Literatura científica selecionada sobre o tema "Adhésif biosourcé"
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Artigos de revistas sobre o assunto "Adhésif biosourcé"
AMIROU, Siham. "Développement de polyuréthanes sans isocyanates (NIPUs) biosourcés pour les adhésifs à bois". Matériaux fonctionnels - Matériaux biosourcés, agosto de 2023. http://dx.doi.org/10.51257/a-v1-re408.
Texto completo da fonteTeses / dissertações sobre o assunto "Adhésif biosourcé"
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.
Texto completo da fonteChitosan 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 %
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.
Texto completo da fonteThe 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
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.
Texto completo da fonteThe 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
Santiago-Medina, Francisco José. "Tanins condensés pour mousses rigides et nouvelles réactions de réticulations des matériaux polyphénoliques". Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0248/document.
Texto completo da fonteAn alternative to industrial phenol or resorcinol industrial products may be tannins or lignin. Both are natural polyphenols, the tannin is extracted from different parts of plants, while lignin is usually obtained as a secondary product in the pulp and paper mill. These two products are the main basis on which I have worked during the development of this thesis. In a first part, a study of characterization and differentiation between different tannins with the same origin and that present a different behavior when used in the same application under the same conditions has been done. Highlighting the GPC as a fundamental technique for the differentiation between sulphited quebracho tannins. On the other hand, the interactions between different substances with tannin and with lignin have been studied. As the study of the reaction between diamines (such as hexamethylenediamine) with tannin and lignin to obtain a polycondensed resins. Also, in this section have been obtained polyurethanes with at least 70% of natural substances in their preparation without using any isocyanate in the process. In addition, aldehydes derived from lignin, such as vanillin, have been used next to pine tannin for the manufacture of adhesives in the preparation of particleboards, obtaining satisfactory results according to European standards and from completely natural substances. Finally, within an industrial project the initial steps have been carried out for the development of a rigid tannin foam applicable by projection for the thermal insulation of buildings. Where a new mechanical foaming system has been developed for tannin foams based in fire-fighting foams or in the foams of the tunneling operations, this new system of foaming avoids the problems of shrinkage during the formation of the foam
Wendels, Sophie. "Synthesis and elaboration of new biobased hemostatic adhesives from bacterial polymers". Thesis, Strasbourg, 2021. http://www.theses.fr/2021STRAE006.
Texto completo da fontePolyurethanes (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
Laubé, Florian. "Compréhension des phénomènes physicochimiques régissant l’adhésion et la formulation de vernis à ongles à base de résines biosourcées : approches in silico et in vitro". Electronic Thesis or Diss., Université de Lille (2018-2021), 2019. http://www.theses.fr/2019LILUR014.
Texto completo da fonteSeveral billion nail polishes are sold every year throughout the world, and the market is still fast-growing. Despite a tightening of regulations over the past twenty years, the composition of varnishes remains problematic from an environmental point of view. The main obstacle to reach a 100% bio-based varnish is the secondary film-forming agent, or resin, which provides the additional adhesion, the gloss and the stability that nitrocellulose lacks. In this context, we have focused on understanding the physicochemistry of these complex systems in order to assist the design of new compatible biosourced resins through the establishment of structures-properties relationships. First, complete physicochemical characterizations (surface aspect and surface energy, composition, permeability) were carried out on native nails and two semi-synthetic models. An adhesion test was developed to evaluate the adhesion of formulations onto substrates. Correlated to physicochemical characterizations, these results allowed to identify the best model of the native nail and highlighted the adhesion mechanisms at the varnish-nail interface. In parallel, the "benchmarks" resins were characterized in order to define precise specifications according to their application performances. Thanks to the adaptation of prediction tools to polymers, we managed to link structural modifications to solubility and was validated using synthesized model oligoesters. The impact of some structural features on the gloss or the hardness of resins has been highlighted and the identified structures-properties relationships were confirmed through the evaluation of the performances of new bio-based polyester resins
Laubé, Florian. "Compréhension des phénomènes physicochimiques régissant l’adhésion et la formulation de vernis à ongles à base de résines biosourcées : approches in silico et in vitro". Thesis, Lille 1, 2019. http://www.theses.fr/2019LIL1R014.
Texto completo da fonteSeveral billion nail polishes are sold every year throughout the world, and the market is still fast-growing. Despite a tightening of regulations over the past twenty years, the composition of varnishes remains problematic from an environmental point of view. The main obstacle to reach a 100% bio-based varnish is the secondary film-forming agent, or resin, which provides the additional adhesion, the gloss and the stability that nitrocellulose lacks. In this context, we have focused on understanding the physicochemistry of these complex systems in order to assist the design of new compatible biosourced resins through the establishment of structures-properties relationships. First, complete physicochemical characterizations (surface aspect and surface energy, composition, permeability) were carried out on native nails and two semi-synthetic models. An adhesion test was developed to evaluate the adhesion of formulations onto substrates. Correlated to physicochemical characterizations, these results allowed to identify the best model of the native nail and highlighted the adhesion mechanisms at the varnish-nail interface. In parallel, the "benchmarks" resins were characterized in order to define precise specifications according to their application performances. Thanks to the adaptation of prediction tools to polymers, we managed to link structural modifications to solubility and was validated using synthesized model oligoesters. The impact of some structural features on the gloss or the hardness of resins has been highlighted and the identified structures-properties relationships were confirmed through the evaluation of the performances of new bio-based polyester resins