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Добірка наукової літератури з теми "Esters de Glycérol"
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Статті в журналах з теми "Esters de Glycérol"
Khemis, A., S. Desjonqueres, and A. Kelati. "L’évaluation du gel TGO (tri-ester de glycérol oxydé) pour la prévention et le traitement symptomatique de la chéilite chez des patients acnéiques traités par isotrétinoïne : étude pilote multicentrique." Annales de Dermatologie et de Vénéréologie 144, no. 12 (December 2017): S343. http://dx.doi.org/10.1016/j.annder.2017.09.586.
Повний текст джерелаДисертації з теми "Esters de Glycérol"
Abdel, Baki Zaher. "Esters carboniques oléochimiques simples ou complexes co-formulants des agromatériaux." Phd thesis, Toulouse, INPT, 2015. http://oatao.univ-toulouse.fr/18664/1/ABDEL_BAKI.pdf.
Повний текст джерелаSuárez, Palacios Oscar Yesid. "Production et modélisation de glycérol-esters comme plastifiants pour le PVC." Thesis, Vandoeuvre-les-Nancy, INPL, 2011. http://www.theses.fr/2011INPL048N/document.
Повний текст джерелаPhtalates are the most important plasticizers used in the polymer industry. However, their fossil origin and results of recent test have showed a potential negative effect on human health, have encouraged polymer industry to demand free phthalate plasticizers. At the same time, biodiesel industry produces a glut of glycerol, leading the scientific community to seek new applications for this substance. A methodology for the evaluation of new free-phthalate plasticizers for PVC applied to a new type of plasticizers, esters of glycerol, is proposed. This thesis presents an overview of the performance of eight esters derived from glycerol as new plasticizers for poly(vinyl chloride) - PVC and an outline of its compatibility with the polymer based in a method to predict the plasticization effect of glycerol esters, constructed with molecular modeling.Having several alternatives of new PVC-plasticizers, three multicriteria methods were used to construct models to select the best alternatives: multiattribute utility theory - MAUT, Measuring Attractiveness by a Categorical Based Evaluation Technique - Macbeth and Rough sets. With these methods the preferences of a group of experts was modeled.In order to establish the conditions in which this new type of plasticizers must be produced at industrial scale, a model of the process is presented. A parametric identification was done. Also, a multicriteria optimization, in Pareto’s sense, was performed using an evolutionary algorithm. Besides, a decision aid tool based on two different functions to minimize costs and maximize productivity, respectively, was conducted with the technique Macbeth
Pelet, Sandrine. "Valorisation du glycérol à travers l'étude de la réactivité chimique du carbonate de glycérol : nouvelles voies de synthèse des esters de carbonate de glycérol et propriétés." Toulouse, INPT, 1999. http://www.theses.fr/1999INPT007C.
Повний текст джерелаDargelos, Marianne. "Valorisation du glycérol : synthèse de l'épibromhydrine." Toulouse, INPT, 1992. http://www.theses.fr/1992INPT020G.
Повний текст джерелаBancquart, Sébastien. "Réactions de transestérification sélective du glycérol en présence de catalyseurs mésoporeux basiques." Poitiers, 2002. http://www.theses.fr/2002POIT2287.
Повний текст джерелаThe oleochemistry processes lead to an increasing amount of glycerol, that must be valorised, for example as monoesters, low toxic and biodegradable surfactans. They are synthesized by transesterification with methyl esters. Homogeneous catalysts lead to to a mixture of monoand polyglycerides and of several side products, (polyglycerols or acroleine). The use of basic solid catalysts such as MgO leads to similar results. MCM-41 mesoporous solids impregnated with Mg salts catalyse the reaction. The catalyst and the reaction conditions were optimised. So supports with (100) interreticular distance between 3. 4 and 6. 9 nm were synthesized and induce shape selectivity. According to the kinetic study, the best catalyst increases the speed of the glycerol transesterification 2. 7 more times than its of the second transesterification. These catalysts allow the direct and selective synthesis of monoglycerides
Vanhove, Céline. "Réactions de transestérification sélective du glycérol par des esters méthyliques en présence d'oxydes basiques." Poitiers, 1999. http://www.theses.fr/1999POIT2340.
Повний текст джерелаBouillaud, Alain. "Valorisation chimique du glycérol : approche du procédé de synthèse de l'épibromhydrine." Toulouse, INPT, 1995. http://www.theses.fr/1995INPT007G.
Повний текст джерелаVerdier, Thomas. "Elaboration de revêtements pour matériaux de construction visant à lutter contre la prolifération microbienne à l'intérieur des bâtiments : efficacité et mode d'action." Thesis, Toulouse 3, 2015. http://www.theses.fr/2015TOU30191/document.
Повний текст джерелаThis work is included in a health-related context: the degradation of the indoor air quality induced by the presence of microorganisms. In damp environments, indoor building materials are among the main proliferation substrates for microorganisms. Photocatalysis is a decontamination process which is active against a wide range of organic pollutants (aqueous, gaseous or biological). The principle is based on the excitation of a photocatalyst by light irradiation, usually located in the UV-range, which leads to the degradation or mineralization of surrounding pollutants through a series of oxidative reactions. The most common photocatalyst is titanium dioxide (TiO2). In addition to produce aggressive redox species, the illuminated TiO2 also shows super-hydrophilicity, which has an impact on the first step of microbial biofilm formation: the adhesion of microorganisms. Another technology to protect indoor building materials is explored: the use of glycerol esters, which are bio-based molecules with inherent antimicrobial properties. The main objective of this study is to develop semi-transparent coatings for indoor building materials and to study the resistance to microbial growth conferred by these passive devices, which are formulated using TiO2 nanoparticles or glycerol esters. Initially, the development and implementation of experimental devices has been necessary to adapt microbiological evaluation methods to these particular materials (nanoparticles, surface coatings, cementitious materials). Thus, several tests have been carried out in order to assess the antimicrobial performances in terms of (i) antibacterial activity, (ii) bactericidal effect, (iii) resistance to biofilm formation and (iv) resistance to proliferation by "natural" contamination. First tests aimed to underline the influence of methodological parameters on the efficiency of TiO2 particles used alone as antimicrobial agent. Then, semi-transparent coatings were formulated on the basis of previous works which have shown good efficiencies on the depollution of ambient air from NOx, NO and VOC. Once the parameters that influence TiO2 activity were identified, coatings were tested in optimum conditions. The evaluation of the resistance to biofilm formation shows the importance of overlapping different microbiological evaluation methods (e.g. CFU counting and epifluorescence observations). The last part was an exploratory work on the antimicrobial properties of a glycerol ester molecule, by-product from the synthesis of biofuels. The molecule shows potent antibacterial and bactericidal properties, several log of inactivation within only few minutes of contact. It also provides very effective protection against microbial growth once covered on building materials (plasterboard). These remarkable performances encourage further studies on this molecule
Al, Hallak Mohamad. "Etude de la contamination fongique de l'air et des matériaux et de l'aérosolisation pour l'amélioration de la qualité de l'air intérieur." Electronic Thesis or Diss., Université de Toulouse (2023-....), 2024. http://www.theses.fr/2024TLSES011.
Повний текст джерелаIndoor air pollution is an important cause of diverse health problems for occupants including respiratory diseases, allergic symptoms, cancers, and cardiovascular problems. People spend 80-90% of their time indoors emphasizing the importance of understanding the main causes of indoor air pollution and finding suitable solutions to improve indoor air quality. The World Health Organization (WHO) reported in 2009 that biological pollution is one of the main causes of the degradation of indoor quality. In humid indoor environments, fungi can grow and develop on almost all building materials. Upon their development on surfaces, they produce particles such as spores, toxins or volatile organic compounds, and other metabolites that can be aerosolized. The release of particles from surfaces as well as their characteristics is dependent on different factors including the type and age of microorganisms on the surface, material properties, and environmental conditions (temperature, humidity, air velocity). Based on their sizes and their duration of availability in the indoor air, they can be inhaled by occupants, leading to serious health risks as they may penetrate different depths in the respiratory system. To respond to these issues, this work aimed to investigate the relations that may exist between microorganisms, especially fungi, present on surfaces and airborne particles contaminating the indoor air (In situ and in the lab). It would provide a clearer vision of fungal contamination in the indoor environment and would be helpful during investigating methods for controlling the growth of fungi indoors. In addition, investigations on the performances of selected photocatalysts and glycerol esters as antimicrobial products for reducing microbial contamination on surfaces in the laboratory were achieved. Initially, an In situ sampling campaign was held in a visibly contaminated house in Southern France. Surface sampling from contaminated materials and indoor airborne sampling were carried out. Then, DNA analysis for samples was carried out by Toulouse Biotechnology Institute (TBI). This part aimed to check the relationship, if any, between fungal contamination on surfaces and airborne contamination. Then, experiments on the antifungal and antibacterial activities of photocatalytic products and the antifungal activity of glycerol esters were carried out under different experimental conditions. This part aimed to test their efficiency as antibacterial/antifungal products that may be applied as additives in paints or coatings. The tests carried out in this part were preliminary tests in aqueous solutions and the impact of different conditions on the efficiency of each product was evaluated. The efficiency of three photocatalysts (TiO2, ZnO, Au-decorated ZnO) as antimicrobial products under light intensities close to real-life indoor conditions. The efficiencies of Undecylenic Acid (UA) and of three glycerol esters, formed upon esterification of Glycerols with UA, as antifungal products were evaluated. The last part of this study aimed to investigate the relationship between surface contamination and airborne contamination under controlled conditions (mainly airflow and relative humidity). A new experimental device was settled, design and validation of an experiment protocol that permit to determine the quantitative correlation between surface contamination and airborne contamination were carried out. The impact of different experimental parameters on the aerosolization of particles from contaminated surfaces into air was evaluated. The validation of this experimental protocol was important and brought attention to different tests that will be investigated in the near future
Sutter, Marc. "Nouvelles méthodes d'accès aux éthers de glycérol." Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10207/document.
Повний текст джерелаIn recent years, sustainable development brought unprecedented changes in industrial and academic researches. The use of raw materials from renewable resources is one of the most outstanding aspects of these changes. The development of original processes, with recyclable catalytic systems, new chemical transformations as well as new solvents with a lower environmental impact are of growing interest, because of environmental and economical profits. The research work described in this thesisis focused on the development of new accesses to glyceryl ethers as high value added coumpounds.Thus, several processes were developed by using glycerol as accessible and bio-based starting material from the oleochemical industry. First, we found a benign and eco-friendly process for the synthesis of1-O-alkyl glyceryl ethers by catalytic reductive alkylation of carboxylic acids with a recyclable catalytic system associating palladium on carbon and an acid ion exchange resin. A second two steps procedure was also developed when starting from a vegetable oil or a methyl ester, which was transesterified to the corresponding monoglyceride followed by its reduction by catalytic hydrogenation. We report also a straight forward and palladium catalyzed dehydrogenative alkylation of cyclohexanone derivatives with alcohols, including glycerol, and amines in order to prepare avariety or aryl ethers and aryl amines. Finally, we prepared new aprotic and glycerol-based solvents bya solvent-free phase-transfer catalysis. In particular, the toxicity of 1,2,3-trimethoxypropane and its utilization as alternative solvent in chemical transformations was evaluated