Bibliografie tematiche / Furanic polymers

Letteratura scientifica selezionata sul tema "Furanic polymers"

Autore: Grafiati

Pubblicato: 1 giugno 2024

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Articoli di riviste sul tema "Furanic polymers":

Padilla, Rosa, Sakhitha Koranchalil e Martin Nielsen. "Homogeneous Catalyzed Valorization of Furanics: A Sustainable Bridge to Fuels and Chemicals". Catalysts 11, n. 11 (13 novembre 2021): 1371. http://dx.doi.org/10.3390/catal11111371.

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The development of efficient biomass valorization is imperative for the future sustainable production of chemicals and fuels. Particularly, the last decade has witnessed the development of a plethora of effective and selective transformations of bio-based furanics using homogeneous organometallic catalysis under mild conditions. In this review, we describe some of the advances regarding the conversion of target furanics into value chemicals, monomers for high-performance polymers and materials, and pharmaceutical key intermediates using homogeneous catalysis. Finally, the incorporation of furanic skeletons into complex chemical architectures by multifunctionalization routes is also described.

Salabarria, Inraini Ramos, Norma Galego, Maria Jose Galante e Analia Vazquez. "Furanic Foams". Cellular Polymers 10, n. 3 (maggio 1991): 227–39. http://dx.doi.org/10.1177/026248939101000304.

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Eckardt, Jonas, Gianluca Tondi, Genny Fanchin, Alexander Lach e Robert R. Junker. "Effect of Tannin Furanic Polymer in Comparison to Its Mimosa Tannin Extract on the Growth of Bacteria and White-Rot Fungi". Polymers 15, n. 1 (29 dicembre 2022): 175. http://dx.doi.org/10.3390/polym15010175.

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Tannins are well-known to protect plants from bacteria and fungi, but nothing is known about its effects on microorganisms once they are copolymerized. Therefore, a study was conducted to evaluate the effect of a tannin–furanic polymer in comparison with industrial mimosa tannin extract on the in vitro growth of two strains of bacteria, Bacillaceae and Pseudomanadaceae, and two white-rot fungi, Trametes versicolor and Agrocybe aegerita. Results have highlighted that the tannin polymer did not inhibit the growth of tested bacteria and even favored the growth of Bacillaceae without extra glucose. The growth of both fungi was enhanced by mimosa tannin and its polymer at low concentrations (<1%), while concentrations above 10% had a growth-inhibiting effect, which was slightly less strong for the polymer compared to the tannin against Trametes versicolor. These findings highlighted that tannin–furanic polymers can be tolerated by certain microorganisms at low concentration and that their inhibitory effect is similar or slightly lower than that of the pristine tannin extract.

Sepperer, Thomas, Jonas Neubauer, Jonas Eckardt, Thomas Schnabel, Alexander Petutschnigg e Gianluca Tondi. "Pollutant Absorption as a Possible End-Of-Life Solution for Polyphenolic Polymers". Polymers 11, n. 5 (20 maggio 2019): 911. http://dx.doi.org/10.3390/polym11050911.

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Tannin- and lignin-furanic foams are natural porous materials that have attracted high interest in the scientific and industrial communities for their high thermal and fire-resistant properties. However, no interesting solutions have been proposed for the management of their end-life as yet. In this study, the phenolic-furanic powders derived from the foams were analyzed for their capacity to remove different pollutants like neutral, cationic, and anionic organic molecules from wastewater. It was observed that the macromolecules produced from initially bigger fractions were more suitable to remove methylene blue and sodium dodecyl sulfate (SDS) while contained absorptions were observed for riboflavin. Acidified tannin powders were also prepared to understand the role of the flavonoid in the absorption mechanism. The latter showed outstanding absorption capacity against all of the tested pollutants, highlighting the key-role of the flavonoid fraction and suggesting the limited contribution of the furanic part. All adsorbents were investigated through FT-IR and solid state 13C-NMR. Finally, the powders were successfully regenerated by simple ethanol washing, showing almost complete absorption recovery.

Galkin, Konstantin I., Irina V. Sandulenko e Alexander V. Polezhaev. "Diels–Alder Cycloadditions of Bio-Derived Furans with Maleimides as a Sustainable «Click» Approach towards Molecular, Macromolecular and Hybrid Systems". Processes 10, n. 1 (24 dicembre 2021): 30. http://dx.doi.org/10.3390/pr10010030.

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This mini-review highlights the recent research trends in designing organic or organic-inorganic hybrid molecular, biomolecular and macromolecular systems employing intermolecular Diels–Alder cycloadditions of biobased, furan-containing substrates and maleimide dienophiles. The furan/maleimide Diels–Alder reaction is a well-known process that may proceed with high efficiency under non-catalytic and solvent-free conditions. Due to the simplicity, 100% atom economy and biobased nature of many furanic substrates, this type of [4+2]-cycloaddition may be recognized as a sustainable “click” approach with high potential for application in many fields, such as fine organic synthesis, bioorganic chemistry, material sciences and smart polymers development.

Zuen, Hui, e Alessandro Gandini. "Crystalline furanic polyisocyanates". Polymer Bulletin 26, n. 4 (agosto 1991): 383–90. http://dx.doi.org/10.1007/bf00302604.

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Zhang, Bengang, Mathieu Petrissans, Anelie Petrissans, Antonio Pizzi e Baptiste Colin. "Furanic Polymerization Causes the Change, Conservation and Recovery of Thermally-Treated Wood Hydrophobicity before and after Moist Conditions Exposure". Polymers 15, n. 1 (31 dicembre 2022): 221. http://dx.doi.org/10.3390/polym15010221.

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The Whilhelmy method of contact angle, wood thermal properties (TG/DTG), infrared spectroscopy, etc. was used to define the hydrophobicity of heat-treated beech and fir wood at increasing temperatures between 120 °C and 300 °C. By exposure to wet conditions during 1 week, the hydrophobic character obtained by the heat treatment remains constant heat-treated. Heat induced wood hydrophobation, was shown by CP MAS 13C NMR and MALDI ToF mass spectrometry to be mainly caused by furanic moieties produced from heat-induced hemicelluloses degradation. This is caused by the acid environment generated by the hydrolysis of the hemicelluloses acetyl groups. Furfural polymerizes to linear and branched oligomers and finally to water repellent, insoluble furanic resins. The water repellent, black colored, cross-linked polymerized furanic network is present throughout the heat-treated wood. Wood darkening as well as its water repellency due to increasing proportions of black colored furanic resins increase as a function of the increase with treating temperature, becoming particularly evident in the 200 to 300 °C treating temperature range.

Zhao, Deyang, Frederic Delbecq e Christophe Len. "One-Pot FDCA Diester Synthesis from Mucic Acid and Their Solvent-Free Regioselective Polytransesterification for Production of Glycerol-Based Furanic Polyesters". Molecules 24, n. 6 (15 marzo 2019): 1030. http://dx.doi.org/10.3390/molecules24061030.

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A one pot-two step procedure for the synthesis of diethyl furan-2,5-dicarboxylate (DEFDC) starting from mucic acid without isolation of the intermediate furan dicarboxylic acid (FDCA) was studied. Then, the production of three different kinds of furan-based polyesters— polyethylene-2,5-furan dicarboxylate (PEF), polyhydropropyl-2,5-furan dicarboxylate(PHPF) and polydiglycerol-2,5-furandicarboxylate (PDGF)—was realized through a Co(Ac)2·4H2O catalyzed polytransesterification performed at 160 °C between DEFDC and a defined diol furan-based prepolymer or pure diglycerol. In parallel to polymerization process, an unattended regioselective 1-OH acylation of glycerol by direct microwave-heated FDCA diester transesterification led to the formation of a symmetric prepolymer ready for further polymerization and clearly identified by 2D NMR sequences. Furthermore, the synthesis of a more soluble and hydrophilic diglycerol-based furanic polyester was also achieved. The resulting biobased polymers were characterized by NMR, FT-IR spectroscopy, DSC, TGA and XRD. The morphologies of the resulted polymers were observed by FE-SEM and the purity of the material by EDX.

Luo, Kaiju, Yan Wang, Junrong Yu, Jing Zhu e Zuming Hu. "Semi-bio-based aromatic polyamides from 2,5-furandicarboxylic acid: toward high-performance polymers from renewable resources". RSC Advances 6, n. 90 (2016): 87013–20. http://dx.doi.org/10.1039/c6ra15797a.

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Faddeev, Nikita, Victor Klushin e Nina Smirnova. "Bio-Based Anti-Corrosion Polymer Coating for Fuel Cells Bipolar Plates". Key Engineering Materials 869 (ottobre 2020): 413–18. http://dx.doi.org/10.4028/www.scientific.net/kem.869.413.

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A highly corrosion resistant and conductive polymer coating for polymer electrolyte membrane fuel cells bipolar plates have been successfully prepared from renewable plant biomass sources. The coating is based on the 5-hydroxymethylfurfural synthesis by-product resin that consists of complex furanic oligomers and polymers. The corrosion resistance and conductivity of coated titanium plates have been studied. As-prepared coated Ti samples are shown 0.083 μA/cm2 and 0.32 μA/cm2 corrosion current in the simulated PEMFCs cathode and anode environment respectively. In addition, the polymer coating are reduced the interfacial contact resistance of bare titanium up to 40 %. The Ti plates coated with by-products of 5-HMF synthesis are shown a great potential application as bipolar plates for PEMFCs.

Più fonti

Tesi sul tema "Furanic polymers":

Dellière, Pierre. "Résines furaniques modulables et durables". Electronic Thesis or Diss., Université Côte d'Azur, 2023. http://www.theses.fr/2023COAZ4106.

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Cette thèse de doctorat s'est déroulée dans le cadre du projet ANR FUTURES (Furanic TUnable REsins for Sustainable materials, i.e., Résines furaniques modulables et durables). L'alcool polyfurfurylique est un polymère thermodurcissable biosourcé qui possède d'excellentes propriétés chimiques et thermiques malgré un comportement cassant. L'objectif de ce projet est d'ouvrir la voie à de nouvelles applications pour l'alcool polyfurfurylique en exploitant les réactions secondaires qui ont lieu lors de la polymérisation. Cela permettra d'apporter de nouvelles fonctionnalités au matériau réticulé et de jouer sur la fragilité du matériau.Premièrement, les groupements carbonyls résultants de l'ouverture du cycle furanique lors de la polymérisation de l'alcool polyfurfurylique ont été quantifiés par potentiométrie et RMN quantitative. Les facteurs influençant le taux de carbonyls dans le polymère ont été évalués et la présence additionnelle d'eau au cours de la polymérisation s'est révélé être un facteur capital. Ensuite, l'environnement chimique des carbonyls a été apprécié par l'utilisation de RMN bidimensionnelle et un nouveau phénomène de réticulation de surface a été identifié et expliqué. L'impact de cette réticulation de surface sur les propriétés finales du matériau a été également mis en avant. Enfin, la présence de carbonyls résultant de l'ouverture de cycle a été exploitée pour fonctionnaliser le polymère post-réticulation. En utilisant des amines flexibles, le matériau passe progressivement d'un comportement cassant à un comportement plus ductile, permettant ainsi d'entrevoir de nouvelles applications. Les facteurs gouvernant les propriétés des matériaux fonctionnalisés par les amines ont également été étudiés
This doctoral project was conducted within the ANR FUTURES (FUranic TUnable REsins for Sustainable materials) project.Poly(furfuryl alcohol) is a bio-based thermoset with excellent chemical and thermal properties. Yet, it may mechanically behave in a brittle manner. The aim of the project was to pave the way for new applications of poly(furfuryl alcohol) by exploiting side reactions occurring during polymerization. This leads to additional functionalities that could be exploited to, among others, reduce the brittleness of the material.First, the reactive carbonyl resulting from the furan ring opening side reaction were quantified by potentiometry and quantitative NMR. The key factors that were influencing the carbonyl content were assessed and water proved to be the main one. The chemical nature of the carbonyls was thoroughly investigated by 2D NMR and a new surface crosslinking phenomenon was identified and explained. The impact of this surface crosslinking on the materials' properties was evaluated. Finally, the presence of carbonyls due to the ring-opening side reaction was exploited to functionalize the polymer. The use of large flexible amines allowed to shift the materials properties from brittle to ductile therefore paving to way to new applications for poly(furfuryl alcohol). Finally, factors governing the properties of the amine-functionalized materials were studied

Coutterez, Claire. "Synthèse, caractérisation et étude des propriétés d'oligomères et polymères hétéroarylène vinylènes". Grenoble INPG, 1998. http://www.theses.fr/1998INPG0163.

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Le travail de cette these a concerne la synthese, la caracterisation et l'etude de proprietes d'usage de structures oligomeres et polymeres conjuguees. L'originalite de ces travaux reside d'une part dans l'utilisation d'heterocycles furaniques et thiopheniques comme elements constitutifs des chaines et d'autre part, dans le fait que de nombreux composes oligomeres ont ete cibles, isoles et caracterises. Les possibilites d'application de ces materiaux dans les domaines touchant a l'electronique (conducteurs ou semi-conducteurs), a l'optique (cristaux liquides) et a la luminescence photo- et electroinduite, ont ete ensuite explorees. Ces recherches se divisent en cinq themes : (i) etude des reactions de polycondensation en milieu basique du 5-methyl furfural et du 5-2-(5-methyl furyl vinylene)furfural, avec caracterisation precise des oligo(furylene vinylene)s resultants et des polymeres correspondants. Etude des proprietes de conduction electronique apres dopage a l'iode. Etude de la photoluminescence. (ii) synthese et caracterisation d'oligo(heteroarylene vinylene)s furaniques, thiopheniques et mixtes par condensation en milieu basique de monomeres furaniques et/ou thiopheniques. (iii) synthese et caracterisation de bases de schiff ene-heterocycliques/aromatiques mono- et difonctionnelles. Etudes des proprietes thermiques et plus particulierement du comportement mesogene de ces structures. (iv) preparation d'electrolytes polymeres reticules (macrobases de schiff) : formation photochimique du reseau via la presence intrinseque d'unites -2,5-fu-ch = ch-fu-2,5-chromophores. Etude de la conductivite ionique apres dopage avec des sels de lithium. (v) preparation de polyacetylenes monosubstitues par des esters 2-furoiques dans le but d'obtenir des materiaux solubles et possedant, sous forme de membrane des proprietes de permeabilite selective des fluides.

Cousin, Thibault. "Synthesis and molecular modelling of bio-based polyamides". Phd thesis, INSA de Lyon, 2013. http://tel.archives-ouvertes.fr/tel-00952848.

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In the current context of oil resources rarefaction, the development of biobased polymers is of major importance. The present work focused on the development of a biobased amorphous polyphthalamide, based on furan-2,5-dicarboxylic acid. The first part of the study was devoted to the development of a molecular modelling protocol that could calculate the glass transition temperature of polyphthalamides with accuracy. In order to do this, model polyphthalamides based on isophthalic, terephthalic acid and hexamethylene diamine were synthesized and characterized as well as simulated. By comparison between simulated and measured Tg, the protocol was validated. In a second part of the study, this protocol was applied to FDCA based polyphthalamides. These PPA were also synthesized. It was found that the PA 6-F undertakes a decarboxylation, preventing it from reaching high a molar mass. It was also found that the mechanical and thermal properties decrease as the amount of FDCA in the copolymers increases.

Gunes, Arzu. "Synthesis Of A Novel Series Of Furan And Fluorene Containing Monomers And Their Polymers". Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613768/index.pdf.

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In this study, a novel series of conjugated monomers containing furan and fluorene units
2,7-di(furan-2-yl)-9H-fluoren-9-one (FOF), 2-(2-(furan-2-yl)-9H-fluoren-7-yl)furan (FFF), and 2-(2-(furan-2-yl)-9,9-dihexyl-9H-fluoren-7-yl)furan (FHF) were synthesized and their electrochemical polymerization were achieved via potential cycling. Optical and electrochemical properties of the polymers, poly(2,7-di(furan-2-yl)-9H-fluoren-9-one) (PFOF), poly(2-(2-(furan-2-yl)-9H-fluoren-7-yl)furan (PFFF) and poly(2-(2-(furan-2-yl)-9,9-dihexyl-9H-fluoren-7-yl)furan) (PFHF) were investigated and it was found that polymer films exhibit reversible redox behavior (Epox = 1.083 V for PFOF, Epox= 0.915 V for PFFF and Epox= 0.985 V for PFHF) accompanied with a reversible electrochromic behavior, orange to green for PFOF, yellow to dark blue for PFFF and orange to green for PFHF during oxidation. Their band gap values (Eg) were found to be 2.32, 2.49 and 2.61 eV for PFOF, PFFF and PFHF, respectively.

Ghorbel, Inès. "Elaboration, caractérisation et mise en œuvre de matériaux polymères à base de polysemicarbazides et polyester furanique bio-sourcés". Thesis, Lyon, INSA, 2013. http://www.theses.fr/2013ISAL0013.

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Ce travail est développé dans le but d’élaborer, caractériser et mettre en œuvre de matériaux polymères à base de polysemicarbazides et polyesters furaniques bio-sourcés. L’étude comporte trois grandes parties : la synthèse et l’optimisation du procédé de synthèse de poly(acylsemicarbazide)s, la préparation de quelques mélanges de polymères en mini-bivis de polymères furaniques (PEF ou PSC) avec le PET, le PLA et le PHA et l’élaboration de nouveaux copolyesters furano-aliphatiques par polymérisation par ouverture de cycle (PEF/PCL) ou par réactions d’interéchanges à l’état fondu de mélange d’homopolymères (PEF/PCL, PEF/PLA et PEF/PHA). Nous rapportons dans le premier chapitre de ce mémoire la synthèse d’une série de dihydrazides bifuraniques et l’étude de leur réactivité vis-à-vis de divers diisocyanates aromatiques afin d’élaborer des polyacylsemicarbazides furano-aromatiques. Notre étude est abordée en examinant le comportement d’un système de monomères modèle dans différentes conditions expérimentales afin d’optimiser le procédé de polycondensation avant de l’appliquer à diverses combinaisons de monomères. Nous traitons dans le deuxième chapitre l’élaboration de nouveaux matériaux à base de polymères furaniques (PEF ou PSC) par mélange de polyesters à l’état fondu. Pour cela, nous avons élaboré 3 types de mélanges polyester furaniques / polyesters aliphatiques et aromatiques. Enfin, nous nous intéressons dans le troisième chapitre à la synthèse de divers polyesters furaniques à extrémités contrôlées : PEF-dihydroxy (PEF di-OH), PEF-dicarboxylé (PEF di-COOH), PEF-diéthylester (PEF di-COOEt) et PEF à extrémités mixtes (PEF di-OH/COOEt). Ces derniers ont été utilisés pour l’élaboration de nouveaux polyesters furano-aliphatiques par la technique de polymérisation par ouverture de cycle (PEF /PCL) ou suite à des réactions d’interéchange à l’état fondu à partir de mélanges d’homopolymères (PEF/PLA, PEF/PHA et PEF/PCL)
This work aims at elaborating, characterising and processing polymer materials based on bio-sourced polysemicarbazides and furanic polyesters. The study has three main parts : Synthesis and optimisation of the synthesis of poly(acylsemicarbazide)s, elaboration of polymer blends based on furanic polymers (PEF or PSC) with PET, PLA and PHA and elaboration of new furano-aliphatic copolyesters by ring opening polymerisation (PEF/PCL) or by inter-exchange reactions between ’homopolymers (PEF/PCL, PEF/PLA et PEF/PHA) in the melt. The first chapter reports on the synthesis of a serie of bifuranic dihydrazides and on the study of their reactivity with several aromatic diisocyanates in order to elaborate furano-aromatic polyacylsemicarbazides. The behaviour of model monomer systems in various experimental conditions is studied in order to d’optimise the polycondensation processbefore transfering it to several monomer combinations. In the second chapter, we study the elaboration of new materials based on furanic polymers (PEF or PSC) blended with polyesters in the melt. 3 kinds of blends based on furanic polyesters / aliphatic and aromatic polyesters. The third chapter is devoted to the synthesis of furanic polyesters with controlled ends : dihydroxy-PEF (PEF di-OH), dicarboxylate-PEF (PEF di-COOH), diethylester-PEF (PEF di-COOEt) as well as PEF with mixed ends (PEF di-OH/COOEt). The latest have been used for the elaboration of new furano-aliphatic polyesters by ring opening polymerisation (PEF /PCL) or after interexchange reaction in melt homoplymer blends (PEF/PLA, PEF/PHA and PEF/PCL)

Baret, Fanton Véronique. "Contribution à l'étude des polymères furaniques photoactifs". Grenoble INPG, 1995. http://www.theses.fr/1995INPG0110.

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Cette these s'insere dans le contexte general d'une strategie visant a valoriser des materiaux issus de ressources renouvelables et traite plus specifiquement de la synthese et de la caracterisation de nouveaux oligomeres et polymeres furaniques photoactifs, notamment, des polymeres photoreticulables et des polymeres photodegradables. On a ainsi obtenu une nouvelle famille de materiaux dans laquelle l'heterocycle furanique est l'element original par rapport a des materiaux connus (aliphatiques ou aromatiques) issus de la petrochimie. La premiere partie de ce travail consiste en la synthese de nombreuses structures qui a l'etat solide, reagissent sous l'action de rayonnements uv, en formant soit des cyclobutanes pour les composes comportant une insaturation, soit des cyclophanes dans le cas ou les composes comportent deux insaturations non conjuguees. Ensuite, ces structures ont ete accrochees sur l'alcool polyvinylique donnant lieu a des materiaux photosensibles en vue d'une application industrielle ulterieure. Ce travail a montre que l'introduction du noyau furanique dans des structures photosensibles peut constituer une nouvelle famille de materiaux polymeres avec des proprietes prometteuses.

Nasr, Kifah. "Enzyme-catalyzed synthesis of polyesters by step-growth polymerization : a promising approach towards a greener synthetic pathway". Electronic Thesis or Diss., Université de Lille (2018-2021), 2021. http://www.theses.fr/2021LILUR030.

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La polymérisation catalysée par des enzymes a fait l'objet d'une attention croissante ces dernières années en tant qu’alternative écologique à la catalyse à base de métal. L'objectif de notre travail est de synthétiser une série de polyesters par catalyse enzymatique basée sur différents diols et diesters aliphatiques et aromatiques, où nous nous sommes concentrés sur l'influence des paramètres de réaction, des structures de monomères et avons décrit les avantages et les limites de la catalyse enzymatique dans la synthèse de polymères. L'enzyme utilisée tout au long de nos travaux était Novozym 435, une lipase de Candida antarctica, immobilisée sur une résine acrylique. Dans le Chapitre 1, nous avons passé en revue les différentes méthodes et approches utilisées dans la littérature pour synthétiser des polymères par catalyse enzymatique. Dans le Chapitre 2, nous avons effectué la réaction entre l’hexane-1,6-diol et l'adipate de diéthyle via une approche de polycondensation en deux étapes où nous avons évalué l'effet de certains paramètres sur la masse molaire moyenne en nombre (Mn). L'effet de la température, du vide et de la charge enzymatique a été déterminé à l'aide d'un plan d’expérience de type plan composite centré. D'autres facteurs tels que le milieu réactionnel, le temps d'oligomérisation et la recyclabilité de l’enzyme ont également été évalués. Dans le Chapitre 3, des copolyesters à base de furane ont été synthétisés, où nous avons montré que nous pouvons incorporer des quantités plus élevées de dérivés furaniques lors de l'utilisation de diols aliphatiques avec des chaînes plus longues tels que le dodécane-1,12-diol. Dans le Chapitre 4, le lévoglucosan, une structure cyclique anhydre à 6 carbones et un produit de pyrolyse d'hydrates de carbone tels que l'amidon et la cellulose, a réagi avec des diesters de différentes longueurs de chaîne en présence de diols aliphatiques et de Novozym 435 comme catalyseur. Les polyesters produits étaient limités en terme de masse molaire moyenne en nombre (Mn) et de quantité de lévoglucosan incorporée. En augmentant la longueur du diester, nous avons augmenté la quantité de lévoglucosan incorporée ainsi que la masse molaire moyenne en nombre
Enzyme-catalyzed polymerization have been witnessing a growing attention in recent years as an eco-friendly substitute to metal-based catalysis. The objective of our work is to synthesize a series of polyesters via enzymatic catalysis based on different aliphatic and aromatic diols and diesters, where we focused on the influence of reaction parameters, monomer structures, and depicted the advantages and limitation of enzymatic catalysis in polymer synthesis. The enzyme used throughout our work was Novozym 435, a lipase from Candida antarctica, immobilized on an acrylic resin. In Chapter 1, we reviewed the different methods and approaches used in the literature to synthesize polymers via enzymatic catalysis. In Chapter 2, we performed the reaction between hexane-1,6-diol and diethyl adipate via a two-step polycondensation approach where we monitored the effect of certain parameters on the number average molecular weight (Mn). The influence of temperature, vacuum, and the amount of enzyme loading were determined using a central composite design. Other factors such as the reaction media, oligomerization time, and catalyst recyclability were also assessed. In Chapter 3 furan-based copolyesters were synthesized, where we showed that we can incorporate higher amounts of furan when using aliphatic diols with longer chains such as dodecane-1,12-diol. In Chapter 4, levoglucosan, an anhydrous 6-carbon ring structure and a pyrolysis product of carbohydrates such as starch and cellulose, was reacted against different chain length diesters in the presence of aliphatic diols and Novozym 435 as a catalyst. The polyesters produced were limited in their number average molecular weight (Mn) and the amount of levoglucosan that was successfully incorporated into the polymeric structure. Nevertheless, by increasing the chain length of the diester, we were able to produce a copolymer containing higher amounts of levoglucosan and a higher molecular weight

Dillingham, Keith Alfred. "The preparation and modification of polyvinylfuran, copolymers of vinylfuran and styrene, and polyacenaphthylene". Thesis, Lancaster University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282364.

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Marotta, Angela. "Résines thermodurcissables et nanocomposites époxydes renouvelables à base de furanne pour les applications de revêtement". Thesis, Université Côte d'Azur (ComUE), 2019. http://www.theses.fr/2019AZUR4003/document.

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La recherche scientifique concernant les polymères biosourcés augmente rapidement pendant les dernières années, poussée par des croissantes préoccupations écologiques et économiques, ainsi que par l'incertitude sur la disponibilité future de ressources pétrochimiques limitées. Durabilité est un mot-clé de ce processus. Dans ce cadre, des produits respectueux de l'environnement, y compris des molécules et des additifs eco-compatibles, sont maintenant recherchés pour remplacer les polymères à base de pétrole par ceux dérivés de matières premières naturelles.Les résines époxydes sont des polymères thermodurcissables très polyvalents, extrêmement résistants à la corrosion, à l'humidité et aux produits chimiques, avec une bonne force d'adhérence à la plupart des matériaux et un faible retrait lors du durcissement. En raison de leurs températures de transition vitreuse élevées et de leur excellente résistance mécanique, les résines époxydes sont largement utilisées dans une large gamme d'applications, telles que l'électronique, les adhésifs structuraux, les composites pour l'aérospatiale et les revêtements protecteurs.Actuellement, plus des deux tiers des résines époxydes sont à base de diglycidyl éther de Bisphénol A. Dans cette industrie, la tendance à remplacer les matériaux dérivés du pétrole par des matériaux biosourcés est également liée à la nécessité de remplacer le bisphénol A (BPA), une molécule controversée, reconnu comme un perturbateur endocrinien et une substance reprotoxique. En particulier en application comme revêtement, l'utilisation de BPA présente un risque pour les utilisateurs d'aliments et de boissons conditionnés dans des récipients traités avec des résines époxydes. Les effets de la contamination du corps humain causée par le BPA sont le diabète, maladies cardiovasculaires, modification des enzymes hépatiques et les lésions de l'appareil reproducteur. Pour ces raisons, cette molécule a été interdite dans de nombreux pays pour la fabrication de produits pour enfants, ainsi qu'en France et au Canada de tous les matériaux en contact direct avec les aliments. La nécessité de développer de nouvelles résines époxy est donc urgente.Les molécules bio-dérivées développées depuis maintenant présentent des structures chimiques les plus diverses, chacune d’elles produisant des propriétés différentes des polymères finaux. Les caractéristiques particulières des résines époxydes sont liées à la structure aromatique de ses composants. Les molécules aromatiques présentes dans les matières premières naturelles proviennent principalement de la lignine, un des principaux constituants des parois cellulaires naturelles. Cependant, pour extraire des fragments aromatiques de la lignine, des procédés difficiles et consommateurs d’énergie sont nécessaires. Un substitut précieux des molécules aromatiques, facilement récupérables du glucose, sont les molécules furaniques ; leur validité a été étayée par plusieurs études.À la lumière de ce qui précède, les travaux présentés ici sont focalisés sur la production de résines époxyde à base de furane comme substitut potentiel de DGEBA dans l’industrie du revêtement de boîtes de conserve. Le cycle complet du matériau a été étudié : des synthèses de monomères époxydes furaniques ont été proposées, puis des thermodurcis époxydes ont été obtenus et caractérisés à la fois dans leurs propriétés chimiques et physiques (étude de la cinétique de durcissement, des propriétés mécaniques et thermiques). En outre, l’application des matériaux thermodurcissables époxydes proposés comme revêtement interne des boîtes de conserve a été testée
Research on bio-based polymers is rapidly increasing in last years, pushed by growing environmental and economic concerns, as well as by the uncertainty about future availability of finite petrochemical resources. Sustainability is a keyword in this process. In this frame, products that are respectful towards the environment, including eco-compatible building blocks and additives, are now researched to replace petroleum-based polymers with those derived from naturally occurring feedstocks. Epoxy resins are very versatile thermosetting polymers, extremely resistant to corrosion, moisture and chemicals, with good adhesive strength toward most materials (wettability) and low shrinkage upon curing. Due to their high glass transition temperatures and excellent mechanical strength, epoxy resins are widely employed in a broad range of applications, such as electronics, structural adhesives, aerospace composites and protective coatings. More than two-thirds of epoxy resins nowadays are based on diglycidyl ether of bisphenol A. In this industry the trend to replace petrol-derived materials with bio-based ones is related also to the necessity to substitute the Bisphenol A (BPA), a controversial building block recognized as an endocrine disrupter and reprotoxic substance. In particular in application as coating, the use of BPA results in hazard for customers of food and beverage products packed into containers treated with epoxy resins. The effects of human body contamination caused by BPA are diabetes, cardiovascular diseases, altered liver enzymes and reproductive apparatus damages. For these reasons, this molecule has been banned in many countries for the manufacturing of child products, and in France and Canada from all the materials in direct contact with food. The necessity to develop new epoxy resins results therefore urgent.Bio-derived molecules since now developed show the most various chemical structure, each of them producing different properties of final polymers. Peculiar characteristic shown by epoxy resins are related to the aromatic structure of its components. Aromatic molecules present in natural feedstock are mainly derived from lignin, one of the principal constituents of natural cell walls. However, to extract aromatic moieties from lignin, difficult and energy consuming processes are required. A valuable replacement of aromatic molecules, easily recoverable from glucose, are furanic molecules; their validity has been supported by several studies. In the light of the above, the work here presented is focused on production of furanic bio-based epoxy resins as potential substitute of DGEBA in can coating industry. The complete cycle of the material has been studied: the synthesis of furanic epoxy monomers and epoxy thermosets, the characterization of their chemical and physical properties (study of curing kinetics, mechanical and thermal properties). Furthermore, the application of bio-based epoxy thermosets as cans internal lining has been evaluated. Experimental results demonstrated that the obtained resins have good potential to be proposed as good alternatives to the traditional BPA-containing epoxy resins

Mealares, Christel. "Oligomères et polymères furaniques conjugués". Grenoble INPG, 1995. http://www.theses.fr/1995INPG0129.

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Dans le but de la valorisation non-alimentaire de la biomasse vegetale, nous avons prepare de nouveaux materiaux furaniques: (i) des oligomeres et copolymeres polyconjugues de type poly(2,5-furylene vinylene) (pfv) a partir de monomeres furaniques (et/ou thiopheniques) ainsi que (ii) des polybases de schiff furaniques et/ou aromatiques, et (iii) des polyacetylenes substitues par des groupes furaniques. Tous ces produits ont ete synthetises et caracterises par diverses methodes physico-chimiques (ir, rmn, dsc, atg, conductivite electrique. . . ) en vue de l'obtention de materiaux potentiellement conducteurs electroniques, electroluminescents, ou encore a permeabilite selective aux fluides

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Libri sul tema "Furanic polymers":

Gandini, A. Furan Polymers and Their Reactions. Wiley & Sons, Limited, John, 2023.

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Capitoli di libri sul tema "Furanic polymers":

Gooch, Jan W. "Furan". In Encyclopedic Dictionary of Polymers, 330. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_5360.

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Gooch, Jan W. "Furan Resin". In Encyclopedic Dictionary of Polymers, 330–31. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_5361.

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Gooch, Jan W. "Furan Prepreg". In Encyclopedic Dictionary of Polymers, 331. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_5362.

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McKillip, William J. "Chemistry of Furan Polymers". In ACS Symposium Series, 408–23. Washington, DC: American Chemical Society, 1989. http://dx.doi.org/10.1021/bk-1989-0385.ch029.

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Gandini, Alessandro. "Polymers and Oligomers Containing Furan Rings". In ACS Symposium Series, 195–208. Washington, DC: American Chemical Society, 1990. http://dx.doi.org/10.1021/bk-1990-0433.ch017.

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Coutterez, Claire, Cécile Goussé, Rana Gheneim, Sandrine Waig Fang e Alessandro Gandini. "New Oligomers and Polymers Bearing Furan Moieties". In ACS Symposium Series, 98–109. Washington, DC: American Chemical Society, 2001. http://dx.doi.org/10.1021/bk-2001-0784.ch008.

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Moore, J. A., e William W. Bunting. "Polyesters and Polyamides Containing Isomeric Furan Dicarboxylic Acids". In Advances in Polymer Synthesis, 51–91. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4613-2121-7_3.

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Gandini, Alessandro. "Furan Monomers and their Polymers: Synthesis, Properties and Applications". In Biopolymers - New Materials for Sustainable Films and Coatings, 179–209. Chichester, UK: John Wiley & Sons, Ltd, 2011. http://dx.doi.org/10.1002/9781119994312.ch9.

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Gandini, Alessandro. "Furans as Offsprings of Sugars and Polysaccharides and Progenitors of an Emblematic Family of Polymer Siblings". In Green Polymerization Methods, 29–56. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527636167.ch3.

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Schwartz, Thomas J., e Sikander H. Hakim. "Furanic Resins and Polymers". In Furfural, 293–308. WORLD SCIENTIFIC (EUROPE), 2018. http://dx.doi.org/10.1142/9781786344878_0016.

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Atti di convegni sul tema "Furanic polymers":

Banella, Maria Barbara, Claudio Gioia, Micaela Vannini, Martino Colonna, Annamaria Celli e Alessandro Gandini. "A new approach to the synthesis of monomers and polymers incorporating furan/maleimide Diels-Alder adducts". In VIII INTERNATIONAL CONFERENCE ON “TIMES OF POLYMERS AND COMPOSITES”: From Aerospace to Nanotechnology. Author(s), 2016. http://dx.doi.org/10.1063/1.4949584.

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KEMPPAINEN, JOSH, IVAN GALLEGOS, AARON KRIEG e GREGORY ODEGARD. "REACTIVE MOLECULAR DYNAMICS MECHANICAL PROPERTIES PREDICTION OF FURAN RESIN". In Proceedings for the American Society for Composites-Thirty Seventh Technical Conference. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/asc37/36391.

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During the reentry of aerospace vehicles into the earth’s atmosphere, the outer shell surface temperature can reach up to 2700°C, which would melt or degrade most materials. The high temperatures that aerospace vehicles face during reentry mean that these vehicles need a thermal protection system (TPS) to shield the rest of the structure and occupants. There are many categories of thermal protection systems and many materials have been used over the years, but the most notable are carbon-carbon composites (CCC). CCCs are usually manufactured by curing a polymer in a fiber preform and then heat-treating the composite until all non-carbon atoms are burnt out. Due to the complexity, it is desired to model the polymerization and carbonization process to fine-tune composite materials. The first step in modeling a CCC involves the polymerization of precursor material, and an atomistic model is to model the polymerization. Therefore, reactive molecular dynamics (MD) has been used to model the polymerization of precursor material. The precursor material selected for benchmarking and validation is furan resin (polyfurfuryl alcohol – PFA). Furan resin has been of interest for CCC ablatives since the 1950s due to its ability to achieve relatively high carbon yields, which reduces the number of carbonization cycles. Furan resin has also found uses in adhesives, corrosion protection, fuel propellants, and foundry molds. In this paper, you will find experimental curing of furan resin and an MD modeling approach for polymerization of furan resin.

Liu, Mengqing, e Xuhui Jin. "Synthesis of novel furan-based conjugated polymer for organic flexible electronics". In 2022 International Conference on Optoelectronic Information and Functional Materials (OIFM 2022), a cura di Chao Zuo. SPIE, 2022. http://dx.doi.org/10.1117/12.2640345.

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Klonos, Panagiotis, Lazaros Papadopoulos, Zoi Terzopoulou, Apostolos Kyritsis, George Papageorgiou e Dimitris Bikiaris. "Tuning the Crystallizability of Renewable Poly(alkylene 2,5-furan-dicarboxylate)s by In-Situ Adding Various Nanosized Nucleation Agents". In The First International Conference on “Green” Polymer Materials 2020. Basel, Switzerland: MDPI, 2020. http://dx.doi.org/10.3390/cgpm2020-07224.

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KEMPPAINEN, JOSH, IVAN GALLEGOS, JACOB R. GISSINGER, KRISTOPHER E. WISE, MALGORZATA KOWALIK e GREGORY M. ODEGARD. "REACTIVE MOLECULAR DYNAMICS SIMULATIONS OF THE FURAN PYROLYSIS PROCESS FOR CARBON- CARBON COMPOSITE FABRICATION". In Proceedings for the American Society for Composites-Thirty Eighth Technical Conference. Destech Publications, Inc., 2023. http://dx.doi.org/10.12783/asc38/36574.

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Carbon-Carbon composites (C/C composites) are an excellent thermal protection system for aerospace vehicles. The matrix material of most C/C composites, glassy carbon (GC), demonstrates excellent thermal stability and mechanical response with low mass densities. Although GC materials have been in development and use for decades, molecular simulation protocols need to be developed to accelerate the optimization of processing cycles and to drive the development of the next generation of C/C composites. This research aims to establish molecular dynamics (MD) simulation protocols to accurately predict the evolution of the molecular structure and properties of furan resin during the pyrolysis processes that convert the polymer into a GC material. MD workflows are developed using a reactive force field to simulate the evolution of the molecular structure, mass density, and elastic properties of furan resin-derived GC. MD simulation parameters are optimized, and the predicted structures and properties are shown to agree with experimental measurements from the literature. The modeling methodology established in this work can provide guidance in driving the development of the next-generation C/C composite precursor chemistries.