Thematische Bibliographien / Association of polymers

Inhaltsverzeichnis

  1. Zeitschriftenartikel
  2. Dissertationen
  3. Bücher
  4. Buchteile
  5. Konferenzberichte
  6. Berichte der Organisationen

Auswahl der wissenschaftlichen Literatur zum Thema „Association of polymers“

Autor: Grafiati
Veröffentlicht am 28. Juni 2021
Zuletzt aktualisiert am 9. Februar 2022

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Zeitschriftenartikel zum Thema "Association of polymers"

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Shi, Lei Ting, Zhe Na Shen, Wei Zhou, Zhong Bin Ye und Jun Feng Wang. „Study on the Performance of Hydrophobic Association Water-Soluble Polymer with Strong Association Ability“. Advanced Materials Research 418-420 (Dezember 2011): 232–36. http://dx.doi.org/10.4028/www.scientific.net/amr.418-420.232.

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In this article, the viscosifying abilities, rheological properties, and flow characteristics of hydrophobic association water-soluble polymer with high association ability were studied using technical methods of viscosity measurement, rheological and core flow experiments. The results illustrate that hydrophobic associated polymers with low molecular weight rely on a strong hydrophobic interaction, the intermolecular and intramolecular micellar structure formed in solution with a strong ability to increase viscosity. Hydrophobic association water-soluble polymer, comparing with partially hydrolyzed polyacrylamides polymer with low molecular weight, presents a better ability of shear stability under the condition of shearing and the solution structure strengthens gradually so as to increase viscoelasticity remarkably. The hydrophobic association water-soluble polymer with high association ability take on greater injectivity and mobility control ability in low permeability porous media solving the problem of low injectivity and poor control ability in mid-low permeability reservoirs, which improves polymers flooding effect in such reservoirs and underlie the reasonable design of polymer molecular structure.
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Shapiro, Karen, Colin Krusor, Fernanda F. M. Mazzillo, Patricia A. Conrad, John L. Largier, Jonna A. K. Mazet und Mary W. Silver. „Aquatic polymers can drive pathogen transmission in coastal ecosystems“. Proceedings of the Royal Society B: Biological Sciences 281, Nr. 1795 (22.11.2014): 20141287. http://dx.doi.org/10.1098/rspb.2014.1287.

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Gelatinous polymers including extracellular polymeric substances (EPSs) are fundamental to biophysical processes in aquatic habitats, including mediating aggregation processes and functioning as the matrix of biofilms. Yet insight into the impact of these sticky molecules on the environmental transmission of pathogens in the ocean is limited. We used the zoonotic parasite Toxoplasma gondii as a model to evaluate polymer-mediated mechanisms that promote transmission of terrestrially derived pathogens to marine fauna and humans. We show that transparent exopolymer particles, a particulate form of EPS, enhance T. gondii association with marine aggregates, material consumed by organisms otherwise unable to access micrometre-sized particles. Adhesion to EPS biofilms on macroalgae also captures T. gondii from the water, enabling uptake of pathogens by invertebrates that feed on kelp surfaces. We demonstrate the acquisition, concentration and retention of T. gondii by kelp-grazing snails, which can transmit T. gondii to threatened California sea otters. Results highlight novel mechanisms whereby aquatic polymers facilitate incorporation of pathogens into food webs via association with particle aggregates and biofilms. Identifying the critical role of invisible polymers in transmission of pathogens in the ocean represents a fundamental advance in understanding and mitigating the health impacts of coastal habitat pollution with contaminated runoff.
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Wei, Ming-Hsin, Boyu Li, R. L. Ameri David, Simon C. Jones, Virendra Sarohia, Joel A. Schmitigal und Julia A. Kornfield. „Megasupramolecules for safer, cleaner fuel by end association of long telechelic polymers“. Science 350, Nr. 6256 (01.10.2015): 72–75. http://dx.doi.org/10.1126/science.aab0642.

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We used statistical mechanics to design polymers that defy conventional wisdom by self-assembling into “megasupramolecules” (≥5000 kg/mol) at low concentration (≤0.3 weight percent). Theoretical treatment of the distribution of individual subunits—end-functional polymers—among cyclic and linear supramolecules (ring-chain equilibrium) predicts that megasupramolecules can form at low total polymer concentration if, and only if, the backbones are long (>400 kg/mol) and end-association strength is optimal. Viscometry and scattering measurements of long telechelic polymers having polycyclooctadiene backbones and acid or amine end groups verify the formation of megasupramolecules. They control misting and reduce drag in the same manner as ultralong covalent polymers. With individual building blocks short enough to avoid hydrodynamic chain scission (weight-average molecular weights of 400 to 1000 kg/mol) and reversible linkages that protect covalent bonds, these megasupramolecules overcome the obstacles of shear degradation and engine incompatibility.
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Schertzer, Jeffrey W., und Eric D. Brown. „Use of CDP-Glycerol as an Alternate Acceptor for the Teichoic Acid Polymerase Reveals that Membrane Association Regulates Polymer Length“. Journal of Bacteriology 190, Nr. 21 (19.08.2008): 6940–47. http://dx.doi.org/10.1128/jb.00851-08.

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ABSTRACT The study of bacterial extracellular polysaccharide biosynthesis is hampered by the fact that these molecules are synthesized on membrane-resident carrier lipids. To get around this problem, a practical solution has been to synthesize soluble lipid analogs and study the biosynthetic enzymes using a soluble system. This has been done for the Bacillus subtilis teichoic acid polymerase, TagF, although several aspects of catalysis were inconsistent with the results obtained with reconstituted membrane systems or physiological observations. In this work we explored the acceptor substrate promiscuity and polymer length disregulation that appear to be characteristic of TagF activity away from biological membranes. Using isotope labeling, steady-state kinetics, and chemical lability studies, we demonstrated that the enzyme can synthesize poly(glycerol phosphate) teichoic acid using the elongation substrate CDP-glycerol as an acceptor. This suggests that substrate specificity is relaxed in the region distal to the glycerol phosphate moiety in the acceptor molecule under these conditions. Polymer synthesis proceeded at a rate (27 min−1) comparable to that in the reconstituted membrane system after a distinct lag period which likely represented slower initiation on the unnatural CDP-glycerol acceptor. We confirmed that polymer length became disregulated in the soluble system as the polymers synthesized on CDP-glycerol acceptors were much larger than the polymers synthesized on the membrane or previously found attached to bacterial cell walls. Finally, polymer synthesis on protease-treated membranes suggested that proper length regulation is retained in the absence of accessory proteins and provided evidence that such regulation is conferred through proper association of the polymerase with the membrane.
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Okawa, Kaori, Jian Ping Gong und Yoshihito Osada. „Self-Propagating Association of Zwitterionic Polymers Initiated by Ionene Polymers“. Macromolecular Rapid Communications 23, Nr. 7 (01.04.2002): 423. http://dx.doi.org/10.1002/1521-3927(20020401)23:7<423::aid-marc423>3.0.co;2-f.

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Srebnik, Simcha. „Physical association of polymers with nanotubes“. Journal of Polymer Science Part B: Polymer Physics 46, Nr. 24 (15.12.2008): 2711–18. http://dx.doi.org/10.1002/polb.21605.

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Zhang, Zhijie, Chongwen Huang, R. A. Weiss und Quan Chen. „Association energy in strongly associative polymers“. Journal of Rheology 61, Nr. 6 (November 2017): 1199–207. http://dx.doi.org/10.1122/1.4997586.

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Quan, Xie, Su und Feng. „The Thermoviscosifying Behavior of Water-Soluble Polymer Based on Graft Polymerization of Pluronic F127 with Acrylamide and 2-Acrylamido-2-methylpropane Sulfonic Acid Sodium Salt“. Polymers 11, Nr. 10 (16.10.2019): 1702. http://dx.doi.org/10.3390/polym11101702.

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A new concept of thermoviscosifying polymers is proposed to address the problems about decreasing viscosity of polymer solution under high temperatures. However, existing thermoviscosifying polymers have complicated synthesis processes and high costs, and both of them restrict the wide practical applications of thermoviscosifying polymers. Although polyethers have the characteristics of thermal gelatinization, they just display thermoviscosifying behaviors only under extremely high concentrations (>15 wt %). Therefore, the graft copolymerization of the commercialized Pluronic F127 (PEO100-PPO65-PEO100) with acrylamide and 2-acrylamide-methylpropionic acid sodium salt was studied here. A series of graft modified polyether polymers were prepared and it was expected to get thermoviscosifying polymers with high molecular weights and low association temperatures. Several factors on thermoviscosifying behaviors were investigated, such as polymerization condition, polymer concentration, hydrophilic monomer, molecular structure and molecular weight. It was also proven that the apparent viscosity of polymer solution is influenced by polymer concentration, molecular weight of polymer, and content of anion groups.
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Donato, Ricardo K., und Alice Mija. „Keratin Associations with Synthetic, Biosynthetic and Natural Polymers: An Extensive Review“. Polymers 12, Nr. 1 (23.12.2019): 32. http://dx.doi.org/10.3390/polym12010032.

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Among the biopolymers from animal sources, keratin is one the most abundant, with a major contribution from side stream products from cattle, ovine and poultry industry, offering many opportunities to produce cost-effective and sustainable advanced materials. Although many reviews have discussed the application of keratin in polymer-based biomaterials, little attention has been paid to its potential in association with other polymer matrices. Thus, herein, we present an extensive literature review summarizing keratin’s compatibility with other synthetic, biosynthetic and natural polymers, and its effect on the materials’ final properties in a myriad of applications. First, we revise the historical context of keratin use, describe its structure, chemical toolset and methods of extraction, overview and differentiate keratins obtained from different sources, highlight the main areas where keratin associations have been applied, and describe the possibilities offered by its chemical toolset. Finally, we contextualize keratin’s potential for addressing current issues in materials sciences, focusing on the effect of keratin when associated to other polymers’ matrices from biomedical to engineering applications, and beyond.
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Peng, Yuankun, Tongkui Yue, Sai Li, Ke Gao, Yachen Wang, Ziwei Li, Xin Ye, Liqun Zhang und Jun Liu. „Rheological and structural properties of associated polymer networks studied via non-equilibrium molecular dynamics simulation“. Molecular Systems Design & Engineering 6, Nr. 6 (2021): 461–75. http://dx.doi.org/10.1039/d1me00017a.

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The physical polymer network formed by molecular association via non-covalent interactions between end groups alters a great many rheological properties of polymers and produces some fascinating rheological phenomena.
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Dissertationen zum Thema "Association of polymers"

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Moilanen, A. (Anu). „Self-association, compatibility, and strengthening behavior of liquid crystalline oligomers“. Doctoral thesis, University of Oulu, 1998. http://urn.fi/urn:isbn:9514250915.

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Abstract Synthetic routes were developed for the preparation of 2-alkoxy-4-hydroxybenzoic acids and 2-alkoxyhydroquinones, and a large-scale synthesis was developed for the preparation of 2-thioalkoxyhydroquinones. The 2-alkoxy-4-hydroxybenzoic acids, which contained alkyl side chains of different length, were used in the synthesis of new main chain liquid crystalline (LC) homo-, random, and block co-oligomers. In addition, oligomers of terephthaloyl chloride and 2-thioalkoxyhydroquinones and oligomers of terephthaloyl chloride and 2-alkoxyhydroquinones were produced. All the oligomers were blended with aliphatic polyamide 11 (PA 11). The effect of alkyl side chain length on the compatibility behavior of the LC oligomers towards the aliphatic polymer was characterized by DSC and FTIR, and the effect of side chain length on the flexural properties of the blends was investigated with a three-point bending test. The miscibility studies showed variable interfacial adhesion between the blended compounds. The strongest adhesion was achieved between PA 11 and the homo-oligomers of 2-alkoxy-4-hydroxybenzoic acids with short or medium long substituents (C4-C10), but the interactions between PA 11 and the oligomer with long aliphatic side chain (C18) were poor, as were those between PA 11 and the wholly aromatic oligomer of 4-hydroxybenzoic acid. The compatibility between PA 11 and the co-oligomers of 2-alkoxy-4-hydroxybenzoic acids was slightly lower than the compatibility of the corresponding homo-oligomers. DSC and FTIR analyses of the blends of oligomers of terephthaloyl chloride and 2-thioalkoxyhydroquinones and oligomers of terephthaloyl chloride and 2-alkoxyhydroquinones with PA 11 implied that the interactions between the blended compounds were poor. FTIR spectra and viscosity measurements confirmed that all the oligomeric structures could self-associate, with effect on the final mechanical properties of the polyamide. The strength of PA 11 in a three-point bending test was increased by the addition of only 1% of LC oligomers to the matrix. The results also showed that the strengthening ability of the oligomers is directly proportional to the total amount of aliphatic carbons. The best strengthening results were obtained with unsubstituted oligomers, random co-oligomers of 2-alkoxy-4-hydroxybenzoic acids, and homo-oligomer of 2-butoxy-4-hydroxybenzoic acid. DSC investigations of a ternary blend of the oligomer of 2-decanyloxy-4-hydroxybenzoic acid, PA 11, and wholly aromatic commercial LC polymer showed the promising compatibilizing effect of the oligomer.
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Lee, Chien-Ming. „Hydrogen-bonded main-chain liquid crystalline association polymers“. Thesis, University of Cambridge, 1994. https://www.repository.cam.ac.uk/handle/1810/272680.

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Wolnik, Anna. „Association des copolymères à séquences (1->4)-a-L-guluronane en présence d’ions calcium“. Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENV003/document.

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Les alginates forment des gels transparents en solution aqueuse en présence de certains ions divalents. Cette propriété est principalement attribuée à la formation de zones de jonction impliquant les séquences (1->4)-a-L-guluronane de chaînes adjacentes. Des oligomères d'alginates ont été utilisés comme briques élémentaires pour la synthèse de polymères biohybrides contenant des chaines pendantes oligo-(1->4)-a-L-guluronane. La rhéologie et la diffusion de la lumière ont permis d'étudier leur gélification ionotropique. De plus, une image atomistique des associations entre chaines latérales a été donnée grâce à la modélisation moléculaire et la microscopie de force atomique. Les polymères biohybrides portant des résidus pendant (1->4)-a-L-guluronane forment des gels en présence de Ca2+. L'addition de blocs guluronane ou mannuronane au gel préformé fait diminuer sa force avec quasiment la même efficacité. L'étude par dynamique moléculaire de séquences (1->4)-a-L-guluronan totalement chargées en présence d'ions Ca2+ suggère qu'environ 8 unités de répétition sont suffisantes pour former spontanément des zones de jonction. De plus, l'analyse conformationnelle de duplexes de chaines (1->4)-a-L-guluronane ayant 12 unités de répétition révèle une grande variété de conformations accessibles, ce qui est consistant avec la difficulté d'obtention de cristaux de Ca2+-guluronate de dimension suffisante pour les études cristallographiques. Les forces d'adhésion entre des homo-oligomères d'alginates en présence de Ca2+ mesuré par spectroscopie de force atomique montrent que la force d'interaction croit selon l'ordre suivant: M-M < M-G or G-M < G-G. Un résultat important est que les blocs mannuronanes, en complexe avec le calcium, peuvent être impliqués dans des associations homotypiques et hétérotypiques. Ce résultat est consistant avec la détection d'agrégats d'oligomères de mannuronanes observés en diffusion de la lumière pendant l'addition de CaCl2. Les blocs M contribuent donc également à la formation du gel mais la force associée est plus faible que celle des blocs G
Alginates form transparent hydrogels in aqueous solution upon addition of some divalent cations. This property is mostly due to the formation of junction zones involving (1->4)-a-L-guluronan sequences on adjacent polymer chains. Oligomers of alginates were used as molecular bricks for the synthesis of biohybrid polymers featuring (1->4)-a-L-guluronan sequences as side chains. Rheology and Light Scattering have been applied to investigate their ionotropic gelation. In addition, an atomistic picture of the Ca2+-driven side chain associations was also provided thanks to Molecular Modeling and Atomic Force Spectroscopy. Biohybrid polymers carrying (1->4)-a-L-guluronan residues formed soft and transparent hydrogels in the presence of Ca2+. The addition of either guluronan, or mannuronan blocks to the pre-formed gel reduced its strength almost with the same efficiency. A molecular dynamics investigation of fully charged (1->4)-a-L-guluronan sequences in the presence of a neutralizing amount of Ca2+ ions suggested that about 8 repeating units may be sufficient to the spontaneous formation of junction zones. Furthermore, conformational analysis of (1->4)-a-L-guluronan chain having 12 repeating units in duplexes revealed a wide variety of accessible conformations, a feature consistent with the general difficulty in obtaining crystals of Ca2+-guluronate with suitable lateral dimensions for crystallographic studies. The adhesion forces between homo-alginate oligomers in the presence of Ca2+ measured by Atomic Force Spectroscopy showed that the strength of interactions increased in the following order: M-M < M-G or G-M < G-G. One of the most significant findings to emerge from this study is that mannuronan blocks complexed via calcium ions can be involved in both homotypic and heterotypic associations. This result is consistent with the detection of aggregates observed for mannuronan oligomers by Light Scattering during the addition of CaCl2. Thus, M-blocks also contribute to the gel formation but their strength seemed to be however weaker than G-blocks
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Warwick, Michelle. „Association in mixed telechelic polymers through charge transfer interaction“. Thesis, Heriot-Watt University, 1995. http://hdl.handle.net/10399/741.

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Guo, Yachong. „Association of polymers and small solute molecules with phospholipid membranes“. Doctoral thesis, Universitat Rovira i Virgili, 2016. http://hdl.handle.net/10803/385852.

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El present treball està dedicat a les aplicacions pràctiques de diversos mètodes teòrics i de simulació incloent la dinàmica molecular, Montecarlo i la mitjana dels càlculs del camp per entendre les propietats físiques del sistema bicapa lipídica, així com la interacció dels objectes a escala nanomètrica en contacte amb lípids desenvolupament i bicapes. En particular, el treball es tracten els següents temes: 1. Optimització i equilibri de propietats bicapes lipídiques utilitzant única cadena de la teoria de camp mig. 2. El desenvolupament del model i estudiar les propietats d'equilibri de bicapes de lípids oxidats amb camp mitjà i els mètodes de dinàmica molecular 3. Estudi de les propietats d'equilibri de doble capa amb nanopartícules utilitzant camp mitjà i els mètodes de Montecarlo. Optimització de polímer translocacional través de la tècnica 5. Mètodes estadístics GPU membrana utilitzats per a les propietats superficials de micro fulles d'alteració bicapes lipídiques.
El presente trabajo está dedicado a las aplicaciones prácticas de varios métodos teóricos y de simulación incluyendo la dinámica molecular, Monte Carlo y la media de los cálculos del campo para entender las propiedades físicas del sistema bicapa lipídica, así como la interacción de los objetos a escala nanométrica en contacto con lípidos desarrollo y bicapas. En particular, el trabajo se tratan los siguientes temas: 1. Optimización y equilibrio de propiedades bicapas lipídicas utilizando única cadena de la teoría de campo medio. 2. El desarrollo del modelo y estudiar las propiedades de equilibrio de bicapas de lípidos oxidados con campo medio y los métodos de dinámica molecular 3. Estudio de las propiedades de equilibrio de bicapa con nanopartículas utilizando campo medio y los métodos de Monte Carlo. Optimización de polímero translocacional través de la técnica 5. Métodos estadísticos GPU membrana utilizados para las propiedades superficiales de micro cuchillas de alteración bicapas lipídicas.
Present work is devoted to the development and practical applications of several theoretical and simulation methods including Molecular dynamics, Monte Carlo and Mean field calculations to understand the physical properties of the lipid bilayer system as well as the interaction of nano-scale object in contact with lipid bilayers. In partcular, the work covers the following topics: 1. Optimization and equilibrium properties of lipid bilayers using Single Chain Mean Field theory. 2. Developing the model and study the equilibrium properties of bilayers with oxidized lipids with mean field and molecular dynamics methods 3. Study the equilibrium properties of bilayer with nanoparticles using mean field and Monte Carlo methods4. Optimization of translocational polymer through membrane GPU technique 5. Statistical methods used to the surface properties of micro blades disrupting lipid bilayers.
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Rivera-Tirado, Edgardo. „Association and Fragmentation Characteristics of Biomolecules and Polymers Studied by Mass Spectrometry“. University of Akron / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=akron1196728741.

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Harding, Paul David. „A study of the relationship between water, water soluble polymers and their interpolymer association complexes“. Thesis, Heriot-Watt University, 1998. http://hdl.handle.net/10399/1164.

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Lagomarsini, Clara. „Contribution à la conception de générateurs hybrides souples : association de matériaux électro-actifs“. Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT001/document.

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Ces dernières années, les capteurs embarqués ont gagné en précision, fiabilité et robustesse, tout en se miniaturisant. Ces capteurs sont largement utilisés dans le domaine médical et sportif pour récolter toutes sortes de données physiologiques. Développer des générateurs d’énergie qui convertissent l’énergie mécanique ambiante en électricité constitue une voie très intéressante afin de rendre ces capteurs autonomes.Dans ce contexte, en 2013, un premier générateur souple autonome d’énergie a été développé au sein de notre équipe au G2Elab en collaboration avec le laboratoire LaMCoS. Ce générateur est conçu à partir d’élastomères électroactifs, basés sur la déformation de matériaux souples (polyacrylates, silicones) incorporés entre deux électrodes déformables et fonctionnent suivant un mode électrostatique. Ces structures présentent l’avantage d’être légères, peu chères, souples et elles peuvent être fabriquées suivant des géométries complexes. De plus, elles fonctionnent dans des gammes de fréquence basses (<100 Hz), les rendant ainsi attractives pour la récupération et la conversion d’énergie mécanique ambiante.L’objectif de ce travail de thèse était d’optimiser ce générateur pour en faire un générateur de seconde génération plus performant en terme d’énergie récupérée, beaucoup plus adaptable sur le corps humain et avec une durée de vie accrue. Pour atteindre ces différents critères, la conception et la réalisation de nouveaux dispositifs alternatifs hybridés pour des générateurs autonomes ont également été menées.Pour cela, la première étape a consisté à chercher un nouveau matériau pouvant remplacer le téflon comme électret dans la structure. Cet électret joue le rôle de réservoir de charges pour la polarisation du générateur fonctionnant en mode électrostatique. Le choix s’est porté sur plusieurs familles de poly(p-xylylene) plus communément appelées parylènes. Le fait de pouvoir les déposer dans un procédé CVD sur des géométries complexes et de façon très conforme a justifié ce choix. Le comportement temporel du potentiel de surface développé par ces électrets après une décharge couronne a été analysé en fonction du type et de l’épaisseur de parylène et du potentiel initial de charge. Cela a permis d’évaluer les potentialités en électret de ces matériaux et de mieux cerner la dynamique des charges électriques dans un environnement proche de l’application (sous contrainte mécanique) et pour des conditions plus extrêmes en température. Ces travaux ont permis de valider des parylènes fluorés comme d’excellents électrets (tests réalisés sur 1.5 an) tant en potentiel positif que négatif.La seconde étape s’est focalisée dans la conception de structures développant une architecture qui optimise les couplages électromécaniques au sein des matériaux constituant le générateur souple d’énergie. Dans ce but, et avec l’appui de modélisations que nous avons réalisées pour définir les géométries optimales de nos structures pour maximiser la puissance produite en sortie, deux principes de fonctionnement se sont dégagés : le premier fait appel à des électrets et il est ainsi en étroite continuité de l’étude précédente ; le second utilise des matériaux piézoélectriques (PZT et PVDF) comme source de polarisation ouvrant ainsi une nouvelle voie prometteuse de générateurs autonomes embarqués. Pour ces différentes structures, des prototypes de taille centimétrique ont été réalisés et caractérisés avec pour but final d’être insérés au niveau du genou pour récupérer la déformation mécanique lors de la marche ou de la course à pied
Over the last years, wearable sensors have gained in accuracy and precision, while following the demands of miniaturization and lower power consumption. Scavenging human kinetic energy to produce electricity is an attractive alternative for the power supply of these low-power-consumption devices. E-textiles for health-monitoring or biomedical implants are some of the possible applications that could benefit from a self-powering system.In this context, in 2013, a first prototype of soft and autonomous energy scavenger was developed by our research group through the collaboration between LaMCoS and G2Elab laboratories. This electrostatic generator was based on the dielectric elastomers generators (DEGs) technology, which relies on the mechanical deformation of a thin layer of dielectric material (acrylic or silicone) sandwiched between two compliant electrodes. The main advantages of this technology are their low-cost, compliance, light-weight and adaptability to complex shapes. In addition, they can work on a large scale of temperatures and frequencies (<100Hz), which make them interesting to harvest and convert ambient mechanical vibrations.The objectives of this work were focused on the first prototype optimization to realize a second-generation device with higher energy output, suitability for wearable applications and lifetime and to conceive new alternatives hybrid devices for autonomous DEGs.To these aims, the first stage of the study consisted in the investigation of new conformant electret materials (representing the charges reservoir for electrostatic generator polarization) replacing Teflon in the scavenger structure. Different variants of poly(p-xylylene) polymers, better known with the commercial name of Parylene, were tested as new potential electret materials, mainly due to their highly conformability and possibility of CVD-deposition on complex shapes. The surface potential decays (SPD) on electrets formed by corona discharge method were monitored over time for different Parylene variants, samples thicknesses and charging voltages. These characterizations were aimed to evaluate the performance of Parylene electrets and to monitor the charge dynamic under mechanical conditions close to the final applications and under harsher environmental temperatures. As a result of these tests, fluorinated Parylenes showed excellent long-term charge retention performance (over 1.5 years) both for positive and negative charges.The second part of the work consisted in the realization of optimized structures realizing the electromechanical coupling of the two different electroactive materials constituting the soft electrostatic generator. For this aim, two different working modes were developed: the first one employs electret materials as polarization source, with the aim of optimizing the first hybrid device conceived in the previous study; the second one is made of piezoelectric materials (PZT and PVDF) as DEGs polarization sources, opening a new promising solution for autonomous wearable generators. Through numerical simulations, geometry optimization was performed with the aim of increasing the power output of the devices. Beneath, for the different structures, centimeter scale prototypes were realized and characterized with the final aim to be integrated at human knee level to exploit the mechanical deformation given by human body while walking
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Ridell, Annika. „Characterisation of Aqueous Solutions, Liquid Crystals and Solid State of Non-ionic Polymers in Association with Amphiphiles and Drugs“. Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ-bibl. [distributör], 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3607.

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Charifou, Romina. „Optimisation des propriétés barrière de matériaux polymères par association avec des composés inorganiques pour des applications biomédicales : influence des approches nanocomposites et dépôts de couches minces siliciées“. Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10263/document.

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De par leur faible coût, leurs propriétés mécaniques ajustables et leur potentielle transparence, les matériaux polymères sont des candidats de choix pour le packaging biomédical. Cependant, il est souvent nécessaire d'améliorer leurs propriétés barrière à O2 et H2O afin de garantir une conservation optimale du produit conditionné. Dans ce contexte, l'approche choisie a été d'associer une phase inorganique à la matrice polymère. Ainsi, après un choix des systèmes polymères les plus adaptés aux conditionnements pharmaceutiques souples d'une part et rigides d'autre part, nous avons étudié deux voies d'optimisation des propriétés barrière : le dépôt de couches minces organosiliciées à la surface du polymère et la voie nanocomposites. Le but est d'établir pour ces deux types de systèmes hétérogènes les relations Structure/Morphologie/Propriétés. Le dépôt de couches minces organosiliciées a été effectué par le procédé de dépôt chimique en phase vapeur assisté par plasma. Nous avons étudié deux types de monocouches, la première de type céramique SiOx et l'autre de type SiCH. La combinaison de ces couches sous forme d'empilements sur le substrat polymère permet, outre l'augmentation conséquente des propriétés barrière, une meilleure conservation des propriétés fonctionnelles sous des sollicitations de type thermique ou mécanique. Les nanocomposites ont été préparés par voie fondu à partir d'un poly(propylène) et de charges oxyde de zinc ou doubles hydroxydes lamellaires. Nous avons étudié les effets d'un agent compatibilisant et de modifications de surface des charges. Les propriétés barrière sont reliées à l'état de dispersion des charges et aux interactions charges/matrice
Due to their good handling properties, potential transparency and low cost, polymers are key components for the biomedical industry. However, high barrier properties towards gases or vapors are required for packaging applications in order to retain the quality of the product. To achieve the improvements in barrier properties of polymers, two different ways based on the combination of an inorganic phase with the polymer material were studied. The aim was to establish Structure/Morphology/Properties relationships. Thin inorganic coatings deposited on polymer substrates are of particular interest for improving barrier properties. In the current work, thin transparent silicon based layers were deposited on flexible polymer films by plasma-enhanced chemical vapor deposition. Monolayers (SiOx type and SiCH type) and piles with an alternation of these different monolayers were studied. The interest of multilayer barrier coatings was highlighted for higher barrier properties and resistance to solicitations such as thermal treatment or mechanical deformation. The second approach consisted in preparing poly(propylene) based nanocomposites with inorganic nanoparticles such as zinc oxide and layered double hydroxides. The transport properties of these materials depend on the quality of the filler dispersion in the polymer, but also on the interface between the fillers and the polymer matrix. Thus, the influence of a compatibilizer and of the nanoparticle surface modification was investigated on the properties of the nanocomposites
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Bücher zum Thema "Association of polymers"

1

Polymer Physics: Applications to Molecular Association and Thermoreversible Gelation. Cambridge: Cambridge University Press, 2011.

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L, Erusalimskiĭ B., Hrsg. Polifunkt͡s︡ionalʹnostʹ init͡s︡iirui͡u︡shchikh sistem s soedinenii͡a︡mi perekhodnykh metallov v prot͡s︡essakh polimerizat͡s︡ii. Leningrad: Izd-vo "Nauka," Leningradskoe otd-nie, 1985.

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El-Nokaly, Magda A., Hrsg. Polymer Association Structures. Washington, DC: American Chemical Society, 1989. http://dx.doi.org/10.1021/bk-1989-0384.

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Glass, J. Edward, Hrsg. Associative Polymers in Aqueous Media. Washington, DC: American Chemical Society, 2000. http://dx.doi.org/10.1021/bk-2000-0765.

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Deng, Nan-Jie. Association and electrorheological behaviour of polymer solutions. Manchester: University of Manchester, 1994.

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Sadeghy-Dalivand, Kayvan. Viscoelastic behaviour of associative polymer solutions. Ottawa: National Library of Canada = Bibliothèque nationale du Canada, 1996.

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Siekierski, Maciej. Composite polymeric electrolytes: Mesoscale models and ion associations = Kompozytowe elektrolity polimerowe : modele mezoskalowe i asocjacje jonowe. Warszawa: Oficyna Wydawnicza Politechniki Warszawskiej, 2012.

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1937-, Glass J. E., und American Chemical Society. Division of Polymeric Materials: Science and Engineering., Hrsg. Polymers in aqueous media: Performance through association. Washington, DC: American Chemical Society, 1989.

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Glass, J. E. Polymers in Aqueous Media: Performance Through Association (Advances in Chemistry Series). An American Chemical Society Publication, 1989.

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Frca. FRCA: Fire Retardant Engineering Polymers and Alloys (The Fire Retardant Chemicals Association). CRC, 1989.

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Buchteile zum Thema "Association of polymers"

1

Gooch, Jan W. „Composites Manufacturing Association“. In Encyclopedic Dictionary of Polymers, 161. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_2749.

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Gooch, Jan W. „Association Constant (K)“. In Encyclopedic Dictionary of Polymers, 875. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_13182.

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Gooch, Jan W. „Chi-square Test of Association“. In Encyclopedic Dictionary of Polymers, 973. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_15176.

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Gooch, Jan W. „National Association of Corrosion Engineers“. In Encyclopedic Dictionary of Polymers, 478. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_7789.

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Gooch, Jan W. „Suppliers of Advanced Composite Materials Association“. In Encyclopedic Dictionary of Polymers, 715. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_11425.

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Gooch, Jan W. „National Association of Printing Ink Manufacturers (NAPIM)“. In Encyclopedic Dictionary of Polymers, 478. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_7790.

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Wenz, Gerhard, Meik Weickenmeier und Jürgen Huff. „Association Thickener by Host—Guest Interaction of β-Cyclodextrin Polymers and Guest Polymers“. In ACS Symposium Series, 271–83. Washington, DC: American Chemical Society, 2000. http://dx.doi.org/10.1021/bk-2000-0765.ch016.

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Finkelmann, H., und E. Jahns. „Association and Liquid Crystalline Phases of Polymers in Solution“. In ACS Symposium Series, 1–20. Washington, DC: American Chemical Society, 1989. http://dx.doi.org/10.1021/bk-1989-0384.ch001.

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Boury, Bruno. „Self-Association in Hybrid Organic-Inorganic Silicon-Based Material Prepared by Surfactant-Free Sol-Gel of Organosilane“. In Silicon Based Polymers, 233–46. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-8528-4_17.

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Akiyoshi, Kazunari, Yoshihiro Sasaki, Kenichi Kuroda, Atushi Ueminami und Junzo Sunamoto. „Controlled Association of Macromolecules in Water: Hydrophobized Polymers and Proteins“. In Molecular Interactions and Time-Space Organization in Macromolecular Systems, 151–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-60226-9_16.

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Konferenzberichte zum Thema "Association of polymers"

1

Azad, Madhar Sahib, und Japan J. Trivedi. „Injectivity Behavior of Copolymer and Associative Polymers Decoded Using Extensional Viscosity Characterization: Effect of Hydrophobic Association“. In SPE Western Regional Meeting. Society of Petroleum Engineers, 2017. http://dx.doi.org/10.2118/185668-ms.

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Wu, Si. „Red-light-responsive Ru-containing polymers for deep-tissue biomedical applications (Conference Presentation)“. In 17th International Photodynamic Association World Congress, herausgegeben von Tayyaba Hasan. SPIE, 2019. http://dx.doi.org/10.1117/12.2525181.

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Lebal, N., H. Hallil, C. Dejous, B. Plano, A. Krstulja, R. Delepee, D. Rebiere und L. A. Agrofoglio. „Association of a Love wave sensor to thin film molecularly imprinted polymers for nucleosides analogs detection“. In 2013 8th IEEE International Conference on Nano/Micro Engineered and Molecular Systems (NEMS). IEEE, 2013. http://dx.doi.org/10.1109/nems.2013.6559790.

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Alexis, Dennis, Dwarakanath Varadarajan, Do Hoon Kim, Greg Winslow und Taimur Malik. „Evaluation of Innovative Associative Polymers for Low Concentration Polymer Flooding“. In SPE Improved Oil Recovery Conference. Society of Petroleum Engineers, 2016. http://dx.doi.org/10.2118/179696-ms.

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Alexis, D., D. Varadarajan, D. H. Kim, G. Winslow und T. Malik. „Evaluation of Innovative Associative Polymers for Low Concentration Polymer Flooding“. In IOR 2017 - 19th European Symposium on Improved Oil Recovery. Netherlands: EAGE Publications BV, 2017. http://dx.doi.org/10.3997/2214-4609.201700315.

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Hunziker, E. B., P. W. Straub und A. Haeberli. „AN INTERLOCKING SINGLE-STRAND MODEL FOR FIBRIN POLYMERIZATION.“ In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643315.

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The early stages of fibrin polymerization were investigated by rotatory shadowing and electron microscopy. Individual molecules within initial oligomers were found to be unaligned and contacted neighbouring molecules by single E + D and D + E contacts, suggesting an intermediate phase of activation (des A-fibrin). The interacting molecular domains were separated by a distance of 2 to 3 nm, indicating that (both or at least one) binding sites are located on protruding segments of the polypeptide chains. Upon completion of fibrin activation (des AA-fibrin), molecules within the early oligomers aligned to form single-stranded polymers,o these being characterized by repeating trinodular units of 230 A in length. Based upon these findings, a new interlocking single-stranded model for fibrin polymerization was designed and tested. The model is consistent with previous experimental data on fibrin polymerization such as that obtained by X-ray diffraction and negative staining. Moreover, early branching and lateral association phenomena are easily explained.
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Wassmuth, Fred Rolf, Ken Green und Jen Bai. „Associative Polymers Outperform Regular Polymers Displacing Heavy Oil in Heterogeneous Systems“. In SPE Heavy Oil Conference Canada. Society of Petroleum Engineers, 2012. http://dx.doi.org/10.2118/157916-ms.

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Aktas, Fitiz, Torsten Clemens, Louis M. Castanier und Anthony Robert Kovscek. „Viscous Oil Displacement via Aqueous Associative Polymers“. In SPE Symposium on Improved Oil Recovery. Society of Petroleum Engineers, 2008. http://dx.doi.org/10.2118/113264-ms.

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Taylor, K. C., und H. A. Nasr-El-Din. „Hydrophobically Associating Polymers for Oil Field Applications“. In Canadian International Petroleum Conference. Petroleum Society of Canada, 2007. http://dx.doi.org/10.2118/2007-016.

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Thomas, A., N. Gaillard, C. Favero, J. Bai, K. Green und F. Wassmuth. „Performance of Associative Polymers in Porous Media“. In IOR 2013 - 17th European Symposium on Improved Oil Recovery. Netherlands: EAGE Publications BV, 2013. http://dx.doi.org/10.3997/2214-4609.20142625.

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Berichte der Organisationen zum Thema "Association of polymers"

1

Laurence, Jeffrey. Antibody to the RNA-Dependent DNA Polymerase of HTLV-III: Characterization and Clinical Associations. Fort Belvoir, VA: Defense Technical Information Center, März 1990. http://dx.doi.org/10.21236/ada231466.

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Laurence, Jeffrey. Antibody to the RNA-Dependent DNA Polymerase of HTLV-III: characterization and Clinical Associations. Fort Belvoir, VA: Defense Technical Information Center, Juli 1988. http://dx.doi.org/10.21236/ada227404.

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Laurence, Jeffrey. Antibody to the RNA-Dependent DNA Polymerase of HTLV-III: characterization and Clinical Associations. Fort Belvoir, VA: Defense Technical Information Center, Dezember 1988. http://dx.doi.org/10.21236/ada227519.

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