors":"Zhisheng Xu, Wenjun Zhao, Long Yan, Xinyu Tang, Yuwei Feng, Zhengyang Wang","doi":"10.1515/hf-2023-0044","DOIUrl":"https://doi.org/10.1515/hf-2023-0044","url":null,"abstract":"Abstract Flame-retardant impregnation and densification are two major modification techniques to improve the fire safety of wood. Here, these two techniques were combined to prepare flame-retarded wood, aiming at further fire hazard reduction. The delignated Pinus sylvestris L. was impregnated with boric acid (BA) and graphene oxide (GO) solutions, then densified to prepare densified flame-retarded wood named BGO-DW sample. The results revealed that the BGO-DW sample obtained a limiting oxygen index (LOI) value of 47.4 %. Its backside temperature after 1200 s heating was 49 % lower than that of unmodified wood. Besides, the peak heat release rate (PHRR) and total heat release (THR) values of BGO-DW sample were 72 and 62 % lower than those of unmodified wood due to its shorter pyrolysis interval and lower peak mass loss rate (PMLR), as supported by thermogravimetric (TG) analysis. The flame retardancy of BGO-DW sample could be attributed to the formation of compatible char containing C=C aromatic structure, C–O–C cross-linked structure, and boron trioxide (B2O3) structure. These features of BGO-DW sample offer a new method to improve thermal stability, heat insulation, and flame retardancy for wood and wood-based products.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45938421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Predicting the air-dry density of black walnut based on NIR analysis 基于近红外分析的黑核桃干密度预测

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-09-07 DOI: 10.1515/hf-2023-0036

Zi-Rui Ren, Li Luo, Bin Na

引用次数: 0

A new look at the kinetics of oxygen delignification of softwood kraft pulp 软木硫酸盐浆氧脱木素动力学新探

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-09-06 DOI: 10.1515/hf-2023-0045

Azadeh Pahlevanzadeh, A. V. van Heiningen

{"title":"A new look at the kinetics of oxygen delignification of softwood kraft pulp","authors":"Azadeh Pahlevanzadeh, A. V. van Heiningen","doi":"10.1515/hf-2023-0045","DOIUrl":"https://doi.org/10.1515/hf-2023-0045","url":null,"abstract":"Abstract Using a Berty-type CSTR reactor, Ji (2007. Kinetics and mechanism of oxygen delignification, Ph.D. thesis. The University of Maine) obtained oxygen delignification kinetics first order in lignin when neglecting the higher initial delignification phase. In the present study the same Berty/CSTR reactor with an improved temperature control was used to determine the oxygen delignification kinetics of Southern Pine kraft pulp, with the kinetics now corrected for lignin removed by oxygen-free alkaline leaching. This removes the initial high delignification rate peak so that the kinetics over the entire lignin range can be modelled as first order in “reactive” lignin, which is lignin corrected for a small amount of unreactive lignin. It suggests that softwood pulp oxygen delignification consists of two contributions; phenolic delignification and alkaline leaching. The initial alkaline leaching phase is mathematically described by semi-infinite alkaline diffusion of dissolved lignin trapped in the cell wall after pulp washing. For phenolic delignification, the reaction orders in alkali concentration and oxygen of the power law delignification equation are 0.3 and 0.44 respectively, while the activation energy is 63 kJ/mol. Taking into account the unreactive HexA, the small amount of unreactive lignin, and the lignin removed by alkaline leaching, the kappa number is well predicted by the new delignification kinetics.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44939275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Frontmatter 头版头条

3区农林科学

Holzforschung Pub Date : 2023-09-01 DOI: 10.1515/hf-2023-frontmatter9

引用次数: 0

Swelling of lignin-based gel in salt-containing organic solvents and its application as gel electrolyte 木质素基凝胶在含盐有机溶剂中的溶胀及其作为凝胶电解质的应用

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-08-31 DOI: 10.1515/hf-2023-0067

F. Honda, Shogo Taira, Shiori Suzuki, K. Shikinaka, Kengo Shigetomi, Y. Uraki

{"title":"Swelling of lignin-based gel in salt-containing organic solvents and its application as gel electrolyte","authors":"F. Honda, Shogo Taira, Shiori Suzuki, K. Shikinaka, Kengo Shigetomi, Y. Uraki","doi":"10.1515/hf-2023-0067","DOIUrl":"https://doi.org/10.1515/hf-2023-0067","url":null,"abstract":"Abstract A lignin-based gel prepared by the chemical crosslinking of hardwood acetic acid lignin (AL) with poly(ethylene glycol) diglycidyl ether has been reported to shrink in water and organic solvents but swell specifically in aqueous binary solutions. In this study, the AL-based gel was also found to swell in lithium-salt-containing organic solvents, namely, liquid electrolytes. The uptake of salt solutions reached five times the dry weight of the gel. The ionic conductivity of the gel swollen with 1 M LiBF4 in propylene carbonate or a mixed solution (1:1, v/v) of ethylene carbonate and dimethyl carbonate exceeded 1 mS cm−1 at room temperature (25 °C), suggesting that this gel can be applied as a gel electrolyte for lithium-ion batteries (LIBs). A prototype LIB was assembled with the AL-based gel electrolyte and LiCoO2/graphite-based electrodes and exhibited low bulk and charge transfer resistances of 4.1 and 9.7 Ω, respectively. Moreover, its initial specific capacity reached 104 mAh g−1 at a current density of 28 mA g−1, which is comparable to that of a reference LIB assembled using a commercial polyethylene separator. These results indicate the significant potential of this lignin-based gel for application in energy storage devices.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"0 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41517392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microscopic computed tomography aided finite element modelling as a methodology to estimate hygroexpansion coefficients of wood: a case study on opposite and compression wood in softwood branches 微观计算机断层扫描辅助有限元建模作为一种方法来估计木材的湿膨胀系数:对软木枝上的对生和压缩木材的案例研究

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-08-31 DOI: 10.1515/hf-2023-0014

S. Florisson, M. Hartwig, M. Wohlert, E. Gamstedt

{"title":"Microscopic computed tomography aided finite element modelling as a methodology to estimate hygroexpansion coefficients of wood: a case study on opposite and compression wood in softwood branches","authors":"S. Florisson, M. Hartwig, M. Wohlert, E. Gamstedt","doi":"10.1515/hf-2023-0014","DOIUrl":"https://doi.org/10.1515/hf-2023-0014","url":null,"abstract":"Abstract Microscopic X-ray computed tomography (XµCT) aided finite element (FE) modelling is a popular method in material science to relate material properties to heterogeneous microstructures. Recently, a methodology was developed for the XµCT aided FE modelling of wood, which characterises the process from specimen preparation to estimation of material properties. In the current research, this methodology is tested on branches of Norway spruce (Picea abies (L.) Karst.) to estimate the hygroexpansion coefficients of opposite (OW) and compression wood (CW). These properties are largely unknown and have engineering implications. The study is complemented by measurements of density, moisture content (MC) and elastic moduli. Results showed that the methodology assisted in the design of an integrated process and the identification of bottlenecks. It was seen that the level of detail of the numerical model had a strong influence on the obtained hygroexpansion properties. CW from branches showed higher density and longitudinal shrinkage coefficients, and elastic moduli less affected by MC. These differences are unlikely caused by MC, but more likely by the characteristics of the microstructure.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48768811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Planting spacing influences radial variation of basic density and chemical composition of wood from fast growing young Eucalyptus plantations 种植间距影响速生幼桉树人工林木材基本密度和化学成分的径向变化

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-08-04 DOI: 10.1515/hf-2023-0016

E. M. Pimenta, Emilly Gracielly dos Santos Brito, Paola Freitas Gomes, F. Ramalho, G. B. Vidaurre, A. M. Couto, O. Campoe, P. R. Hein

{"title":"Planting spacing influences radial variation of basic density and chemical composition of wood from fast growing young Eucalyptus plantations","authors":"E. M. Pimenta, Emilly Gracielly dos Santos Brito, Paola Freitas Gomes, F. Ramalho, G. B. Vidaurre, A. M. Couto, O. Campoe, P. R. Hein","doi":"10.1515/hf-2023-0016","DOIUrl":"https://doi.org/10.1515/hf-2023-0016","url":null,"abstract":"Abstract Planting spacing plays an important role in tree growth and wood formation. Thus, the aim of this study was to determinate how planting spacing and genetic material affect the radial variation of basic density and chemical composition of wood. The sampling of this study was based on 4 clones of Eucalyptus urophylla × Eucalyptus grandis at 5 years of age planted in four spacings (3 × 1, 3 × 2, 3 × 3 and 3 × 4 m). To determine the basic density (BD), extractive (EXT) and lignin (LT) content, wood discs were removed at breast height, which were sectioned in three radial positions (pith, intermediate and sapwood). The results showed that genetic material, planting spacing and radial position affected the values of BD, EXT and LT content. The BD and EXT content tended to increase with increased planting spacing, while the LT content tended to decrease. In relation to the radial variation, the basic density showed an increase in the pith-bark direction, while the EXT content showed a decrease in this direction. For LT, no significant difference was observed in the pith-bark direction. In general, the largest planting spacings promoted the highest rates of variation of the properties studied.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44352317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fit-free analysis of fluorescence lifetime imaging data using chemometrics approach for rapid and nondestructive wood species classification 使用化学计学方法对荧光寿命成像数据进行无拟合分析，实现木材物种的快速无损分类

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-08-04 DOI: 10.1515/hf-2023-0017

Te Ma, T. Inagaki, S. Tsuchikawa

{"title":"Fit-free analysis of fluorescence lifetime imaging data using chemometrics approach for rapid and nondestructive wood species classification","authors":"Te Ma, T. Inagaki, S. Tsuchikawa","doi":"10.1515/hf-2023-0017","DOIUrl":"https://doi.org/10.1515/hf-2023-0017","url":null,"abstract":"Abstract Conventional fluorescence spectroscopy has been suggested as a valuable tool for classifying wood species rapidly and non-destructively. However, because it is challenging to conduct absolute emission intensity measurements, fluorescence analysis statistics are difficult to obtain. In this study, another dimension of fluorescence, that is, fluorescence lifetime, was further evaluated to address this issue. A time-resolved fluorescence spectroscopic measurement system was first designed, mainly using a streak camera, picosecond pulsed laser at 403 nm, and a spectroscope, to collect the fluorescence time-delay (FTD) profiles and steady-state fluorescence intensity (FI) spectra simultaneously from 15 wood species. For data analysis, principal component analysis was used to “compress” the mean-centered FTD and FI spectra. Then, support vector machine classification analysis was utilized to train the wood species classification model based on their principal component scores. To avoid overfitting, ten-fold cross-validation was used to train the calibration model using 70 % of the total samples, and the remaining 30 % hold-out validation was used to test its reproducibility. The cross-validation accuracies were 100 % (5 softwoods) and 96 % (10 hardwoods), with test-validation accuracies of 96 % and 89 %.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47396039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Improved bleached eucalyptus kraft pulp-based tissue papers incorporating wet-strength resins 含湿强树脂的改进漂白桉木硫酸盐纸浆基薄纸

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-08-03 DOI: 10.1515/hf-2023-0007

Marina Matos, Ana M. M. S. Carta, P. Pinto, D. Evtuguin

{"title":"Improved bleached eucalyptus kraft pulp-based tissue papers incorporating wet-strength resins","authors":"Marina Matos, Ana M. M. S. Carta, P. Pinto, D. Evtuguin","doi":"10.1515/hf-2023-0007","DOIUrl":"https://doi.org/10.1515/hf-2023-0007","url":null,"abstract":"Abstract Common tissue paper manufacturing trends aim at partial or total replacement of softwood pulp with hardwood pulp for its production, such as bleached eucalyptus kraft pulp (BEKP), in order to optimize the process and the final product properties such as softness. However, the use of a single type of hardwood fiber results in lower strengths of both wet and dry webs. To maintain necessary strength and desired properties, the incorporation of several additives is often required. In this context, low molecular weight polyethylene glycol (PEG) and different wet strength resins, such as polyamideamine-epichlorohydrin (PAE) and glyoxalated polyacrylamide (GPAM) resins, were combined to achieve an innovated product with improved properties. In particular, wet and dry tensile strength was significantly improved when combining PEG and wet strength resins, especially observed in tissue papers prepared with PAE resin, high-charge cationic agent and bulk applied aqueous PEG solution. Noteworthy that water absorption capacity and softness of tissue paper were not critically affected by PEG incorporation, regardless of application method used (in bulk or by spray).","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45308043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0