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Feasibility Study of the Synthesis of Isocyanate-Free Polyurethanes from Catechin

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Journal of Renewable Materials 2022年第5期10卷 1175-1184页

作者： Wissem Sahmim Febrina Dellarose Boer Hubert Chapuis Firmin Obounou-Akong antonio pizzi Philippe Gérardin Christine Gérardin-Charbonnier Facultédes Sciences et Technologies Laboratoire d’Etudes et de Recherche sur le Matériau BoisEA 4370-USC INRAEUniversitéde LorraineNancy54506France Laboratoire d’Etudes et de Recherche sur le Matériau Bois EA 4370-USC INRAEUniversitéde LorraineEpinal88000France

With the current trend of increasing efforts to develop non-isocyanate-based polyurethanes(NIPUs),this study aimed to check the feasibility of the development of a method using cyclic carbonate modified catechin and amine to synthesis non-isocyanate urethane with the objective to further extend these results to polyurethane *** methods used in this study consist of four steps:glycidilation of catechin,hydrolysis of epoxide,cyclic carbonate synthesis,and carbamate synthesis through condensation of *** resulting products were analyzed using FTIR(Fourier transform infrared)spectroscopy and NMR(nuclear magnetic resonance)*** results showed that carbamate could be successfully obtained through this four-steps synthesis,opening the possibility to further developments for the synthesis of polyurethanes starting from catechin and condensed tannins.

关键词： Catechin cyclic carbonate isocyanate-free glycidilation carbamate

Modification of Wood by Tannin-Furfuryl Alcohol Resins-Effect on Dimensional Stability,Mechanical Properties and Decay Durability

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Journal of Renewable Materials 2023年第2期11卷 505-521页

作者： Mahdi Mubarok Christine Gérardin-Charbonnier Elham Azadeh Firmin Obounou AkongStéphane Dumarçay antonio pizzi Philippe Gérardin Universitéde Lorraine INRAEUR 4370 USC 1445 LERMABFacultédes Sciences et TechnologiesNancyFrance 2 Forest Product Sciences and TechnologyFaculty of Forestry and EnvironmentIPB UniversityBogorIndonesia

Furfurylation is a well-known wood modification *** paper studied the effect of tannin addition on the wood *** kinds of dicarboxylic acids,adipic acid,succinic acid,and tartaric acid,as well as glyoxal as a comparing agent,were used to catalyse the polymerisation of furanic or tannin-furanic solutions during wood *** of furanic or tannin-furanic solution at a certain concentration into the wood followed with curing at 103℃for a specific duration was performed for the wood *** properties of the modified woods like dimensional stability,resistance of treatment to leaching,mechanical properties,decay durability against white-rot(Coriolus versicolor,Pycnoporus sanguineus)and brown-rot(Coniophora puteana)as well as their chemical and anatomical characteristics were *** revealed that the partial substitution of FA by the tannins improved the fixation of the chemicals impregnated in ***,dimensional stability,leaching resistance,Brinell hardness,modulus of elasticity/modulus of rupture,and decay durability properties of the furfurylated wood were also improved in the presence of *** electron microscopy revealed the deposition of the polymer in the wood lumen cells and in the wood cell walls.

关键词： Decay durability furfuryl alcohol leaching resistance mechanical properties tannin

Performance of Unidirectional Biocomposite Developed with Piptadeniastrum Africanum Tannin Resin and Urena Lobata Fibers as Reinforcement

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Journal of Renewable Materials 2021年第3期9卷 477-493页

作者： Achille Gnassiri Wedaïna antonio pizzi Wolfgang Nzie Raidandi Danwe Noel Konaï Siham Amirou Cesar Segovia Raphaël Kueny Laboratory of Mechanics Materialsand Modelization(PAI)University of NgaoundéréNgaoundéré454Cameroon Laboratory of Studies and Research on Wood Material(LERMAB) University of LorraineEpinal88000France Laboratory of Mechanics Materials and BuildingUniversity of MarouaMarouaCameroon Laboratory of Materials Mechanics University of Yaoundé1Yaoundé8390Cameroon Lorrain Textile Test Center(CETELOR) University of LorraineEpinal88026France

The Piptadeniastrum Africanum bark tannin extract was characterized using MALDI TOF,ATR-FT *** was used in the development of a resin with Vachellia nilotica extract as a *** tannin is consisting of Catechin,Quercetin,Chalcone,Gallocatechin,Epigallocatechin gallate,Epicatechin *** gel time of the resin at natural pH(pH=5.4)is 660 s and its MOE obtained by thermomechanical analysis is 3909 *** tenacity of Urena lobata fibers were tested,woven into unidirectional mats(UD),and used as reinforcement in the development of *** fibers tenacity at 20,30 and 50 mm lengths are respectively 65.41,41.04 and 33.86 cN·Tex^(−1).The UD biocomposite obtained had very interesting mechanical *** density,tensile MOE,ultimate strength,bending MOE and MOR are respectively 926 kg·m^(−3),6 GPa,55 MPa,9.3 GPa and 68.3 *** biocomposite can be used in a building exterior structure.

关键词： Adhesive biocomposite fibers hardener MOE and MOR

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木材焊接技术(无胶胶合)的研究进展

中国胶粘剂 2014年第6期23卷 47-53页

作者：周晓剑 antonio pizzi 杜官本西南林业大学云南省木材胶粘剂及胶合制品重点实验室云南昆明650224 洛林大学法国88051

介绍了木材焊接技术的原理、优点,着重综述了木材焊接(线性摩擦焊接、旋转摩擦焊接)的影响参数、焊接过程因素(如温度、化学反应和挥发物等)的影响、耐水性改进及其应用开发。最后就木材焊接技术所存在的问题对未来相关产品的性能、尺... 详细信息

介绍了木材焊接技术的原理、优点,着重综述了木材焊接(线性摩擦焊接、旋转摩擦焊接)的影响参数、焊接过程因素(如温度、化学反应和挥发物等)的影响、耐水性改进及其应用开发。最后就木材焊接技术所存在的问题对未来相关产品的性能、尺寸、种类及适用领域提出设想。

关键词：木材焊接无胶胶合线性摩擦焊接旋转摩擦焊接影响参数

云南松树皮单宁树脂砂轮切割片的制备及性能研究

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化工新型材料 2016年第6期44卷 252-254页

作者：张俊杜官本邓书端 pizzi antonio 王辉北京林业大学材料科学与技术学院北京100083 法国洛林大学ENSTIB epinal88000 西南林业大学云南省木材胶黏剂及胶合制品重点实验室昆明650224

以云南松单宁和糠醇为主要原料,氧化铝颗粒为研磨材料,在实验室条件下制备新型可回收砂轮切割片来替代工业酚醛树脂砂轮切割片。同时对材料的抗压、抗弯性能,布氏硬度及切割性能进行了研究。结果表明:按同一工艺制备的单宁树脂砂轮切割... 详细信息

以云南松单宁和糠醇为主要原料,氧化铝颗粒为研磨材料,在实验室条件下制备新型可回收砂轮切割片来替代工业酚醛树脂砂轮切割片。同时对材料的抗压、抗弯性能,布氏硬度及切割性能进行了研究。结果表明:按同一工艺制备的单宁树脂砂轮切割片的抗压、抗弯性能及硬度均高于酚醛树脂砂轮切割片,并且二者的切割性能相似。因此,采用天然可回收云南松单宁树脂砂轮切割片来替代石油产物酚醛树脂砂轮切割是可行的。

关键词：单宁树脂氧化铝颗粒力学性能切割性能

乙二醛-尿素树脂提高脲醛树脂固化速率和性能的研究

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中国胶粘剂 2016年第5期25卷 1-5,13页

作者：邓书端汪进杜官本 pizzi antonio 云南省木材胶粘剂与胶接制品重点实验室西南林业大学云南昆明650224 洛林大学埃皮纳勒f88000

在酸性介质中合成了一种无F(甲醛)的环保型GU(乙二醛-尿素树脂),并探讨了其用作UF(脲醛树脂)固化剂的可行性。研究结果表明:GU含有共轭结构、大量的氨基和羟基等活性基团,并且其Mr(相对分子质量)分布较宽且比较零散,主要以加成产物和低... 详细信息

在酸性介质中合成了一种无F(甲醛)的环保型GU(乙二醛-尿素树脂),并探讨了其用作UF(脲醛树脂)固化剂的可行性。研究结果表明:GU含有共轭结构、大量的氨基和羟基等活性基团,并且其Mr(相对分子质量)分布较宽且比较零散,主要以加成产物和低聚物为主;当m(GU)∶m(UF)=5∶95时,不另加固化剂而制备的胶合板之干态胶接强度和F释放量,均满足GB/T 9846.3—2004标准中的指标要求。

关键词：木材胶粘剂乙二醛-尿素树脂脲醛树脂固化剂甲醛释放量

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

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Journal of Renewable Materials 2023年第3期11卷 1077-1099页

作者： Jean Jalin Eyinga Biwôlé Achille Bernard Biwolé antonio pizzi Joseph Zobo Mfomo César Segovia Atangana Ateba Evariste Fedoung Fongnzossie Sahbi Ouertani Xinyi Chen Bénoît Ndiwe DieudonnéAbessolo Pierre-Jean Meausoone Laboratory of Forest Resources and Wood Valorization University of DoualaP.O.Box.2701DoualaCameroon Laboratory of Mechanics University of DoualaP.O.Box.2701DoualaCameroon CETELOR University of LorraineP.O.Box.21042EpinalFrance ENSTIB-LERMAB University of LorraineP.O.Box.21042EpinalFrance Laboratory of Energetics and Thermal and Mass Transfers El Manar University of TunisTunisTunisia

Wood plays a major role in the production of furniture and wooden ***,in this process,the massive use of adhesives and plural connectors remains a definite problem for health and the ***,wood welding is a breakthrough in this *** paper reviews the applications of wood welding in furniture and construction and then examines advances in improving the durability of welded wood against *** contribution also highlights the need to join African tropical woods using the rotational friction welding *** to our results,these woods present interesting chemical singularities,which could provide solutions to the water vulnerability of the welded ***,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 *** works enrich the long and rich bibliography on the technique of wood welding,which has long been conspicuous by its absence of tropical woods.

关键词： Wood welding tropical woods water vulnerability chemical singularities natural durability

Characteristics and Mechanicals Potentials of Wood Adhesives Manufactured with Grasses’ Lignins

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Journal of Materials Science and Chemical Engineering 2019年第1期7卷 35-47页

作者： Lionel Tapsia Karga Danwe Raidandi Noel Konai antonio pizzi Lucien Meva’a Laboratory of Mechanics and Civil Engineering National Advanced School of Engineering University of Yaoundé 1 Yaoundé Cameroon Department of Mechanical Engineering Petroleum and Gas Faculty of Mines and Petroleum Industries University of Maroua Kaélé Cameroon Departement of Mechanical Engineering and Materials National Advanced School of Engineering University of Maroua Maroua Cameroon ENSTIB-LERMAB University of Lorraine Epinal France

In order to manufacture environmentally friendly particle boards and enhance local resources, the lignins of Sorghum bicolor and Andropogon gayanus characterized using RMN 13C and MALDI TOF have the same structures. They contents Guaiacyl (G), Syringyl (S), p-hydroxyphenylpropane (H) and functional groups of phenols, flavonoids and secondary alcohols. The total phenol content determinated using Folin-Ciocalteu reagent is respectively 20.97 and 15.42 mg eqgallic acid/g of extract. The power of their adhesives is different. The Internal Bond (IB) of particleboards manufactured with these adhesives are respectively 0.37 MPa and 0.41 MPa. These lignins can be used as antioxydants.

关键词： Lignins Sorghum bicolor and Andropogon gayanus Structures Adhesives Internal Bond Antioxydants

Characterization of Tannin-Based Resins from the Barks of <i>Ficus platyphylla</i>and of <i>Vitellaria paradoxa</i>: Composites’ Performances and Applications

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Materials Sciences and Applications 2017年第12期8卷 899-917页

作者： Richard Ntenga Frederic Djoda Pagore antonio pizzi Etienne Mfoumou Louis-Max Ayina Ohandja Laboratoire de Mécanique et Productique (LMP) UFD SI Université de Douala Douala Cameroun Laboratoire d’Analyse Simulations et Essais (LASE) IUT Université de Ngaoundéré Ngaoundere Cameroun ENSTIB-LERMAB Nancy University 27 rue du Merle Blanc Epinal France Department of Physics King Abdulaziz University Jeddah KSA Applied Research & Innovation Nova Scotia Community College Dartmouth Canada Laboratory of Materials Mechanics Structures and Integrated Manufacturing National Advanced School of Engineering University of Yaoundé 1 Yaoundé Cameroon

This work investigates the physico-chemical and mechanical properties of tannins extracted from wood for composite materials manufacturing. Sustainable knowledge (in terms of physico-chemical properties and behaviours) of the material is needed to further enhance its applications. The condensed tannins extracted from the Bark of Ficus platyphylla (BFP) and the Bark of Vitellaria paradoxa (BVP) were analyzed using Matrix Assisted Laser Desorption/Ionization Time-Of-Flight (MALDI-TOF), Mass Spectroscopy and Attenuated Total Reflectance Fourier Transform Mid-InfraRed (ATR-FT MIR) spectra in the ranges 1800 cm-1 and 600 cm-1, as well as using CP MAS 13C-NMR. It was found that, these two tannins are procyanidin/prodelphinidin and made up of catechin/epicatechin, gallocatechin/epigallocatechin units, fisetinidin, galloyl and carbohydrates residues. Furthermore, BFP and BVP tannin bonded particleboard densities lie in the range recommended by NF EN 326-1994 standard. The resins also yielded good internal bond strength results of the panels, above relevant international standard specifications minimum requirements for interior-grade panels. The Transmission Electron Microscopy with Energy Dispersive X-ray Spectroscopy Analysis (TEM/ EDXA) are showing the ultrastructure and reveal that most of the resin material appears to be in an amorphous phase mainly composed of carbon/oxygen with small amounts of K, Ca and Mg. These particles have a very irregular morphology.

关键词： Wood Condensed Tannins Fibre/Matrix Bond Mechanical Properties Active Correlated Transmission Electron Microscopy (ACTEM) Matrix Assisted Laser Desorption/Ionization Time-Of-Flight (MALDI-TOF)