Maderas-ciencia Y Tecnologia最新文献_第10页

Efecto en las propiedades mecánicas de una resina pinífera modificada biodegradable, al utilizarla como compatibilizante o acoplante en formulaciones elastoméricas sin o con fibra de agave y hule de poli(estireno-butadieno). Un paso hacia la formulación de elastómeros verdes 对生物可降解改性松木树脂机械性能的影响，使用它作为增塑剂或耦合到弹性体配方中，不使用或使用龙舌兰纤维和聚(苯乙烯-丁二烯)橡胶。迈向绿色弹性体配方的一步

IF 1.5 4区农林科学

Maderas-ciencia Y Tecnologia Pub Date : 2021-09-01 DOI: 10.4067/s0718-221x2021000100464

Francisco José Aranda-García, Mónica Paola Rodríguez-Ortiz, Rodrigo Allan Pereira, E. Mendizábal, C. F. Jasso-Gastinel

{"title":"Efecto en las propiedades mecánicas de una resina pinífera modificada biodegradable, al utilizarla como compatibilizante o acoplante en formulaciones elastoméricas sin o con fibra de agave y hule de poli(estireno-butadieno). Un paso hacia la formulación de elastómeros verdes","authors":"Francisco José Aranda-García, Mónica Paola Rodríguez-Ortiz, Rodrigo Allan Pereira, E. Mendizábal, C. F. Jasso-Gastinel","doi":"10.4067/s0718-221x2021000100464","DOIUrl":"https://doi.org/10.4067/s0718-221x2021000100464","url":null,"abstract":"In this work, the effectiveness of a biodegradable modified pine rosin (Amberyl MP-30 (A-30)), is evaluated as compatibilizer or coupling agent to substitute resorcinol (which is toxic and non-biodegradable) in elastomeric formulations. Their mechanical properties are compared vs formulations containing resorcinol-hexamethylenetetramine (R-HMT) in: a) styrene–butadiene elastomers (SBRs), and: b) SBR composites reinforced with discarded agave fibers. For the comparison as compatibilizer, equivalent formulations containing resorcinol or A-30 are prepared. Likewise, for the equivalent composites comparison, the coupling agent (R-HMT or A-30) and sulfur amount as crosslinking agent (2,5 parts per 100 rubber (phr), 7,5 phr or 15 parts per 100 phr) are varied. The Tensile tests at room temperature, and the mechanodynamic analysis using sweeps of temperature (from 70 °C to 40 °C) and frequency (from 0,4 Hz to 40 Hz), allowed the observation of moduli improvements (up to 74 % in Young modulus) and deformation capacity (up to 260 %) for the materials with A-30 over the materials where resorcinol was used. The better performance as compatibilizer or coupling agent of the A-30 was also shown with clarity in the morphological characterization, showing higher compacity in the formulated polymer matrix, and higher closeness between matrix and fibers, comparing with fractured samples using R-HMT. It has been shown here, that formulating rubbers or elastomeric composites with A-30 and HMT, can successfully substitute the R-HMT pair, because it works better as compatibilizer or coupling agent and is biodegradable. Agents of natural origin like this one, have a great potential to contribute to the development of elastomers and flexible composites that are environmentally friendly.","PeriodicalId":18092,"journal":{"name":"Maderas-ciencia Y Tecnologia","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90347959","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}

引用次数: 0

Comparative performance of Polymeric Xylenol Tetrasulfide versus creosote in an AWPA E7 field stake test 在AWPA E7现场木桩试验中，聚合物二甲酚四硫醚与杂酚油的性能比较

IF 1.5 4区农林科学

Maderas-ciencia Y Tecnologia Pub Date : 2021-09-01 DOI: 10.4067/s0718-221x2021000100460

D. Nicholas, Amy Rowlen, D. Milsted

{"title":"Comparative performance of Polymeric Xylenol Tetrasulfide versus creosote in an AWPA E7 field stake test","authors":"D. Nicholas, Amy Rowlen, D. Milsted","doi":"10.4067/s0718-221x2021000100460","DOIUrl":"https://doi.org/10.4067/s0718-221x2021000100460","url":null,"abstract":"A need exists to develop new organic, environmentally benign wood preservatives for industrial applications to replace the older creosote and pentachlorophenol systems. In this study the performance of creosote at three retentions was compared to a new wood preservative candidate formulated with Polymeric Xylenol Tetrasulfide (PXTS) in an E7 AWPA field study using two sets of southern pine and yellow poplar field stakes treated with three creosote retentions or five retentions of PXTS. The stakes were installed at two test sites and evaluated after 3,5 years, 6 years, and 14 years exposure. After six years of exposure at both sites, which is double the minimum recommended exposure period of three years’ field data for AWPA submission of a proposed new preservative system, the average decay ratings data for southern pine stakes after three years exposure was not sufficient to definitively determine which system provides superior protection against decay and termite attack (Creosote at the AWPA UC4B pole retentions versus pine stakes treated with much lower PXTS levels). However, after a longer exposure time of 14 years the data conclusively shows that pine stakes treated to the utility pole AWPA UC4B creosote retention performed poorer at both sites against decay and termite degradation than pine stakes treated with 26 Kg/m3 PXTS. Similar results were obtained with the yellow poplar stakes. We conclude that: 1) much longer E7 exposure times are necessary then the minimum recommended three years in the AWPA GDA Standard for submission of new systems to definitively determine the efficacy of a proposed oil borne system compared to the efficacy of a traditional organic preservative for commercial applications, and 2) long term field PXTS performance against decay and termite deterioration is equal or greater than that obtained with creosote at about four times the PXTS retention.","PeriodicalId":18092,"journal":{"name":"Maderas-ciencia Y Tecnologia","volume":"23 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84515588","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}

引用次数: 0

Decay capabilities of basidiomycetes colonizing air-seasoning red oak and blackgum railroad ties 空气调味红橡木和黑胶铁路枕木定殖担子菌的腐烂能力

IF 1.5 4区农林科学

Maderas-ciencia Y Tecnologia Pub Date : 2021-09-01 DOI: 10.4067/s0718-221x2021000100459

Leon Rogers, Jed Cappellazzi, J. Morrell

引用次数: 0

Comparison of some wood properties of juvenile black pines of different origin planted in the same habitat 同一生境不同产地黑松幼松木材特性比较

IF 1.5 4区农林科学

Maderas-ciencia Y Tecnologia Pub Date : 2021-09-01 DOI: 10.4067/s0718-221x2021000100466

M. Arslan, Erkan Avci, A. Tozluoğlu, T. Birtürk, A. Saraçbaşi, E. Örtel

引用次数: 1

Biochemical features of organic extractives from Eucalyptus and Corymbia woods using ethanol as a solvent 以乙醇为溶剂提取桉木和山茱萸有机提取物的生化特性

IF 1.5 4区农林科学

Maderas-ciencia Y Tecnologia Pub Date : 2021-08-01 DOI: 10.4067/s0718-221x2021000100807

K. T. Barbosa, A. Acosta, H. Schulz, I. Santi, R. Delucis, R. Beltrame, D. Gatto

{"title":"Biochemical features of organic extractives from Eucalyptus and Corymbia woods using ethanol as a solvent","authors":"K. T. Barbosa, A. Acosta, H. Schulz, I. Santi, R. Delucis, R. Beltrame, D. Gatto","doi":"10.4067/s0718-221x2021000100807","DOIUrl":"https://doi.org/10.4067/s0718-221x2021000100807","url":null,"abstract":"The objective of this study is to evaluate chemical characteristics, as well as antioxidant and antibacterial activities of organic compounds extracted from three Eucalyptus woods and Corymbia maculate wood using ethanol as a solvent. To obtain the ethanolic extracts, 15 g of a powdered wood sample was mixed with 150 mL of ethyl alcohol 99 % PA by constant mechanical stirring, which was further magnetically mixed at 60 oC for 24 h. The extractives were analyzed by means of percent yield, Fourier-transform infrared spectrum, inhibitory index (measured after antimicrobial tests), antioxidant activity, and condensed tannins content. The Eucalyptus dunnii extract showed the highest percent yield. The infrared spectra of all the extractives presented similar profiles, with remarkable bands ascribed to the presence of lipophilic extracts, sterols, fatty acids, and other hydroxylated substances, such as carbohydrates and phenolic compounds. In all cases, the higher the concentration of the extractive was, the higher the antioxidant activity was. The antioxidant activity of Eucalyptus saligna extract stood out since overcame that of the positive control (ascorbic acid). Regarding the condensed tannins content, that extract from Eucalyptus grandis excelled","PeriodicalId":18092,"journal":{"name":"Maderas-ciencia Y Tecnologia","volume":"44 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88636103","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}

引用次数: 0

Vigas de pino resinoso del noreste de Argentina bajo cargas de larga duración: Deformaciones, recuperación y criterios de diseño 阿根廷东北部长期荷载下的树脂松梁:变形、恢复和设计标准

IF 1.5 4区农林科学

Maderas-ciencia Y Tecnologia Pub Date : 2021-08-01 DOI: 10.4067/s0718-221x2021000100455

P. Y. Fank, María del Rocío Ramos, Eduardo Antonio Torrán, María Alexandra Sosa-Zitto, J. C. Piter

引用次数: 0

Efficient utilization of corn stalk and poplar planer shavings in manufacturing particleboard 玉米秸秆和杨树刨花在刨花板制造中的高效利用

IF 1.5 4区农林科学

Maderas-ciencia Y Tecnologia Pub Date : 2021-07-01 DOI: 10.4067/S0718-221X2021000100449

A. Abdulqader

引用次数: 1

Preparation and performance of tannin-glyoxal-urea resin-bonded grinding wheel loaded with SiO2 reinforcing particles 负载SiO2增强颗粒的单宁-乙二醛-尿素树脂结合砂轮的制备及性能研究

IF 1.5 4区农林科学

Maderas-ciencia Y Tecnologia Pub Date : 2021-07-01 DOI: 10.4067/S0718-221X2021000100448

Jun Zhang, Bowen Liu, Yunxia Zhou, H. Essawy, Jinxing Li, Qian Chen, Xiaojian Zhou, G. Du

{"title":"Preparation and performance of tannin-glyoxal-urea resin-bonded grinding wheel loaded with SiO2 reinforcing particles","authors":"Jun Zhang, Bowen Liu, Yunxia Zhou, H. Essawy, Jinxing Li, Qian Chen, Xiaojian Zhou, G. Du","doi":"10.4067/S0718-221X2021000100448","DOIUrl":"https://doi.org/10.4067/S0718-221X2021000100448","url":null,"abstract":"In this study, an easily prepared bio-based abrasive grinding wheel based on tannin–glyoxal–urea (TGU) thermosetting matrix is presented.The synthesised resin was prepared via co-polycondensation reaction of glyoxal and ureawith condensed tannin, which is a forest-derived product. Fourier transform infrared spectroscopy and electrospray ionisation mass spectrometry results confirmed that urea and glyoxal react well under acidic conditions and that –(OH)CH–NH–group is primarily involved in TGU cross-linking. Differential scanning calorimetry, thermomechanical analysis and thermogravimetric analysis investigations showed that the preparation of TGU resin is easier compared to commercial phenol–formaldehyde (PF) resin; moreover, TGU resin has a more robust chemical network structure, which contributes efficiently to heat resistance and improved mechanical properties. This observation is supported by Brinell hardness, compression resistance and grinding testing; these showed that the new grinding wheel acquired higher hardness, superior resistance against compression and stronger abrasion resistance compared with a PFbased grinding wheel prepared in the laboratory. Moreover, few holes and no cracks were found in the new grinding wheel. 1Southwest Forestry University, Yunnan Key Laboratory of Wood Adhesives and Glued Products, Kunming, China. 2Southwest Forestry University, Key Laboratory of State forestry and Grassand Administration on highly efficient utilisation of forestry biomass resources in Southwest of China, Kunming, China. 3National Research Centre, Department of Polymers and Pigments, Dokki, Cairo, Egypt. ♠Corresponding authors: chenqian@hit.edu.cn ; xiaojianzhou1982@163.com Received: 10.09.2020 Accepted: 19.04.2021 Maderas. Ciencia y tecnología 2021 (23): 48, 1-16 Universidad del Bío-Bío 2","PeriodicalId":18092,"journal":{"name":"Maderas-ciencia Y Tecnologia","volume":"11 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81825592","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}

引用次数: 2

Biologically synthesised copper oxide and zinc oxide nanoparticle formulation as an environmentally friendly wood protectant for the management of wood borer, Lyctus africanus 生物合成氧化铜和氧化锌纳米颗粒配方作为环境友好的木材保护剂，用于管理木蛀虫，Lyctus非洲

IF 1.5 4区农林科学

Maderas-ciencia Y Tecnologia Pub Date : 2021-07-01 DOI: 10.4067/S0718-221X2021000100447

K. S. Shiny, R. Sundararaj

{"title":"Biologically synthesised copper oxide and zinc oxide nanoparticle formulation as an environmentally friendly wood protectant for the management of wood borer, Lyctus africanus","authors":"K. S. Shiny, R. Sundararaj","doi":"10.4067/S0718-221X2021000100447","DOIUrl":"https://doi.org/10.4067/S0718-221X2021000100447","url":null,"abstract":"The management of Lyctus africanus, one of the major dry wood pests in the tropical region is difficult due to its secluded habits and long lifecycle and therefore, its control measures are limited to the usage of insecticides. The insecticides particularly the metal salts are effective, but in some cases their leaching leads to concerns about environmental pollution. Nanometal particles are found to be more effective than metal salts. Presently available metal nanoparticles are synthesized using physical or chemical methods and their production results in toxic by-products and are costly. The current investigation deals with synthesis and use of metal nanoparticle for wood protection in an environmentally friendly and cost-effective way. The plant extracts that are reported to have wood preservative properties were used for the synthesis of metal nanoparticles. Copper oxide and zinc oxide nanoparticles were synthesized using leaf extracts of Lantana camara. The efficacy of the synthesized Lantana camara leaf extract and copper oxide or zinc oxide nanoparticle formulation as a wood protectant was tested against Lyctus africanus according to standard BIS. The formulation of copper oxide nanoparticle and Lantana camara leaf extract effectively protected the treated rubberwood blocks from Lyctus africanus attack, when compared to zinc oxide nanoparticle Lantana camara leaf extract formulation and can be developed into a stable, ecofriendly wood preservative.","PeriodicalId":18092,"journal":{"name":"Maderas-ciencia Y Tecnologia","volume":"22 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82165679","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}

引用次数: 1

Kinetic analysis of thermal degradation of Cedrela odorata, Marmaroxylon racemosum and Tectona grandis from timber industry 木材工业中香柏木、总状梭梭和大构造木热降解动力学分析

IF 1.5 4区农林科学

Maderas-ciencia Y Tecnologia Pub Date : 2021-07-01 DOI: 10.4067/S0718-221X2021000100446

C. Cavinato, M. Poletto

{"title":"Kinetic analysis of thermal degradation of Cedrela odorata, Marmaroxylon racemosum and Tectona grandis from timber industry","authors":"C. Cavinato, M. Poletto","doi":"10.4067/S0718-221X2021000100446","DOIUrl":"https://doi.org/10.4067/S0718-221X2021000100446","url":null,"abstract":"Thermal analysis is a powerful tool to predict the composition and thermal stability of different materials. In this work, thermogravimetric analysis of Cedrela odorata, Marmaroxylon racemosum and Tectona grandis was carried out at four different heating rates (5 °C·min-1, 10 °C·min-1, 20 °C·min-1 and 40 °C·min-1) in a non-isothermal condition. The degradation kinetics was evaluated based on Flynn-Wall-Ozawa and Criado methods. The half-life time of wood degradation reaction was also studied. The wood thermal degradation process in an oxidizing atmosphere can be divided in dehydration, devolatilization, and combustion. The kinetic results revels apparent activation energy values of 130-240 kJ·mol-1 for Tectona grandis, 150-191 kJ·mol-1 for Marmaroxylon racemosum and 188-205 kJ·mol-1 for Cedrela odorata, when conversion values ranged from 0,1-0,5. The most probable degradation mechanism for wood species studied is a diffusion model based on a three-dimensional diffusion. Cedrela odorata presented the lowest reaction half-life time while Marmaroxylon racemosum showed the highest. On the basis of these results, it can be concluded that Flynn-Wall-Ozawa and Criado methods associated with half-life time of reaction may contribute to better understand the wood degradation before use it in polymer composites.","PeriodicalId":18092,"journal":{"name":"Maderas-ciencia Y Tecnologia","volume":"42 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82590417","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}

引用次数: 1