Pub Date : 2023-07-20DOI: 10.1080/02773813.2023.2237498
Dorota Tomczak, M. Woźniak, I. Ratajczak, A. Sip, M. Baranowska, K. Bula, Iveta Čabalová, Tatiana Bubeníková, S. Borysiak
Abstract Polymer composites, based on the wood flour originating from an invasive black cherry (Prunus serotina Ehrh.) treated with caffeine to achieve increased bio-resistance, were obtained in this study. The caffeine-treated wood had a significant effect on the supermolecular structure of polymer matrix, resulting in a high content of polymorphic β-PP phase, as well as an increase in nucleation activity of wood surface. The caffeine treatment of wood was an effective method of achieving increased resistance of composites to selected fungi and bacteria while maintaining good mechanical strength and thermal resistance. Addition of black cherry wood to polymer matrix induced inhibition of the release of volatile organic compounds. Increased resistance to fungi and bacteria depended on formation a significant amount of the β-phase up to 35% in the composite with 30% of caffeine-treated wooden filler and a simultaneous decrease in crystallinity from 52% for pure PP to 45% for mentioned composite.
{"title":"Caffeine-treated wood as an innovative filler for advanced polymer composites","authors":"Dorota Tomczak, M. Woźniak, I. Ratajczak, A. Sip, M. Baranowska, K. Bula, Iveta Čabalová, Tatiana Bubeníková, S. Borysiak","doi":"10.1080/02773813.2023.2237498","DOIUrl":"https://doi.org/10.1080/02773813.2023.2237498","url":null,"abstract":"Abstract Polymer composites, based on the wood flour originating from an invasive black cherry (Prunus serotina Ehrh.) treated with caffeine to achieve increased bio-resistance, were obtained in this study. The caffeine-treated wood had a significant effect on the supermolecular structure of polymer matrix, resulting in a high content of polymorphic β-PP phase, as well as an increase in nucleation activity of wood surface. The caffeine treatment of wood was an effective method of achieving increased resistance of composites to selected fungi and bacteria while maintaining good mechanical strength and thermal resistance. Addition of black cherry wood to polymer matrix induced inhibition of the release of volatile organic compounds. Increased resistance to fungi and bacteria depended on formation a significant amount of the β-phase up to 35% in the composite with 30% of caffeine-treated wooden filler and a simultaneous decrease in crystallinity from 52% for pure PP to 45% for mentioned composite.","PeriodicalId":17493,"journal":{"name":"Journal of Wood Chemistry and Technology","volume":"43 1","pages":"271 - 288"},"PeriodicalIF":2.0,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42784438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Spalted heartwood is valued for its vibrant colors, patterns, and decay-free appearance. Using microscopy, scanning electron microscopy with energy-dispersive spectroscopy, transmission electron microscopy, and non-targeted metabolomics, we aimed to study some distinctive features of black patterning. The results showed that cocci might be associated with the production of spalted heartwood. There was an absence of decay in the spalted heartwood because the cocci had not aggressively attacked the cell walls. 4-pyridoxine, often associated with the bacterial stimulation of organisms, was identified as an upregulated metabolite in the black-patterned wood compared to non-colored areas. We identified four primary metabolic pathways related to bacterial activity associated with the black patterning: pentose and glucuronate interconversions, ATP-binding cassette transporters, histidine metabolism, and plant hormone signal transduction. These results suggest that microbes might play a significant role in the development of the heartwood’s distinctive black pattern in Diospyros spp.
{"title":"Microscopic features and untargeted metabolomics reveal special features of the black-patterning in spalted heartwood of Diospyros spp.","authors":"Zhi Li, Rui Yang, Xiaorui Yang, Huiwen Jia, Jian Qiu","doi":"10.1080/02773813.2023.2229300","DOIUrl":"https://doi.org/10.1080/02773813.2023.2229300","url":null,"abstract":"Abstract Spalted heartwood is valued for its vibrant colors, patterns, and decay-free appearance. Using microscopy, scanning electron microscopy with energy-dispersive spectroscopy, transmission electron microscopy, and non-targeted metabolomics, we aimed to study some distinctive features of black patterning. The results showed that cocci might be associated with the production of spalted heartwood. There was an absence of decay in the spalted heartwood because the cocci had not aggressively attacked the cell walls. 4-pyridoxine, often associated with the bacterial stimulation of organisms, was identified as an upregulated metabolite in the black-patterned wood compared to non-colored areas. We identified four primary metabolic pathways related to bacterial activity associated with the black patterning: pentose and glucuronate interconversions, ATP-binding cassette transporters, histidine metabolism, and plant hormone signal transduction. These results suggest that microbes might play a significant role in the development of the heartwood’s distinctive black pattern in Diospyros spp.","PeriodicalId":17493,"journal":{"name":"Journal of Wood Chemistry and Technology","volume":"43 1","pages":"243 - 252"},"PeriodicalIF":2.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41496691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-28DOI: 10.1080/02773813.2023.2224301
Y. K. Verma, A. K. Singh, M. Paswan, Priyeshiv Kumar Gurmaita
Abstract This current study aims to extract bamboo fibers from different species of bamboo using the mechanochemical method and investigate their properties. The bamboo species used in this study were Dendrocalamus, Bambusa balcoaa, Oliveri, Asamica, and Chimono. The vacuum-pressurized impregnation treatment process was employed for treating the bamboo. The mechanochemical method was chosen for extracting the bamboo fibers due to its simplicity and efficiency. The yield percentage of the bamboo fibers was determined. X-ray diffraction (XRD) analysis showed an increase in the crystallinity of the bamboo fibers with subsequent treatments in the presence of NaOH, as evidenced by two well-defined peaks at 2θ = 17.6° and 2θ = 22.7°. FTIR analysis revealed the presence of numerous hydroxyl groups in the bamboo fibers, indicated by the –OH expanding and contracting vibration at the band around 3311 cm−1. Thermal gravimetric analysis (TGA) was conducted to investigate the thermal stability of the bamboo fibers, and the results demonstrated that chimino bamboo fiber exhibited the highest level of thermal stability compared to other treated bamboo fibers. Scanning electron microscopy (SEM) was employed for morphological characterization, providing insights into the surface morphology of the bamboo fibers. Based on the findings, it can be inferred that bamboo fibers, particularly of the chimino type, have the potential to serve as a viable reinforcement in polymeric composites for lightweight applications in various industries, such as automotive, aerospace, and packaging.
{"title":"A novel approach to extract and characterize vacuum-pressurized bamboo fibers using mechano-chemical techniques","authors":"Y. K. Verma, A. K. Singh, M. Paswan, Priyeshiv Kumar Gurmaita","doi":"10.1080/02773813.2023.2224301","DOIUrl":"https://doi.org/10.1080/02773813.2023.2224301","url":null,"abstract":"Abstract This current study aims to extract bamboo fibers from different species of bamboo using the mechanochemical method and investigate their properties. The bamboo species used in this study were Dendrocalamus, Bambusa balcoaa, Oliveri, Asamica, and Chimono. The vacuum-pressurized impregnation treatment process was employed for treating the bamboo. The mechanochemical method was chosen for extracting the bamboo fibers due to its simplicity and efficiency. The yield percentage of the bamboo fibers was determined. X-ray diffraction (XRD) analysis showed an increase in the crystallinity of the bamboo fibers with subsequent treatments in the presence of NaOH, as evidenced by two well-defined peaks at 2θ = 17.6° and 2θ = 22.7°. FTIR analysis revealed the presence of numerous hydroxyl groups in the bamboo fibers, indicated by the –OH expanding and contracting vibration at the band around 3311 cm−1. Thermal gravimetric analysis (TGA) was conducted to investigate the thermal stability of the bamboo fibers, and the results demonstrated that chimino bamboo fiber exhibited the highest level of thermal stability compared to other treated bamboo fibers. Scanning electron microscopy (SEM) was employed for morphological characterization, providing insights into the surface morphology of the bamboo fibers. Based on the findings, it can be inferred that bamboo fibers, particularly of the chimino type, have the potential to serve as a viable reinforcement in polymeric composites for lightweight applications in various industries, such as automotive, aerospace, and packaging.","PeriodicalId":17493,"journal":{"name":"Journal of Wood Chemistry and Technology","volume":"802 ","pages":"230 - 242"},"PeriodicalIF":2.0,"publicationDate":"2023-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41278909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-22DOI: 10.1080/02773813.2023.2224303
Yinping Li, Qing He, Xiaoqing Zhu, Z. Geng, Yi Wang, Jin Li
{"title":"A comparative study of the mineral elements in different medicinal plant parts of Daphne altaica Pall.","authors":"Yinping Li, Qing He, Xiaoqing Zhu, Z. Geng, Yi Wang, Jin Li","doi":"10.1080/02773813.2023.2224303","DOIUrl":"https://doi.org/10.1080/02773813.2023.2224303","url":null,"abstract":"","PeriodicalId":17493,"journal":{"name":"Journal of Wood Chemistry and Technology","volume":"1 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2023-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41812523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Three-dimensional hydrophobic and efficient electromagnetic shielding Cu/wood/Cu laminated composites were prepared by a simple one-step electroless Cu process. The number of electroless Cu on wood surface and the treatment time of electroless Cu were used as variables. The effects of independent variables in the range from 0.3 ×10−3 to 3.0 GHz (L-band) on the conductivity, water contact angle and electromagnetic shielding effectiveness of the composite were analyzed. The Cu particles are fully filled in the wood hierarchical porous structure, and the metal coating uniformly covers the entire wood surface. After three times of electroless Cu, the conductivity of the composite can reach 7255 S/cm, the contact angle is 130.8° when the time is 12 min, showing good hydrophobic properties, and the average electromagnetic shielding effectiveness is as high as 96 dB. Compared with the L-band (94 dB), the twice electroless sample has a maximum shielding effectiveness of 85.6 dB in the X-band (8.2-12.4 GHz), which can shield a large number of incident electromagnetic waves to achieve high absorption and low reflection. The anisotropic internal porous structure of wood matrix and the multi-interface polarization between wood and Cu are the main reasons for the effective electromagnetic interference shielding performance of Cu/wood/Cu laminated composites.
{"title":"Efficient electromagnetic interference shielding of three-dimensional hydrophobic Cu/wood/Cu porous composites","authors":"Yanfei Pan, Shuaiqi Hu, Xin Zheng, Nianguang Hu, Fengqi Qiu, Mayin Dai, Qi Guo, Xiaofang Yu, Yinan Hao, Minyan Lv, Jintian Huang","doi":"10.1080/02773813.2023.2213691","DOIUrl":"https://doi.org/10.1080/02773813.2023.2213691","url":null,"abstract":"Abstract Three-dimensional hydrophobic and efficient electromagnetic shielding Cu/wood/Cu laminated composites were prepared by a simple one-step electroless Cu process. The number of electroless Cu on wood surface and the treatment time of electroless Cu were used as variables. The effects of independent variables in the range from 0.3 ×10−3 to 3.0 GHz (L-band) on the conductivity, water contact angle and electromagnetic shielding effectiveness of the composite were analyzed. The Cu particles are fully filled in the wood hierarchical porous structure, and the metal coating uniformly covers the entire wood surface. After three times of electroless Cu, the conductivity of the composite can reach 7255 S/cm, the contact angle is 130.8° when the time is 12 min, showing good hydrophobic properties, and the average electromagnetic shielding effectiveness is as high as 96 dB. Compared with the L-band (94 dB), the twice electroless sample has a maximum shielding effectiveness of 85.6 dB in the X-band (8.2-12.4 GHz), which can shield a large number of incident electromagnetic waves to achieve high absorption and low reflection. The anisotropic internal porous structure of wood matrix and the multi-interface polarization between wood and Cu are the main reasons for the effective electromagnetic interference shielding performance of Cu/wood/Cu laminated composites.","PeriodicalId":17493,"journal":{"name":"Journal of Wood Chemistry and Technology","volume":"43 1","pages":"206 - 220"},"PeriodicalIF":2.0,"publicationDate":"2023-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49472202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-22DOI: 10.1080/02773813.2023.2213205
Lei Li, Zejin Tian, Wenxin Lu, Ming Tian, Mingzheng Hao, Wen Wang
Abstract A recent research focus has been on developing sustainable and renewable high-performance electromagnetic shielding materials. We present here a robust and effective top-down method in which polydopamine (PDA) is added to delignified wood via in situ polymerization, and Ag particles are successfully deposited in the wood channel via PDA’s adhesive property with a subsequent silver mirror reaction. According to our findings, when the AgNO3 content is 30 g/L, the conductivity of 2-mm-thick conductive wood reached 500 S/cm with an electromagnetic interference shielding efficiency of 50 dB in the X-band. The three-dimensional network structure of the wood is preserved, and thus it has good mechanical properties. Hence, silver-plated wood can be used as an electromagnetic shielding material that requires high strength. Graphical Abstract
{"title":"Preparation of highly conductive silver-plated porous wood","authors":"Lei Li, Zejin Tian, Wenxin Lu, Ming Tian, Mingzheng Hao, Wen Wang","doi":"10.1080/02773813.2023.2213205","DOIUrl":"https://doi.org/10.1080/02773813.2023.2213205","url":null,"abstract":"Abstract A recent research focus has been on developing sustainable and renewable high-performance electromagnetic shielding materials. We present here a robust and effective top-down method in which polydopamine (PDA) is added to delignified wood via in situ polymerization, and Ag particles are successfully deposited in the wood channel via PDA’s adhesive property with a subsequent silver mirror reaction. According to our findings, when the AgNO3 content is 30 g/L, the conductivity of 2-mm-thick conductive wood reached 500 S/cm with an electromagnetic interference shielding efficiency of 50 dB in the X-band. The three-dimensional network structure of the wood is preserved, and thus it has good mechanical properties. Hence, silver-plated wood can be used as an electromagnetic shielding material that requires high strength. Graphical Abstract","PeriodicalId":17493,"journal":{"name":"Journal of Wood Chemistry and Technology","volume":"17 8","pages":"195 - 205"},"PeriodicalIF":2.0,"publicationDate":"2023-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41257634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Rotation welding of wood dowels has the advantages of high bonding strength, fast processing speed and green environmental protection, and is suitable for jointing nodes in furniture and wood products. However, most wood friction welding specimens have poor water resistance where the welded joints are more likely to be damaged in wet environments, which greatly limits their wider application. Previous studies focused on using natural and green materials or methods to enhance bonding strength and water resistance of friction-welded joints. This paper reveals an innovative chemical pretreatment method to improve the water resistance of rotary friction welded joints by treating the substrate blocks or dowels with reagents that successively oxidize and sulfonate the wood, and spraying the dowels with Zinc acetate alcohol solution that has a lubricant effect, followed by friction welding. The findings show that both the dry bonding strength of friction welded joints and the wet bonding strength after impregnation with cold, hot, and boiling water of dowels pretreated with oxidation and sulfonation reactions were higher than those without pretreatment and significantly superior to the traditional polyvinyl acetate (PVAc) adhesive bonding. Graphical Abstract
{"title":"Study on water resistance improvement of wood dowel rotation welding joints","authors":"Suxia Li, Jiarong He, Jiawei Wu, Yang Yang, Qiyu Sun, Xiaoning Lu, Zhongfeng Zhang","doi":"10.1080/02773813.2023.2204858","DOIUrl":"https://doi.org/10.1080/02773813.2023.2204858","url":null,"abstract":"Abstract Rotation welding of wood dowels has the advantages of high bonding strength, fast processing speed and green environmental protection, and is suitable for jointing nodes in furniture and wood products. However, most wood friction welding specimens have poor water resistance where the welded joints are more likely to be damaged in wet environments, which greatly limits their wider application. Previous studies focused on using natural and green materials or methods to enhance bonding strength and water resistance of friction-welded joints. This paper reveals an innovative chemical pretreatment method to improve the water resistance of rotary friction welded joints by treating the substrate blocks or dowels with reagents that successively oxidize and sulfonate the wood, and spraying the dowels with Zinc acetate alcohol solution that has a lubricant effect, followed by friction welding. The findings show that both the dry bonding strength of friction welded joints and the wet bonding strength after impregnation with cold, hot, and boiling water of dowels pretreated with oxidation and sulfonation reactions were higher than those without pretreatment and significantly superior to the traditional polyvinyl acetate (PVAc) adhesive bonding. Graphical Abstract","PeriodicalId":17493,"journal":{"name":"Journal of Wood Chemistry and Technology","volume":"43 1","pages":"177 - 194"},"PeriodicalIF":2.0,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44005325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-19DOI: 10.1080/02773813.2023.2214131
M. Nishida, Mitsuru Abe, M. Seki, T. Miki, Hiroyuki Sugimoto
Abstract Interactions between the hierarchical structure of Japanese cypress and small hydroxylic solvents with high polarity were studied using variable-temperature 13C cross-polarization and magic-angle spinning nuclear magnetic resonance (CP/MAS) NMR spectroscopy, including low-temperature measurements. 13C CP/MAS NMR spectra were enhanced by dipolar interactions closely related to 1H–13C magnetization transfer, providing information about the interaction between woody materials and small hydroxyl molecules. The change in interaction was particularly near the melting point of the hydroxylic solvent, where a decrease in the intensity of the cypress carbohydrate signal and the appearance of the signal of solvent molecules were observed. The trend of signal intensity in the variable-temperature 13C CP/MAS NMR spectra of cypress and cellulose fibers in the presence of hydroxylic solvents indicated that the decrease in the carbohydrate signal intensity due to the transfer of magnetization near the melting point of the hydroxyl molecule is greater when the size of the hydroxyl molecule is smaller. Furthermore, molecular association in the nanopores of the hierarchical structure allowed the hydroxyl molecular signals of the impregnated cypress to appear above the melting point.
{"title":"Variable-temperature solid-state NMR analysis of woody materials in the presence of small hydroxyl molecules","authors":"M. Nishida, Mitsuru Abe, M. Seki, T. Miki, Hiroyuki Sugimoto","doi":"10.1080/02773813.2023.2214131","DOIUrl":"https://doi.org/10.1080/02773813.2023.2214131","url":null,"abstract":"Abstract Interactions between the hierarchical structure of Japanese cypress and small hydroxylic solvents with high polarity were studied using variable-temperature 13C cross-polarization and magic-angle spinning nuclear magnetic resonance (CP/MAS) NMR spectroscopy, including low-temperature measurements. 13C CP/MAS NMR spectra were enhanced by dipolar interactions closely related to 1H–13C magnetization transfer, providing information about the interaction between woody materials and small hydroxyl molecules. The change in interaction was particularly near the melting point of the hydroxylic solvent, where a decrease in the intensity of the cypress carbohydrate signal and the appearance of the signal of solvent molecules were observed. The trend of signal intensity in the variable-temperature 13C CP/MAS NMR spectra of cypress and cellulose fibers in the presence of hydroxylic solvents indicated that the decrease in the carbohydrate signal intensity due to the transfer of magnetization near the melting point of the hydroxyl molecule is greater when the size of the hydroxyl molecule is smaller. Furthermore, molecular association in the nanopores of the hierarchical structure allowed the hydroxyl molecular signals of the impregnated cypress to appear above the melting point.","PeriodicalId":17493,"journal":{"name":"Journal of Wood Chemistry and Technology","volume":"43 1","pages":"221 - 229"},"PeriodicalIF":2.0,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43337883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-25DOI: 10.1080/02773813.2023.2202191
Xiao Song, Haiqing Zhou, Ziqiang Liu, Xiaolong Li, Chunpeng Han
Abstract In this article, cement-based wood composites (CWC) were prepared by the hydrostatic method using waste wood chips as filler material and cement mortar as the binder. The effects of wood content, wood particle size, and wood modification method on flexural strength, modulus of elasticity, and toughness were experimentally investigated. The results showed that the flexural toughness of the specimens became more pronounced with the increasing wood content and particle size, and the maximum value was 0.742. The flexural toughness of the samples reached the maximum value at 30% wood content after the wood was modified by NaOH and silane coupling agent. The changes in flexural strength and elastic modulus of the specimens were consistent, and both decreased with the increase in wood content. A positive correlation between the flexural strength of the samples and the wood particle size was observed. About 30% wood content, 5.0–10.0 mm wood particle size, and NaOH modification are recommended to prepare the composites. This research can open new avenues for the research and promotion of CWC paving materials.
{"title":"Fabrication and mechanical properties of waste wood chips/cements composites for paving materials","authors":"Xiao Song, Haiqing Zhou, Ziqiang Liu, Xiaolong Li, Chunpeng Han","doi":"10.1080/02773813.2023.2202191","DOIUrl":"https://doi.org/10.1080/02773813.2023.2202191","url":null,"abstract":"Abstract In this article, cement-based wood composites (CWC) were prepared by the hydrostatic method using waste wood chips as filler material and cement mortar as the binder. The effects of wood content, wood particle size, and wood modification method on flexural strength, modulus of elasticity, and toughness were experimentally investigated. The results showed that the flexural toughness of the specimens became more pronounced with the increasing wood content and particle size, and the maximum value was 0.742. The flexural toughness of the samples reached the maximum value at 30% wood content after the wood was modified by NaOH and silane coupling agent. The changes in flexural strength and elastic modulus of the specimens were consistent, and both decreased with the increase in wood content. A positive correlation between the flexural strength of the samples and the wood particle size was observed. About 30% wood content, 5.0–10.0 mm wood particle size, and NaOH modification are recommended to prepare the composites. This research can open new avenues for the research and promotion of CWC paving materials.","PeriodicalId":17493,"journal":{"name":"Journal of Wood Chemistry and Technology","volume":"43 1","pages":"164 - 175"},"PeriodicalIF":2.0,"publicationDate":"2023-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47563520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-24DOI: 10.1080/02773813.2023.2200751
Karen Keli Barbosa Abrantes, Rayane Monique Sete da Cruz, T. V. Barros, Eliezer Rodrigues de Souto, J. Paes, L. Cardozo-Filho
Abstract We investigated antifungal properties of two kraft-pulping liquors as potential environmentally friendly wood preservatives targeting in deterioration by white rot (WRF) and brown rot fungi (BRF). The in vitro antifungal activity of crude black liquor (BL) and the product from a hydrothermal gasification (BLWSupc) process were investigated. Both products showed high bioactivity, with BL completely inhibiting the activity of WRF and BRF; 80% was entirely suppressed at low BL concentrations (5–10% vol/vol). Using the BLWSupc at 2.55% wt/wt, we achieved the same inhibitory effect as BL (15% vol/vol) for the two fungi. These antifungal effects can be explained by the composition of liquors that act as antioxidants, promoting enzymatic inactivation and inhibiting the growth of WRF and BRF. BLWSupc exhibited radical quenching activity against DPPH of 43.9%, and the BL, a phenolic content about 20 times higher (23.635 mg/L) than BLWSupc (2.093 mg/L), suggesting that antifungal activity of BL and BLW is related to their chemical composition. An opportunity demonstrated by this study is the reuse of BLWSupc as a protective treatment within a sustainable chain.
{"title":"Antifungal activity in vitro using kraft-pulping crude black liquor and hydrothermal treatment black liquor against wood-decaying fungi","authors":"Karen Keli Barbosa Abrantes, Rayane Monique Sete da Cruz, T. V. Barros, Eliezer Rodrigues de Souto, J. Paes, L. Cardozo-Filho","doi":"10.1080/02773813.2023.2200751","DOIUrl":"https://doi.org/10.1080/02773813.2023.2200751","url":null,"abstract":"Abstract We investigated antifungal properties of two kraft-pulping liquors as potential environmentally friendly wood preservatives targeting in deterioration by white rot (WRF) and brown rot fungi (BRF). The in vitro antifungal activity of crude black liquor (BL) and the product from a hydrothermal gasification (BLWSupc) process were investigated. Both products showed high bioactivity, with BL completely inhibiting the activity of WRF and BRF; 80% was entirely suppressed at low BL concentrations (5–10% vol/vol). Using the BLWSupc at 2.55% wt/wt, we achieved the same inhibitory effect as BL (15% vol/vol) for the two fungi. These antifungal effects can be explained by the composition of liquors that act as antioxidants, promoting enzymatic inactivation and inhibiting the growth of WRF and BRF. BLWSupc exhibited radical quenching activity against DPPH of 43.9%, and the BL, a phenolic content about 20 times higher (23.635 mg/L) than BLWSupc (2.093 mg/L), suggesting that antifungal activity of BL and BLW is related to their chemical composition. An opportunity demonstrated by this study is the reuse of BLWSupc as a protective treatment within a sustainable chain.","PeriodicalId":17493,"journal":{"name":"Journal of Wood Chemistry and Technology","volume":"43 1","pages":"150 - 163"},"PeriodicalIF":2.0,"publicationDate":"2023-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47406877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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