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Bibliografías temáticas / Polyoxazolin

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Literatura académica sobre el tema "Polyoxazolin"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 15 de febrero de 2022

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Artículos de revistas sobre el tema "Polyoxazolin"

1

England, R. M., J. I. Hare, P. D. Kemmitt, K. E. Treacher, M. J. Waring, S. T. Barry, C. Alexander y M. Ashford. "Enhanced cytocompatibility and functional group content of poly(l-lysine) dendrimers by grafting with poly(oxazolines)". Polymer Chemistry 7, n.º 28 (2016): 4609–17. http://dx.doi.org/10.1039/c6py00478d.

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We report the use of polyoxazolines as materials for modifying the surface of a generation 5 l-lysine dendrimer resulting in a significant improvement in the biocompatibility properties compared to the unmodified dendrimer. The polyoxazoline coatings represent interesting alternatives to polyethylene glycol and can also offer an opportunity for increasing drug loading.

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2

Sťahel, Pavel, Věra Mazánková, Klára Tomečková, Petra Matoušková, Antonín Brablec, Lubomír Prokeš, Jana Jurmanová et al. "Atmospheric Pressure Plasma Polymerized Oxazoline-Based Thin Films—Antibacterial Properties and Cytocompatibility Performance". Polymers 11, n.º 12 (12 de diciembre de 2019): 2069. http://dx.doi.org/10.3390/polym11122069.

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Polyoxazolines are a new promising class of polymers for biomedical applications. Antibiofouling polyoxazoline coatings can suppress bacterial colonization of medical devices, which can cause infections to patients. However, the creation of oxazoline-based films using conventional methods is difficult. This study presents a new way to produce plasma polymerized oxazoline-based films with antibiofouling properties and good biocompatibility. The films were created via plasma deposition from 2-methyl-2-oxazoline vapors in nitrogen atmospheric pressure dielectric barrier discharge. Diverse film properties were achieved by increasing the substrate temperature at the deposition. The physical and chemical properties of plasma polymerized polyoxazoline films were studied by SEM, EDX, FTIR, AFM, depth-sensing indentation technique, and surface energy measurement. After tuning of the deposition parameters, films with a capacity to resist bacterial biofilm formation were achieved. Deposited films also promote cell viability.

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3

Oudin, Amandine, Julie Chauvin, Laure Gibot, Marie-Pierre Rols, Stéphanie Balor, Dominique Goudounèche, Bruno Payré et al. "Amphiphilic polymers based on polyoxazoline as relevant nanovectors for photodynamic therapy". Journal of Materials Chemistry B 7, n.º 32 (2019): 4973–82. http://dx.doi.org/10.1039/c9tb00118b.

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4

Mazánková, Věra, Pavel Sťahel, Petra Matoušková, Antonín Brablec, Jan Čech, Lubomír Prokeš, Vilma Buršíková et al. "Atmospheric Pressure Plasma Polymerized 2-Ethyl-2-oxazoline Based Thin Films for Biomedical Purposes". Polymers 12, n.º 11 (13 de noviembre de 2020): 2679. http://dx.doi.org/10.3390/polym12112679.

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Polyoxazoline thin coatings were deposited on glass substrates using atmospheric pressure plasma polymerization from 2-ethyl-2-oxazoline vapours. The plasma polymerization was performed in dielectric barrier discharge burning in nitrogen at atmospheric pressure. The thin films stable in aqueous environments were obtained at the deposition with increased substrate temperature, which was changed from 20 ∘C to 150 ∘C. The thin film deposited samples were highly active against both S. aureus and E. coli strains in general. The chemical composition of polyoxazoline films was studied by FTIR and XPS, the mechanical properties of films were studied by depth sensing indentation technique and by scratch tests. The film surface properties were studied by AFM and by surface energy measurement. After tuning the deposition parameters (i.e., monomer flow rate and substrate temperature), stable films, which resist bacterial biofilm formation and have cell-repellent properties, were achieved. Such antibiofouling polyoxazoline thin films can have many potential biomedical applications.

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5

Beck, M., P. Birnbrich, U. Eicken, H. Fischer, W. E. Fristad, B. Hase y H. J. Krause. "Polyoxazoline auf fettchemischer Basis". Angewandte Makromolekulare Chemie 223, n.º 1 (diciembre de 1994): 217–33. http://dx.doi.org/10.1002/apmc.1994.052230116.

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6

Rayeroux, David, Christophe Travelet, Vincent Lapinte, Redouane Borsali, Jean-Jacques Robin y Cécile Bouilhac. "Tunable amphiphilic graft copolymers bearing fatty chains and polyoxazoline: synthesis and self-assembly behavior in solution". Polymer Chemistry 8, n.º 29 (2017): 4246–63. http://dx.doi.org/10.1039/c7py00632b.

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7

Ramiasa, M. N., A. A. Cavallaro, A. Mierczynska, S. N. Christo, J. M. Gleadle, J. D. Hayball y K. Vasilev. "Plasma polymerised polyoxazoline thin films for biomedical applications". Chemical Communications 51, n.º 20 (2015): 4279–82. http://dx.doi.org/10.1039/c5cc00260e.

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We report novel solvent-free and substrate independent, plasma polymerised nanoscale biocompatible polyoxazoline coatings capable of controlling protein and cell adhesion, and significantly reducing biofilm build up.

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8

Legros, Camille, Marie-Claire De Pauw-Gillet, Kam Chiu Tam, Daniel Taton y Sébastien Lecommandoux. "Crystallisation-driven self-assembly of poly(2-isopropyl-2-oxazoline)-block-poly(2-methyl-2-oxazoline) above the LCST". Soft Matter 11, n.º 17 (2015): 3354–59. http://dx.doi.org/10.1039/c5sm00313j.

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9

Morgese, Giulia y Edmondo M. Benetti. "Polyoxazoline biointerfaces by surface grafting". European Polymer Journal 88 (marzo de 2017): 470–85. http://dx.doi.org/10.1016/j.eurpolymj.2016.11.003.

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Macgregor-Ramiasa, Melanie N., Alex A. Cavallaro y Krasimir Vasilev. "Properties and reactivity of polyoxazoline plasma polymer films". Journal of Materials Chemistry B 3, n.º 30 (2015): 6327–37. http://dx.doi.org/10.1039/c5tb00901d.

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Nanoscale polyoxazoline coatings generated via a single step plasma deposition process are investigated. The complex functionality of the film can be controlled by varying the deposition conditions. Partial retention of the oxazoline ring facilitates covalent binding of nanoparticles and biomolecules.

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Tesis sobre el tema "Polyoxazolin"

1

Meyer, Matthias. "PIPOX-PEP kontrollierte Synthese und Aggregationsverhalten von Blockcopolymeren mit schaltbarer Hydrophilie /". Phd thesis, [S.l.] : [s.n.], 2006. http://opus.kobv.de/ubp/volltexte/2006/1083.

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Tomečková, Klára. "Depozice a charakterizace polymerních vrstev připravených na bázi 2-methyl-2-oxazolinu". Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2020. http://www.nusl.cz/ntk/nusl-414133.

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Polyoxazolines are class of polymers which are suitable for medical applications because they have many interesting properties. These polymers are characterized by antibacterial properties so they can stop bacterial colonization of medical devices and significantly reduce the risk of infection. Furthermore, polyoxazolines are interesting for good biocompatibility. Basic topic of this diploma work is preparation of oxazoline-based thin films by plasma polymerization. Thin films were prepared by plasma polymerization from 2-methyl-2-oxazoline vapors in a nitrogen atmosphere in a dielectric barrier discharge. During the deposition was increased the substrate temperature. Polyoxazoline films were analyzed by several diagnostic methods. Physical and chemical properties of thin films were studied by SEM, AFM, FTIR by measuring contact angles and nanoindentation method. The films were found to be homogeneous, hydrophilic and have a higher nitrogen content. Furthermore, films showed viscoelastic properties. Polyoxazoline films were subjected to antibacterial and biocompatibility tests and the result showed, that films have antibacterial properties and support of viability cells viability.

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3

Kucserová, Aneta. "Příprava a charakterizace vrstev deponovaných metodou plazmové polymerace na bázi 2-ethyl-2-oxazolinu". Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2020. http://www.nusl.cz/ntk/nusl-414168.

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The diploma thesis deals with the deposition of layers of 2-ethyl-2-oxazoline monomer in a dielectric barrier discharge in a nitrogen atmosphere. The theoretical part describes polyoxazolines, dielectric barrier discharge, plasma polymerization and diagnostic methods that describe the characteristics of the prepared layers. The experimental part deals with the deposition of layers and the determination of physicochemical properties. Finally, the results are compared with layers that were made of 2-methyl-2-oxazoline.

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4

Deeley, Jon. "Synthesis of novel polyoxazole-based cyclopeptides". Thesis, University of Nottingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.423663.

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5

Saadi, Mona. "Synthesis of telomerase inhibitors based on polyoxazoles". Thesis, University College London (University of London), 2007. http://discovery.ucl.ac.uk/1446074/.

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This thesis focuses on the synthesis of compounds expected to inhibit telomerase and provide potential for the treatment of cancer. Telomerase is a reverse transcriptase enzyme, which codes for telomeres and define the ends of chromosomes. Abnormal telomerase activity occurs in 85% of cancer cells and consequently has gained considerable interest as a target for cancer therapy. A natural product known as telomestatin can target G-quadruplexes and is shown to be very potent with activity at 5 nM. The aim of this thesis was to synthesise analogues of Telomestatin which contain a polyoxazole macrocycle. Chapter 1 discusses the enzyme telomerase and describes compounds which are able to inhibit its activity a literature survey on 2, 4-disubstituted oxazole chemistry is also described. Chapter 2 describes the attempted synthesis of a dipyridyltrisoxazole and a dipyridyl macrocycle. The synthetic approach involved the Hantzsch method to form oxazoles from amides and bromoketone. The Hantzsch method proved largely ineffective for obtaining the required oxazoles. A second approach involving the Willams-Wipf reaction was carried out to synthesise oxazoles. The procedure involved the cyclisation of L-serine methylester derived compounds with diethylaminosulfur trifluoride, followed by an oxidation reaction with 1,8- diazabicyclo 5.4.0 undec-7-ene and bromotrichloromethane. The Williams-Wipf approach helped to synthesise the half fragment required for the macrocycle. Chapter 3 involved the synthesis of a tetraoxazolylbipyridyl system. The Williams-Wipf approach was successful in delivering the half fragment of the desired system. However, the palladium cross coupling was ineffective in forming the tetraoxazolylbipyridyl system. Chapter 4 the aim was to synthesise a symmetrical octaoxazole ring system. The Willams-Wipf approach helped to develop the core structure to telomestatin which consists of five consecutive oxazole rings. A novel hepta oxazolyl ring system was also synthesised however, owing to insolubility of key intermediates the desired target could not be made.

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6

Tang, Pei. "Polyoxazoline derivatives for the design of polymer brushes and hydrogels". Thesis, Queen Mary, University of London, 2018. http://qmro.qmul.ac.uk/xmlui/handle/123456789/36700.

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Hydrophilic POx have very similar behaviour with PEG owing to its peptdomimetic structure, however, POx shows higher chemical stability than PEG and can be further functionalised via substitute R in the side chains or at the end of the chain. In addition, PEtOx has been approved as an indirect food additive by FDA which may indicate the possibility of good immunogenicity of POx-based materials. Synthetic surfaces with reproducibility and biocompatibility for in vitro cell culture offer lots of advantages on adherent cells. A variety of synthetic polymers as well as properties like mechanical and chemical robustness resulting polymer brushes prior to other surface modification methods. Synthetic hydrogels can be further modified and allow a variety of mechanical and biochemical properties that determine the cell phenotype which makes it a good candidate for biomedical applications. Our work has focused on the design of polyoxazolines with controlled end chains for the design of such hydrogels and polymer brushes. In the second chapter, we review the synthesis of defined polyoxazoline and its applications, synthesis of non-fouling surfaces, fabricated hydrogels and characterisations. In the third chapter, we explore the design of poly(2-oxazolines) with controlled end chains and characterise the structure and control of initiation and termination steps. A range of initiators (bromide, iodide as well as tosylates) and termination agents were used to introduce functionalisable or polymerisable end groups on poly(2-oxazolines). Microwave assisted synthesis was used for polyoxazoline synthesis. Polyoxazolines can be simply synthesized in relatively mild conditions using this approach. The structure of the resulting polymers is characterised by NMR, MALDI-ToF and FTIR. In the third chapter, we explore the use of polymerisable polyoxazolines for the design of grafted from polymer brushes. The growth of poly(oxazoline) brushes was studied first and the resulting polymer brushes characterised. We then explored the functionalization of polymer brushes using thiol-ene chemistry and their protein resistance for cell and protein patterning. Hence, we explored the design of polyoxazoline nonfouling coatings. These surfaces allow the control of surface properties such as protein adsorption and bio-functionalization. In the fourth chapter, we designed a series of thiolated poly(oxazolines) to be used for the design of hydrogels crosslinked via thiol-ene chemistry. We fully characterised the thiolated polymers designed and studied the formation of hydrogels using an alkene-functionalised polyoxazoline and a range of thiolated crosslinkers with polyethylene glycol and poly(oxazoline) backbones. Synthetic hydrogels have attracted much attention recently for in vitro cell culture as they allow the control of the properties of soft biomaterials (mechanics, cell adhesion, degradation). Importantly, the gelation conditions used for 3D cell encapsulation are essential as they allow controlling the mechanics and stability of the gel, whilst curing in mild, non-toxic conditions. Properties such as hydrogel chemistry, macroscopic and nanoscale mechanical properties and degradation have indeed been shown to strongly affect cell phenotype and the use of these materials for tissue engineering. To study gelation in situ, photo-rheology was used to characterise the properties and kinetics of the resulting hydrogels. Here, we investigated the formation of hydrogels with different multi-arm PEG thiols. This allowed us to improve the properties of hydrogel even at low weight concentration of materials where gelation is particularly challenging.

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7

Giardi, Chloé. "Synthèse de surfactifs à base de polyoxazoline : propriétés physicochimiques et formulation". Thesis, Montpellier, Ecole nationale supérieure de chimie, 2011. http://www.theses.fr/2011ENCM0008/document.

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Nous décrivons dans ce manuscrit la synthèse et l'étude de surfactifs à base de poly(2-méthyl-2-oxazoline) et de corps gras. Pour cela, deux voies de synthèse ont été réalisées. La première qui consiste à amorcer la polymérisation avec un alcool gras tosylé. La deuxième voie de synthèse a été réalisée en amorçant la polymérisation par un alcane iodé. Les surfactifs ainsi obtenus ont une chaîne grasse saturée ayant douze ou dix-huit atomes de carbone et des longueurs de chaînes polymères variables.Ces surfactifs sont examinés afin d'évaluer leur aptitude à la formulation. Ainsi, la valeur de leur concentration micellaire critique a été déterminée par tensiométrie et spectrofluorimétrie. Ensuite, l'évaluation de leurs pouvoirs mouillant et moussant, de leur HLB, de leur température de point de trouble… ont été déterminés afin de les comparer avec leurs homologues POE, les Brij®. Dans l'optique d'une application à la formulation, des tests d'évaluation de leur toxicité ont également été réalisés. Enfin, des préparations cosmétiques ont été formulées, à base de ces surfactifs et des Brij®. Parallèlement, une étude a été menée démontrant l'intérêt du carbonate de glycérol tosylé comme amorceur de la polymérisation de la 2-méthyl-2-oxazoline. Cet amorceur a permis de fonctionnaliser les polyoxazolines en extrémité de chaîne par des fonctions terminales (hydroxy)uréthane
In this manuscript, we describe the synthesis and the study of surfactants based on poly(2-methyl-2-oxazoline) and vegetable oil derivatives. Two ways for the synthesis are realized. The first path consists to initiate the polymerization with a tosylate fatty alcohol. The second synthetic route was realized by initiating the polymerization by an iodoalkane. The obtained surfactants have au saturated fatty chain with twelve or eighteen carbon atoms and various lengths of polymeric chain. This surfactants are reviewed to assess their suitability for the formulation. Thus, the value of their critical micelle concentration was determined by tensiometry and spectrofluorimetry. After, the evaluation of their wetting and foaming powers, their HLB, their cloud point temperature… was determinded in order to compare with their homologous POE, the Brij®. In the context of an application in the formulation, evaluation tests of toxicity were also made. Next, cosmetic preparations were realized, based on this surfactants and Brij®. In parallel, a study was conducted to demonstrate the tosylate gycerol carbonate interest as initiator in the 2-methyl-2-oxazoline polymerization. This initiator enable to fonctionalize the polyoxazoline in the chain end with (hydroxy)uréthane terminal function

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8

Korchia, Laetitia. "Auto-assemblage de copolymères amphiphiles photo-stimulables à base de polyoxazoline". Thesis, Montpellier, Ecole nationale supérieure de chimie, 2016. http://www.theses.fr/2016ENCM0005/document.

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Trois architectures de copolymères (dibloc, tribloc et hétérogreffé) amphiphiles photo-stimulables à base de polyoxazoline et de groupements photo-sensibles de type coumarine sont étudiées dans ce travail. Ces copolymères s’auto-assemblent en milieu aqueux sous forme de nanoparticules de morphologies sphériques, ovales mais également de nanofibres hélicoïdales de plusieurs micromètres de longueur. Selon les cas, les morphologies sont induites par de la cristallisation des motifs coumarine entre eux ou bien des interactions polyoxazoline-coumarine. Par ailleurs, la photo-réponse des nanoparticules a été examinée après irradiation UV des groupements coumarine, capables de dimériser de manière réversible selon la longueur d’onde utilisée. Elle diffère selon l’architecture du copolymère qui constitue les nanoparticules et donne lieu à des phénomènes de (pré-)photo-dimérisation ou photo-réticulation du cœur de celles-ci avec des réversibilités sous UV variables et un maximum d'efficacité dans le cas des copolymères triblocs. La stabilité de ces auto-assemblages a également été examinée avant et après exposition UV. Dans tous les cas, l’irradiation des nanoparticules améliore leur stabilité en température et dans le temps avec un effet maximal dans le cas de la pré-photodimérisation (tribloc). Enfin, la réticulation et la cristallisation se sont révélées être des freins au piégeage de molécules hydrophobes, illustrées ici avec le Nile Red, alors que les copolymères diblocs se sont révélés être les systèmes les plus efficaces. En somme, les nanoparticules de copolymères triblocs présentent le meilleur compromis entre stabilité, efficacité UV et piégeage
Three photo-responsive amphiphilic copolymer architectures (diblock, triblock and heterografted) based on polyoxazoline and coumarin photo-sensitive units are studied in this work. These copolymers self-assemble in water into spherical or ovalic nanoparticles and also supramicrometer helicoidal nanofibers. Depending on the macromolecular architectures, these morphologies are induced by crystallization of coumarin units or polyoxazoline-coumarin interactions. Moreover, the nanoparticle photo-response is examinated after the UV-exposure of coumarin units, that are able to reversibly dimerize according to the wavelength used. This photo-response varies with the copolymer structure and leads to (previous) photo-dimerization or photo-crosslinking phenomena. These latters present various photo-reversibility behaviors under UV and a maximal efficiency for triblock copolymers. The nanoparticle stability was additionally studied before and after UV-irradiation. In both cases, the nanoparticle stability is improved towards time and temperature with a maximal impact for the previous photo-dimerization (triblock). Finally, the crosslinking and the crystallization appear as brakes for the hydrophobic molecule entrapment, illustrated here by Nile Red, whereas diblock copolymers seem to be the most efficient systems. To conclude, previously photo-dimerized nanoparticles (triblock) are the best way combining stability, UV-efficiency and entrapment

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9

Förtig, Anton. "Monomolekulare Lipopolymerschichten zum Aufbau von biomimetischen Lipidmembranmodellen". [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=974170828.

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10

Bissadi, Golnaz [Verfasser], Ralf [Akademischer Betreuer] Weberskirch y Jörg C. [Gutachter] Tiller. "Polyoxazoline-silica hybrid nanoparticles / Golnaz Bissadi ; Gutachter: Jörg C. Tiller ; Betreuer: Ralf Weberskirch". Dortmund : Universitätsbibliothek Dortmund, 2016. http://d-nb.info/1126725013/34.

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