Letteratura scientifica selezionata sul tema "Biosourced adhesive"
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Articoli di riviste sul tema "Biosourced adhesive"
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Ghahri, Saman, Antonio Pizzi e Reza Hajihassani. "A Study of Concept to Prepare Totally Biosourced Wood Adhesives from Only Soy Protein and Tannin". Polymers 14, n. 6 (13 marzo 2022): 1150. http://dx.doi.org/10.3390/polym14061150.
Testo completoAbstract (sommario):
This is a study of concept on the initial application for wood adhesives totally biosourced from the covalent reaction between soy protein isolate (SPI) and a commercial flavonoid tannin, namely quebracho tannin. The adhesive is composed exclusively of the two vegetable biomaterials mentioned and thus is totally biosourced and non-toxic, as tannin has been classified as being not at all toxic by the European Commission REACH program. The pre-reaction between the two yielded the best plywood bonding results when limited to a temperature of 40 °C, final cross-linking being achieved during the plywood higher temperature hot pressing procedure, as for any other thermosetting adhesive. Pre-reaction at higher temperatures, namely 60 °C and 80 °C, achieved extensive premature cross-linking that lost any activity to cross-link further when hot pressed for preparing plywood. The reaction was followed by thermomechanical analysis, by matrix assisted laser desorption ionization time of flight (MALDI ToF) mass spectrometry, and by plywood shear strength tested dry, after a 24 h cold water soak and 1 h in boiling water. The adhesive of this approach lends itself to be further reinforced by the multitude of approaches on soy resins already developed by several other research groups.
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Abdelmoula, Maisa, Hajer Ben Hlima, Frédéric Michalet, Gérard Bourduche, Jean-Yves Chavant, Alexis Gravier, Cédric Delattre et al. "Chitosan-Based Adhesive: Optimization of Tensile Shear Strength in Dry and Wet Conditions". Polysaccharides 2, n. 1 (28 febbraio 2021): 110–20. http://dx.doi.org/10.3390/polysaccharides2010008.
Testo completoAbstract (sommario):
Commercial adhesives present a high bond strength and water resistance, but they are considered non-healthier products. Chitosan can be considered as an interesting biosourced and biodegradable alternative, despite its low water resistance. Here, its wood bonding implementation and its tensile shear strength in dry and wet conditions were investigated depending on its structural characteristics. Firstly, the spread rate, open assembly time, drying pressure, drying temperature, and drying time have been determined for two chitosans of European pine double lap specimens. An adhesive solution spread rate of 1000 g·m−2, an open assembly time of 10 min, and a pressure temperature of 55 °C for 105 min led to a bond strength of 2.82 MPa. Secondly, a comparison between a high molecular weight/low deacetylation degree chitosan and a lower molecular weight/higher deacetylation degree chitosan was conducted. Tests were conducted with beech simple lap specimens in accordance with the implementation conditions and the conditioning treatments in wet and dry environments required for thermoplastic wood adhesive standards used in non-structural applications (EN 204 and EN 205). The results clearly revealed the dependence of adhesive properties and water resistance on the structural features of chitosans (molecular weight and deacetylation degree), explaining the heterogeneity of results published notably in this field.
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Monteiro, Sandra, Lina Nunes, Jorge Martins, Fernão D. Magalhães e Luísa Carvalho. "Low-Density Cardoon (Cynara cardunculus L.) Particleboards Bound with Potato Starch-Based Adhesive". Polymers 12, n. 8 (11 agosto 2020): 1799. http://dx.doi.org/10.3390/polym12081799.
Testo completoAbstract (sommario):
In the present work, and for the first time, totally biosourced low-density particleboards were produced using cardoon particles (a no added value by-product from the Portuguese cheese making industry), bound with a potato starch adhesive. Different starch/cardoon ratios (0.6, 0.8, 1 and 1.2) were tested and the effect of different bio-based additives (chitosan, wood fiber and glycerol) on the performance of the adhesive system was evaluated. The best result was obtained for a formulation with a starch/cardoon mass ratio of 0.8, a chitosan/starch mass ratio of 0.05 and a water/starch mass ratio of 1.75. The particleboards produced had a density of 323 kg·m−3, internal bond strength of 0.35 N·mm−2 and thickness swelling of 15.2%. The values of density and internal bond strength meet the standard requirements of general-purpose lightweight boards for use in dry conditions according to CEN/TS 16368 specification. Moreover, the susceptibility of the formulations with best results was established against subterranean termites and one decay fungi.
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Pizzi, Antonio, Antonios N. Papadopoulos e Franco Policardi. "Wood Composites and Their Polymer Binders". Polymers 12, n. 5 (13 maggio 2020): 1115. http://dx.doi.org/10.3390/polym12051115.
Testo completoAbstract (sommario):
This review presents first, rather succinctly, what are the important points to look out for when preparing good wood composites, the main types of wood composites manufactured industrially, and the mainly oil-derived wood composite adhesives and binders that dominate and have been dominating this industry. Also briefly described are the most characteristic biosourced, renewable-derived adhesives that are actively researched as substitutes. For all these adhesives, synthetic and biosourced, the reviews expose the considerable progresses which have occurred relatively recently, with a host of new approaches and ideas having been proposed and tested, some even implemented, but with even many more already appearing on the horizon.
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Droesbeke, Martijn A., Alexandre Simula, José M. Asua e Filip E. Du Prez. "Biosourced terpenoids for the development of sustainable acrylic pressure-sensitive adhesives via emulsion polymerisation". Green Chemistry 22, n. 14 (2020): 4561–69. http://dx.doi.org/10.1039/d0gc01350a.
Testo completoAbstract (sommario):
Terpenoid-based (meth)acrylates are introduced in waterborne acrylic pressure-sensitive adhesives via emulsion polymerization. These materials showed good tack, peel strength and shear resistance properties, comparable to a petroleum-based benchmark.
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Ndiwe, Benoit, Antonio Pizzi, Beda Tibi, Raidandi Danwe, Noel Konai e Siham Amirou. "African tree bark exudate extracts as biohardeners of fully biosourced thermoset tannin adhesives for wood panels". Industrial Crops and Products 132 (giugno 2019): 253–68. http://dx.doi.org/10.1016/j.indcrop.2019.02.023.
Testo completo
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Bensabeh, Nabil, Ana Jiménez-Alesanco, Ilme Liblikas, Juan C. Ronda, Virginia Cádiz, Marina Galià, Lauri Vares, Olga Abián e Gerard Lligadas. "Biosourced All-Acrylic ABA Block Copolymers with Lactic Acid-Based Soft Phase". Molecules 25, n. 23 (5 dicembre 2020): 5740. http://dx.doi.org/10.3390/molecules25235740.
Testo completoAbstract (sommario):
Lactic acid is one of the key biobased chemical building blocks, given its readily availability from sugars through fermentation and facile conversion into a range of important chemical intermediates and polymers. Herein, well-defined rubbery polymers derived from butyl lactate solvent were successfully prepared by reversible addition–fragmentation chain transfer (RAFT) polymerization of the corresponding monomeric acrylic derivative. Good control over molecular weight and molecular weight distribution was achieved in bulk using either monofunctional or bifunctional trithiocarbonate-type chain transfer agents. Subsequently, poly(butyl lactate acrylate), with a relative low Tg (−20 °C), good thermal stability (5% wt. loss at 340 °C) and low toxicity was evaluated as a sustainable middle block in all-acrylic ABA copolymers using isosorbide and vanillin-derived glassy polyacrylates as representative end blocks. Thermal, morphological and mechanical properties of copolymers containing hard segment contents of <20 wt% were evaluated to demonstrate the suitability of rubbery poly(alkyl lactate) building blocks for developing functional sustainable materials. Noteworthy, 180° peel adhesion measurements showed that the synthesized biosourced all-acrylic ABA copolymers possess competitive performance when compared with commercial pressure-sensitive tapes.
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Badji, Célia, Ahmed Allal, Jean-Charles Dupin e Frédéric Léonardi. "Impact of Sterilization on the Adhesion Properties of a Polyamide 11 Coating on Textured Metal Substrates". Coatings 14, n. 4 (31 marzo 2024): 424. http://dx.doi.org/10.3390/coatings14040424.
Testo completoAbstract (sommario):
Polyamide materials are widely used for medical device coating. However, despite the fragile area at the interface, these devices must conserve their physical and mechanical performance after the sterilization process. In this work, the impact of steam sterilization, widely used in the medical sector, on the adhesion properties of biocompatible and biosourced polyamide-11-coated copper substrates was assessed. The adhesion strength, a quantitative indicator of the coating performance, was assessed thanks to a laboratory-made bench test. The surface of metal substrates was microstructured with laser engraving to enhance the coating adhesion. The Ra roughness value was varied to verify if the depth of valleys induced with the femtosecond laser could favor the interfacial anchoring. Scanning electron microscopy analyses highlighted the physical surface evolution of the polymer analyzed at the interface, across the various texturing parameter values, Ra. Fourier transform infrared spectroscopy was used to monitor the bands specific to polyamide thermo-oxidative degradation. Elemental composition deduced from X-ray photoelectron spectroscopy carried out on the coating after mechanical debonding clearly revealed that the chemical stability of the copper substrates was affected rather than the polyamide coating. Also, we discussed the impact of the chosen sterilization parameters (steam and pressure) on the formation of copper-based species detected with this technique.
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Bennour, Haythem, Mongia Said Zina e Raouf Medimagh. "Synthesis and characterization of novel organosoluble biosourced poly(ester imide)s based on 1,4:3,6 -dianhydrohexitols suited for adhesives applications". Journal of Adhesion Science and Technology 32, n. 17 (26 marzo 2018): 1886–98. http://dx.doi.org/10.1080/01694243.2018.1453227.
Testo completo
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Awad, Mohamed M., Turki Alshehri, Ahmed M. Alqarni, Nashaat M. Magdy, Feras Alhalabi, Dalal Alotaibi e Ali Alrahlah. "Evaluation of the Bond Strength and Cytotoxicity of Alkasite Restorative Material". Applied Sciences 10, n. 18 (4 settembre 2020): 6175. http://dx.doi.org/10.3390/app10186175.
Testo completoAbstract (sommario):
Cention N (CN; Ivoclar Vivadent, Schaan, Liechtenstein), advertised as an alkasite, is a bioactive bulk-fill resin-based composite (BF-RBC) with alkaline fillers. This study evaluated the resin-dentin micro-tensile bond strength (μTBS) and cytotoxicity of CN. Methods: Flat dentin surfaces were obtained, bonded with a universal adhesive, and randomly distributed into two groups. CN (group I) and a flowable BF-RBC, namely, Tetric N-Flow Bulk Fill, Ivoclar Vivadent, Schaan, Liechtenstein (group II), were used. After thermocycling, bonded samples were sectioned into micro-beams for μTBS evaluation. Resin-based composite (RBC) discs with a thickness of 2 and 4 mm were tested on human gingival fibroblast cells (HGFCs). Cytotoxicity was assessed by cell viability and growth using AlamarBlue® (Biosource, Camarillo, CA, USA) over a seven-day period. Independent t-test was utilized to statistically analyze μTBS data, while one- and two-way analysis of variance (ANOVA) and Tukey’s post-hoc tests were utilized to analyze the cell viability data. Results: There was no statistically significant difference (p > 0.05) in the μTBS between the flowable BF-RBC and CN. For both materials, the HGFCs were viable, with constant growing over the seven-day period. Conclusion: CN provided a resin-dentin μTBS that was comparable to that provided by the flowable BF-RBC. Both materials showed acceptable cytotoxicity over the seven-day period at a thickness of both 2 and 4 mm.
Tesi sul tema "Biosourced adhesive"
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Silvestre, Jeanne. "Mise en œuvre de chitosanes fonctionnalisés dans la formulation d'adhésifs structuraux à destination de la filière bois". Electronic Thesis or Diss., Université Clermont Auvergne (2021-...), 2024. http://www.theses.fr/2024UCFA0031.
Testo completoAbstract (sommario):
Le chitosane est un polysaccharide cationique biosourcé largement utilisé dans différents domaines tels que la santé, le traitement des eaux usées ou les compléments alimentaires. Un autre champ applicatif de ce polymère correspond au domaine des adhésifs. En effet, la demande actuelle visant à remplacer les polymères non naturels et toxiques par des polymères plus « verts » et plus sains est fortement présente dans le milieu des adhésifs et ouvre d'intéressantes opportunités au chitosane et à ses dérivés. Cependant, le chitosane est insoluble dans l'eau (à des pH > 7) et présente une résistance faible à l'eau lorsqu'il est utilisé comme adhésif. Cette constatation limite ses possibilités d'utilisation dans le domaine du collage.Des études ont été menées sur différents chitosanes industriels afin de sélectionner ceux présentant les caractéristiques physico-chimiques les plus attrayantes pour un usage en tant qu'adhésif. Ensuite, le chitosane a été chimiquement modifié par des réactions de réticulation covalente et plastifié afin d'améliorer les propriétés mécaniques de joints adhésifs à base de chitosane sur le bois en milieu humide. Un adhésif à base de chitosane présentant une résistance au cisaillement supérieure à 4 MPa sur éprouvettes humides a été obtenu avec l'ajout de glycérol diglycidyl éther avec un ratio massique glycérol diglycidyl éther/chitosane de 20 %Chitosan is a cationic bio-sourced cationic polysaccharide widely used in different fields from health to wastewater treatment through food supplements. Another important use of this polymer is adhesion. Indeed, the current demand to replace non-natural and toxic polymers by greener ones is well present in the adhesive field and open good opportunities for chitosan and its derivatives. However, chitosan is not water soluble (at pH ≥ 7) and exhibits a poor water-resistance in the field of adhesion which reduces the possibilities of its utilization within the paste field.Studies have been carried out to identify commercial chitosans with the most promising characteristics as adhesive. Then, chitosan has been chemically modified by covalent crosslinking reaction and plasticizing to improve its mechanical resistance for wood bonding in presence of water. A chitosan-based adhesive with a shear resistance higher than 4 MPa on wet samples has been obtained by adding glycerol diglycidyl ether with a weight ratio glycerol diglycidyl ether/chitosan of 20 %
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Casenave, Clémence. "Caractérisations physico-chimique des tourteaux protéagineux et leur modification chimique pour une application adhésive". Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0114.
Testo completoAbstract (sommario):
Ces travaux de thèse en collaboration avec la société Evertree visent à mieux comprendre le caractère adhésif des tourteaux protéagineux. Afin de remplacer les colles à base de formaldéhyde dans l'industrie du bois, des alternatives biosourcées sont développées. De nombreuses colles végétales à partir de tourteaux de soja ont été développées aux Etats-Unis, mais cette culture est moins présente en Europe, contrairement au colza et au tournesol. Ainsi, la société Evertree valorise les tourteaux de colza et de tournesol au sein de formulations adhésives pour le bois. Cependant, le caractère adhésif de ces matières végétales n’est pas encore totalement compris. Il est acquis par la littérature que ce potentiel adhésif des tourteaux est relié à leur composition en protéines. Néanmoins, cette hypothèse n’a pas clairement été confirmée. Ainsi, les travaux de cette thèse ont concerné principalement le tourteau de tournesol et ont confirmé le caractère adhésif de sa composante protéique. Ils ont mis en avant les globulines comme étant la famille protéique responsable de l'activité adhésive. Enfin les paramètres structuraux des protéines ont également été étudiés, afin d'analyser leur rôle sur les paramètres adhésifs du tourteau de tournesolThe aim of this thesis, in collaboration with Evertree, is to gain a better understanding of the adhesive properties of protein meals. In order to replace formaldehyde-based adhesives in the wood industry, biosourced alternatives are being developed. Many vegetable glues based on soybean meal have been developed in the United States, but this crop is less common in Europe, unlike rapeseed and sunflower. Evertree, for example, uses rapeseed and sunflower meal in adhesive formulations for wood. However, the adhesive nature of these plant materials is not yet fully understood. The literature suggests that the adhesive potential of meals is linked to their protein composition. However, this hypothesis has not been clearly confirmed. The work in this thesis focused mainly on sunflower meal and confirmed the adhesive nature of its protein component. It highlighted globulins as the protein family responsible for adhesive activity. Finally, the structural parameters of the proteins were also studied, in order to analyse their role in the adhesive parameters of sunflower meal
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Darroman, Emilie. "Elaboration de polymères biosourcés pour application dans un matériau composite à base de farine de liège". Thesis, Montpellier, Ecole nationale supérieure de chimie, 2014. http://www.theses.fr/2014ENCM0018.
Testo completoAbstract (sommario):
Les travaux présentés concernent le développement d'un matériau composite (farine de liège, liant et additif) pour l'élaboration de bouchons technologiques mis en œuvre par un procédé de moulage. Dans le cadre de ces travaux, la synthèse, la caractérisation et la formulation d'un polymère biosourcé ont été développées en tant que liant de ce matériau composite. La stratégie de cette thèse a été de développer un polymère obtenu par polycondensation d'un composé époxydique avec un agent réticulant de type amine. Dans un premier temps, une caractérisation approfondie du liant utilisé par DIAM Bouchage a été réalisée pour définir le cahier des charges du nouveau polymère. L'étude de composés époxydiques et amines ont permis de sélectionner des précurseurs commerciaux biosourcés et non-classés CMR qui répondent au cahier des charges. De nouveaux précurseurs époxydiques et amines ont été synthétisés à partir de bioressources telles que la vanilline et les dérivés d'acide gras. La synthèse de résines époxy-amines a été effectuée grâce aux précurseurs commerciaux sélectionnés et ces résines ont été caractérisées thermiquement, mécaniquement et physiquement. Finalement, des bouchons technologiques ont été synthétisés selon différentes formulations et caractérisés pour évaluer leur adéquation avec les spécifications de DIAM BouchageThe presented study concerns the development of a composite material (cork flour, binder and additive) in order to produce of technological cork-stoppers carried out by a molding process. As part of this work, the synthesis, the characterization and the formulation of a biobased polymer have been developed as a binder of the composite material. The strategy of this thesis was to develop a polymer obtained by polycondensation of an epoxy compound with an amine curing agent.As a first step, a thorough characterization of the binder used by DIAM Bouchage was carried out to define the specifications of the novel polymer. The study of epoxy and amine compounds led to the selection of biobased commercial and non-classified CMR precursors that meet the specifications. Novel epoxy and amine precursors were synthesized from biobased resources such as vanillin and fatty acid derivatives. The synthesis of epoxy-amine resins was performed with the selected commercial precursors and these resins were characterized thermally, mechanically and physically. Finally, different formulations of technological cork-stoppers were synthesized and characterized to evaluate their suitability with the DIAM Bouchage specifications
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Wendels, Sophie. "Synthesis and elaboration of new biobased hemostatic adhesives from bacterial polymers". Thesis, Strasbourg, 2021. http://www.theses.fr/2021STRAE006.
Testo completoAbstract (sommario):
Les polyuréthanes (PU) sont une des principales familles de polymères démontrant des propriétés variées pour de multiples applications. Ces propriétés leurs ont permis d’être utilisés dans le domaine du biomédical depuis des décennies. Avec le développement actuel de nombreuses molécules issues de la biomasse, les possibilités d’innovation dans les matériaux biosourcés sont multiples. Aujourd’hui, des PUs aux propriétés avancées sont développés. Cependant, il y a toujours un manque de solutions plus respectueuses de l’environnement et efficaces comme adhésifs hémostatiques. Ainsi, ce travail a porté sur l’élaboration d’une nouvelle série d’adhésifs biosourcés PU à partir de différentes biomasses telles que les polymères bactériens et les huiles végétales, mais pas seulement. Plusieurs séries d’adhésifs ont été préparées et caractérisées, et proposent une large gamme de propriétés spécifiques aux adhésifs tels que la viscosité, le temps de réaction, l’adhésion tissulaire et l’éxothermie. De plus, des systèmes correspondant à l’état chimique final des adhésifs au contact des tissus ont été préparés et caractérisés. Selon la formulation, les propriétés physico-chimiques, thermiques et mécaniques peuvent être adaptées à différents tissus. La cytotoxicité et la dégradation, qui sont des paramètres clés pour une utilisation dans le biomédical, ont également été évaluéesPolyurethanes (PUs) are a major family of polymers used in a large range of fields. Moreover, they display a wide spectrum of physico-chemical, mechanical and structural properties. In this regard, they have shown suitable for biomedical applications and are used in this domain since decades. The current variety of biomass available has extended the diversity of starting materials for the elaboration of new biobased macromolecular architectures, allowing the development of biobased PUs with advanced properties. Nowadays, there is a need for more environmentally friendly and effective solutions for tissue adhesive purposes. In this frame, new renewably sourced PU-based hemostatic adhesives have been successfully designed. Chosen biomasses were mainly from bacterial ressources and vegetable oils, but not only. Many different adhesive formulations were obtained and characterized, and the developed adhesives offer a broad range of specific properties such as viscosity, curing time, tissue adhesion and exothermy. PUs, corresponding to the final adhesives chemical state in contact with the tissue, were also prepared and studied. They exhibited tailored physico-chemical, thermal and mechanical properties, close to diverse tissue native mechanical properties. Cytotoxicity and degradation, which are key parameters for biomedical applications, were also investigated
Capitoli di libri sul tema "Biosourced adhesive"
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Pizzi, Antonio, e Anish Khan. "Furanic Rigid Foams, Furanic-Based Bioplastics and Furanic-Derived Wood Adhesives and Bioadhesives". In Furans and Furan Derivatives - Recent Advances and Applications [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.101200.
Testo completoAbstract (sommario):
In this chapter, we discuss pure furanic foams and tannin-furanic foams as fire-resistant, environmentally friendly, rigid biofoams. We also examine furanic wood adhesives in which a major furan portion is coupled with either synthetics or bioadhesives. In the case of furanic wood bioadhesives, the formulations developed were 90–100% biosourced. Equally, furanic rigid plastics of considerable mechanical resistance have also been developed and applied to angle-grinder discs and automotive brakes with very encouraging results.