Holzforschung最新文献_第6页

Decay resistance and dimensional stability of wood impregnated with castor oil using a pressure treatment 用压力处理蓖麻油浸渍木材的抗腐性和尺寸稳定性

3区农林科学

Holzforschung Pub Date : 2023-11-03 DOI: 10.1515/hf-2023-0050

Ohkyoung Kwon, Yeong Seo Choi, Wonsil Choi, Young-kyu Lee, Jongyeol Choi, Joon weon Choi, In Yang

{"title":"Decay resistance and dimensional stability of wood impregnated with castor oil using a pressure treatment","authors":"Ohkyoung Kwon, Yeong Seo Choi, Wonsil Choi, Young-kyu Lee, Jongyeol Choi, Joon weon Choi, In Yang","doi":"10.1515/hf-2023-0050","DOIUrl":"https://doi.org/10.1515/hf-2023-0050","url":null,"abstract":"Abstract This study was conducted to investigate the uptake of castor oil (CAO) in some wood specimens and the effect of CAO on the leaching ability, dimensional stability and fungal-decay resistance of the wood specimens. CAO was infused into the specimens using a pressure treatment. Uptakes of CAO penetrated in yellow poplar (YEP), Japanese cedar (JAC) and Douglas fir (DOF) blocks were higher than 100 %. The leaching ability of the CAO-based suspensions against saline water was the lowest in YEP, followed by Japanese larch (LAR), JAC and DOF. The retention values were 90 % or higher in most of the specimens. Radial and tangential swellings of CAO-treated strips submerged in saline water for 2 weeks were restrained compared to control specimens. No significant differences were found between bending strength and Janka hardness of CAO-treated and control strips. CAO treatment provided acceptable decay resistance to most wood specimens against Fomitopsis palustris and Trametes versicolor . Retention of CAO in the leached strips were identified through X-ray microscopic observation. Based on the results, CAO was determined to be an effective agent for improving the dimensional stability of wood. These results demonstrate the great potential of CAO as an environmentally friendly wood preservative and dimensional stabilizer, allowing CAO-permeated wood as raw materials for both indoor and outdoor use.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"152 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135777679","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

Comparative study of the stable carbon isotope ratio of cellulose, lignin and whole wood powder of Balanites aegyptiaca 埃及巴兰木纤维素、木质素和全木粉稳定碳同位素比值的比较研究

3区农林科学

Holzforschung Pub Date : 2023-11-01 DOI: 10.1515/hf-2023-0070

Dao Dougabka, Tikri Bianzeube, Togbé Armel Amadji, Jean Gérard, Wel-Doret Djonglibet, Ilham Bentaleb

{"title":"Comparative study of the stable carbon isotope ratio of cellulose, lignin and whole wood powder of <i>Balanites aegyptiaca</i>","authors":"Dao Dougabka, Tikri Bianzeube, Togbé Armel Amadji, Jean Gérard, Wel-Doret Djonglibet, Ilham Bentaleb","doi":"10.1515/hf-2023-0070","DOIUrl":"https://doi.org/10.1515/hf-2023-0070","url":null,"abstract":"Abstract This study involved analysing the carbon-13 isotope ratio (δ 13 C) of cellulose, lignin, and whole wood powder of Balanites aegyptiaca to determine the optimal substrate for future ecophysiological studies. From seven different trees (i.e., three from the Sudanian zone and four from the Chadian Sahelian zone), 21 samples were taken for this study. Identical variation trends were observed with cellulose, lignin, and whole wood powder, with δ 13 C values for cellulose always higher than for the other substrates, although the trees were located under different climatic conditions. The means obtained were −26.0 ‰, −28.7 ‰, and −27.1 ‰, for cellulose, lignin, and whole wood powder, respectively. Spearman’s correlation test, which was used to analyse relationships between the results, revealed a strong correlation ( r 2 = 0.93) between the δ 13 C cellulose values and those of whole wood powder from B . aegyptiaca , as well as between the δ 13 C cellulose values and those of lignin ( r 2 = 0.73). This strong correlation between cellulose and wood powder results, and between cellulose and lignin, suggests that the isolation of cellulose is not necessary for δ 13 C analysis of B . aegyptiaca wood.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"91 3-4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135163153","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

Mechanical, physical and compositional effects of Meruliporia incrassata on Southern Yellow Pine 南黄松的机械、物理和组成效应

3区农林科学

Holzforschung Pub Date : 2023-10-30 DOI: 10.1515/hf-2023-0074

Garrett Tatum, Natassia Brenkus

{"title":"Mechanical, physical and compositional effects of <i>Meruliporia incrassata</i> on Southern Yellow Pine","authors":"Garrett Tatum, Natassia Brenkus","doi":"10.1515/hf-2023-0074","DOIUrl":"https://doi.org/10.1515/hf-2023-0074","url":null,"abstract":"Abstract With the growing risk of fungal degradation in timber-framed structures from significant moisture intrusion events due to climate change, it is increasingly critical to develop mechanistic relationships between fungal degradation mechanisms and the strength of untreated wood components. While extensive work has been performed characterizing wood decay, no study has yet addressed the effects of Meruliporia incrassata on untreated Southern Yellow Pine. This seeks to address this knowledge gap by evaluating the effects of the common brown rot fungus on an ubiquitous building material in the southeast United States – Southern Yellow Pine. Properties of Southern Yellow Pine were evaluated at seven decay stages over the course of 12 weeks of exposure to M. incrassata . Changes in physical properties – mass, density, and moisture content – were measured at each stage. Changes in stiffness were characterized via ultrasonic pulse velocity testing, and thermogravimetric analysis was utilized to assess compositional changes. The study found rapid and significant losses in stiffness at decay stages as early as four-weeks. Hemicellulose and cellulose degradation occurred steadily throughout the decay period. These results can be utilized to develop a stronger understanding of the mechanical behavior of timber-framed structures in the United States degraded by brown rot.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136105888","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

Frontmatter 头版头条

3区农林科学

Holzforschung Pub Date : 2023-10-01 DOI: 10.1515/hf-2023-frontmatter10

引用次数: 0

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