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Dissertations / Theses on the topic 'Polybutadienes'

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Published: 4 June 2021

Last updated: 12 April 2025

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1

Roberts, Caroline. "Studies on telechelic cationomeric polybutadienes." Thesis, Heriot-Watt University, 1990. http://hdl.handle.net/10399/851.

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2

Tait, Stephen. "Preparation and study of functionalised hydrogenated polybutadienes." Thesis, Heriot-Watt University, 1994. http://hdl.handle.net/10399/1351.

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3

Morgovan, Ariana Claudia. "Crystallisation studies of novel architecture hydrogenated polybutadienes." Thesis, University of Sheffield, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.445115.

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4

Pondicherry, Narayanan. "Polycarboxylic acids via catalytic hydrocarboxylation of polybutadienes." Thesis, University of St Andrews, 1992. http://hdl.handle.net/10023/15259.

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Polybutadiene having varying degrees of 1,4 and 1,2 units (0 - 100% cis, 14 - 60 % trans, 20-88 % pendant carbon-carbon double bonds) have been reacted with carbon monoxide in the presence of water and palladium based catalysts to give new polymers in which the double bonds are hydrocarboxylated. When using [PdCl2(PPh3)2]/SnCl2 as catalysts, very high regiospecificities can be obtained with only the double bonds pendant from the chain being hydrocarboxylated. When using PdCl2 as catalyst, in the presence of CuCl2 and O2, hydrocarboxylation takes place both at the pendant carbon-carbon double bonds and back bone carbon-carbon double bonds. Complete hydrocarboxylation of all the carbon-carbon double bonds in polybutadiene can be carried out by sequential catalytic reaction i.e., catalysis by [PdCl2(PPh3)2]/SnCl2 followed by (recatalysis) [PdCl2(PPh3) 2]/PPh3. A new method based on 1H and 13C n.m.r. has been developed to characterise polybutadienes and their hydrocarboxylated products. The hydrocarboxylation reaction catalysed by [PdCl2(PPh3) 2]/SnCl2 is truly homogeneous although catalytic decomposition is a problem because there exists a small temperature window between the onset of catalysis and the onset of catalytic decomposition. Unlike the starting materials the products, which are solids with melting points well above the room temperature are soluble in organic solvents or dilute base and have been shown to have corrosion inhibition and wood preservation properties.

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5

Pryke, Andrew. "The synthesis and physical characterisation of well-defined linear and star polydienes." Thesis, University of Sheffield, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324446.

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6

Makan, Ashwell Craig. "Asymmetric flow field flow fractionation (AF4) of polymers with focus on polybutadienes and polyrotaxanes." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/19997.

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Thesis (MSc)-- Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Over the past two decades, field flow fractionation (FFF), as a polymer characterization technique, has become cutting edge technology. The demand for molar mass and size characterisation of complex polymer systems has increased, especially in cases where classical calibration techniques such as size exclusion chromatography (SEC) has shown several shortcomings. FFF is a technique resembling chromatography. It has several significant advantages over SEC, especially for the characterisation of ultrahigh molar mass (UHMM), branched and gel-containing polymers. In this study, polybutadienes, which often contain the abovementioned species, were analysed by SEC and asymmetric flow field flow fractionation (AF4). Both separation techniques were coupled to refractive index and multi-angle laser light scattering detection. Similarly, polyrotaxanes, which are polymers with complex and unique molecular architectures, were also investigated. Results showed that AF4 can explicitly be used as a superior tool over SEC. In the case of UHMM polybutadienes, much higher molar masses could be detected by AF4, due to the absence of shear degradation which is often encountered in SEC. Gel-containing species could be detected by AF4 as no filtering is required prior to injection. Abnormal retention behaviour, a phenomenon often encountered in UHMM branched polymers, was observed in SEC analysis of the polyrotaxanes materials. AF4 provided sufficient separation from low to high molar masses, without out any irregularities.<br>AFRIKAANSE OPSOMMING: Gedurende die afgelope twee dekades het veldvloeifraksionering (FFF) as ‘n polimeerkarakteriseringstegniek groot veld gewen. Die aanvraag na molekulêre massa en groottekarakterisering van komplekse polimeersisteme het toegeneem, veral in die gevalle waar klassieke kalibrasietegnieke soos grootte-uitsluitingschromatografie (SEC) etlike tekortkominge getoon het. FFF is ‘n tegniek soortgelyk aan chromatografie, en het voorheen bewys dat dit oor ‘n redelike aantal voordele bo SEC beskik, veral in die geval van ultrahoë molekulêre massa- (UHMM-), vertakte- en jelbevattende spesies. In die huidige studie is polibutadieenpolimere, wat dikwels bogenoemde spesies bevat, geanaliseer met behulp van SEC en onsimmetriese vloei-veldvloeifraksionering (AF4). Beide skeidingstegnieke is gekoppel aan ‘n brekingsindeks en multihoek-laserligverstrooiingsdetektors. Op dieselfde wyse is polirotaksane (polyrotaxanes) met komplekse molekulêre argitektuur bestudeer. Daar is bewys dat AF4 uitsluitlik gebruik kan word as ‘n meer geskikte tegniek bo SEC. Baie hoër molekulêre massas kon deur middel van AF4 vir UHMM polibutadieenpolimere raakgesien word as gevolg van die verminderde afbrekende degradasie wat dikwels voorkom met SEC. Jel-bevattende spesies is suksesvol geïdentifiseer met behulp van AF4 waartydens geen filtrering vir analise nodig was nie. Abnormale retensie was sigbaar tydens SEC analise van monsters van polirotaksane, wat dikwels voorkom in vertakte polimere. In teenstelling het AF4 bewys dat ‘n bevredigende skeiding van klein na groot molekulêre massas, sonder enige tekortkominge, moontlik is.

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7

Jürgens, Hannes [Verfasser], and Gerrit A. [Akademischer Betreuer] Luinstra. "Post Modification of Liquid Polybutadienes and Their Rheological Properties / Hannes Jürgens ; Betreuer: Gerrit A. Luinstra." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2019. http://d-nb.info/1182537855/34.

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8

KIANFAR, PARNIAN. "Nanofibrous polymeric membranes by coupling electrospinning and photo-induced crosslinking." Doctoral thesis, Politecnico di Torino, 2022. http://hdl.handle.net/11583/2959953.

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9

Kabir, Mohammad Rakibul [Verfasser]. "Correlation between Morphology and Mechanical Properties of Polystyrene-b-Polybutadiene-b-Poly(methyl methacrylate) in Dependency of the Polybutadiene's Block Microstructure / Mohammad Rakibul Kabir." Kiel : Universitätsbibliothek Kiel, 2011. http://d-nb.info/1020245689/34.

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10

Krushev, Stephan. "Computersimulationen zur Dynamik und Statik von Polybutadienschmelzen." [S.l.] : [s.n.], 2002. http://ArchiMeD.uni-mainz.de/pub/2002/0113/diss.pdf.

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11

Ruhland, Klaus. "Quantitative Beschreibung des metathetisch erreichten Kettenaufbau/Kettenabbau-Gleichgewichts im 1,4-Polybutadien-(bzw. Cyclobuten- )System." [S.l. : s.n.], 1998. http://www.sub.uni-hamburg.de/disse/33/inhalt.html.

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12

Ekanayake, Piyasiri. "Orientation and dynamics of unfilled and filled poly(butadiene) networks studied by deuterium NMR." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=960682554.

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13

Li, Si Wan. "Rheology of branched polybutadiene - modeling polydispersity." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=86830.

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A series of linear and H-shaped polybutadienes (PBDs) were prepared by living anionic polymerization. These polymers were prepared in a novel way using a DPE derivative instead of a difunctional initiator to prepare the cross-bar. This new synthesis strategy was designed to reduce the presence of intermediate species and undesired by-products in the final samples. Details of the structures were revealed using temperature gradient interaction chromatography (TGIC) and the results were compared with those indicated by size exclusion chromatography (SEC) data from reputable researchers at three laboratories. Discrepancies in molecular weights and molecular weight distributions were observed amongst the three sets of SEC data. Furthermore, TGIC, which is believed to have a higher resolution than SEC, revealed that the H-shaped PBDs were actually mixtures of components having several molecular structures. Rheological characterizations were carried out over a broad frequency range by combining small amplitude oscillatory shear (SAOS) and creep (and recovery in some cases) data. Time-temperature superposition was found to work well at temperatures ranging from -75oC to 25oC, and dynamic moduli inferred from creep (or creep/recovery) data agreed well with the SAOS data at the reference temperature Tref=25oC. Material constants including the zero shear viscosity , plateau modulus and steady state compliance were extracted from experimental data. The effects of long-chain branching and polydispersity of arms and cross-bars on rheological behavior were studied. Two tube-based models: The Hierarchical-3.0 model developed by Larson et al. and the branch-on-branch (BoB) model of Das et al. were evaluated and compared quantitatively. The evaluation consisted of a summary of peer reviews, sensitivity and uncertainty analyses and comparison of simulations with experimental data. Hierarchical-3.0 gave the most accurate predictions for the H-shaped polymers when polydispersity in t<br>Des polybutadiènes linéaires et à structure branchée en « H » (avec deux points de branchement) ont été synthétisés par polymérisation anionique en utilisant un dérivé du diphényle-éthylène à la place d'un amorceur bi-fonctionnel pour synthétiser le segment connectant les deux points de branchement. Cette nouvelle approche a permis de réduire le nombre de produits intermédiaires et de structure moléculaires indésirables dans les échantillons produits. Une comparaison de la structure moléculaire déterminée par une méthode chromatographique à gradient de température (TGIC) avec les résultats de trois études indépendantes par chromatographie d'exclusion (SEC) réalisées par des experts en la matière a révélé des différences, en particulier parmi les résultats de SEC. La méthode TGIC, jugée plus précise et sensible, a établi que les échantillons de polybutadiène « H » étaient un mélange de structures diverses. Le comportement rhéologique sur une large gamme de fréquences a été déterminé en combinant des données dynamiques à faible amplitudes avec des donnés de fluage. Le principe de superposition temps-température a été validé entre -75°C et 25°C, et le module complexe déduit des données de fluage-recouvrance est en bon accord avec le module directement mesuré dans le mode oscillatoire à la température de référence (25°C), ce qui a permis la détermination de la viscosité au plateau Newtonien, du module et de la complaisance à l'équilibre. L'influence de la présence de longues branches et de la polydispersité des branches et du segment entre les points de branchement a été étudiée, et les données rhéologiques ont été utilisées pour évaluer deux modèles théoriques basés sur la théorie de la reptation. Le modèle hiérarchique « Hierarchical-3.0 » développé par Larson et al., et le modèle BoB (« branch-on-branch ») proposé par Das et al. ont été comparés sur la base d

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14

Wickard, Todd DeVere. "The First Attachment and Post-Functionalization of Polybutadiene and Thio-Click Functionalized Polybutadiene on H-Terminated Si(111)." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/2035.

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I report the attachment of polymers with pendant vinyl groups to hydrogen-terminated silicon(111) (Si(111)-H) under mild conditions. 1,2-addition polybutadiene (Mw 3200-3500) was attached to Si(111)-H at room temperature with visible light. I also report the partial functionalization, in solution, of 1,2-addition polybutadiene with various thiols using thiol-click chemistry. These compounds bind to Si(111)-H via visible light activation. The partially functionalized polybutadienes allow further functionalization at the surface through unreacted carbon-carbon double bonds. Surfaces were characterized with contact angle goniometry, spectroscopic ellipsometry, X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (ToF-SIMS), and atomic force microscopy (AFM).

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15

Wang, Ting. "Degradation and stabilisation of diisocyanate cured polybutadiene." Thesis, Aston University, 1992. http://publications.aston.ac.uk/9792/.

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Hydroxyl terminated polybutadiene (HTPB) has been used as a rocket propellant binder which is required to be stored for at least twenty years. It is found that the excellent stress-strain characteristics of this propellant can be totally lost, during this long storage, due to the deterioration of the polybutadiene chains. As a result, the propellant can not stand the service loads, which may lead to a catastrophe. The study of the HTPB binder degradation, below 80°C, has been carried out by investigating the environmental factors and the changes which occur along the macromolecular chains. Results have shown that oxygen is the main factor which causes the crosslinking and chain scission reactions. The former is the predominant reaction and proceeds rapidly under oxygen sufficient environment. The unsaturation of polymer chain, which provides the desired physical properties to the binder, was lost with the increase in crosslink density. At the same time hydroperoxides were found to form and decompose along the polymer chains. Therefore, the deterioration of the binder results from the oxidation of polymer chains. Since the oxidation reaction occurred at higher rate than oxygen diffusion rate and oxygen diffusion rate is inversely proportional to the crosslink density, the binder, below the surface layer in a thick section container, could be naturally protected under an oxygen deficient condition for a long time. Investigation of the effectiveness of antioxidants in HTPB binder has shown that the efficiency of an antioxidant depends on its ability to scavenge radicals. Generally, aromatic amines are the most effective binder antioxidants. But when a peroxide decomposer is combined with an aromatic amine at the appropriate ratio, a synergistic effect is obtained, which gives the lowest binder gel increase rate.

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16

Scott, Simon M. "Stabilisation of isocyanate cross linked polybutadiene binder." Thesis, Aston University, 1998. http://publications.aston.ac.uk/9606/.

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Isocyanate cross-linked hydroxy terminated polybutadiene is used as a binder for solid rocket propellant. Rocket motors containing this propellant require a storage life of at least 20 years. During storage it has been found that the important rubbery properties of the binder can be lost due to oxidative cross-linking of the polybutadiene chains. This could cause catastrophic failure when the rocket motor is required. At present the bis-hindered phenol Calco 2246 is used as a thermal oxidative stabiliser, but it's performance is only adequate. This has led to the search for a more efficient stabiliser system. To hasten the evaluation of new antioxidant systems the use of dynamic thermal analysis was investigated. Results showed that a tentative relationship existed between predictions by thermal analysis and the long term oven ageing for simple single antioxidant systems. But for more complex systems containing either autosynergistic or mixed antioxidants no relationship was observed suggesting that results for such an "accelerated" technique cannot be used for the purpose of extrapolation for long term performance. This was attributed to the short time and more aggressive condition used (hjgher temperature and oxygen rich atmosphere in thermal analysis) altering the mechanism of action of the antioxidants and not allowing time for co-operative effect of the combined antioxidant system to form. One potential problem for the binder system is the use of an diisocyanate as a cross-linking agent. This reacts with the hydroxyl hydrogen on the polymer as well as other active hydrogens such as those contained in a number of antioxidants, affecting both cross-linking and antioxidant effectiveness. Studies in this work showed that only antioxidants containing amine moieties have a significant affect on binder preparation, with the phenolic antioxidants not reacting. This is due to the greater nucleophilicity of the amines. Investigation of a range of antioxidant systems, including potentially homo, hetero and autosynergistic systems, has highlighted a number of systems which show considerably greater effectiveness than the currently used antioxidant Calco 2246. The only single antioxidant which showed improvement was the partially unhindered phenol y-Tocopherol. Of the mixed systems combinations of the sulphur containing antioxidants e.g. DLTP with higher levels of chain-breaking antioxidants, especially Calco 2246, were the most promising. Also the homosynergistic mix of an aromatic amine and a phenol was seen to be very effective but the results were inconsistent. This inconsistency could be explained by the method of sample preparation used. It was shown that the efficiency of a number of antioxidant.s could be dramatically improved by the use of ultrasound during the mixing stage of preparation. The reason for this increase in performance is unclear but in the case of the homosynergistic amine/phenol mix both more efficient mixing and/or the production of a novel mechanism of action are suggested.

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17

Conrad, Cathrin Sonja. "Polybutadien und Butadien enthaltende Copolymere mit gezielt eingebauten vulkanisierbaren Gruppen durch RAFT-Polymerisation." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2013. http://hdl.handle.net/11858/00-1735-0000-0022-5E9E-D.

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Die RAFT-Polymerisation ("Reversible Addition-Fragmentation Chain Transfer") ist eine radikalische Polymerisation, die auf dem Prinzip des degenerativen Kettentransfers basiert. Es können Polymere hergestellt werden, die eine niedrige Dispersität aufweisen und komplexe makromolekulare Strukturen ausbilden. Für die Funktionalisierung von Polymerketten bietet sich die RAFT-Polymerisation ebenfalls an, da idealerweise jede auf diese Art hergestellte Polymerkette eine RAFT-Einheit trägt und so eine vollständige Funktionalisierung gewährleistet ist. Im Fokus dieser Arbeit stand die Funktionalisierung von Polybutadien und 1,3-Butadien enthaltenden Copolymeren mit gezielt eingebauten schwefelhaltigen Gruppen. Dabei wurden zwei verschiedene Ansätze verfolgt: Die α,ω-Funktionalisierung der Polymerketten mittels modifizierter RAFT-Agenzien sowie eine Funktionalisierung entlang der Polymerkette mit Hilfe von speziellen Monomeren. Da diese Polymere in technischen Anwendungen Verwendung finden sollen, standen einfache Synthesen, die sich gut auf den Technikums- und Industriemaßstab übertragen lassen, im Vordergrund. Da es sich bei der RAFT-Einheit auch um eine schwefelhaltige Gruppe handelt, wurden Strategien zur Funktionalisierung der Abgangsgruppe erarbeitet und experimentell untersucht, um so ein α,ω-funktionalisiertes Polymer zu erhalten. Neben klassischen RAFT-Agenzien wurden auch neuartige Makro-RAFT-Agenzien verwendet, bei denen die schwefelhaltige Gruppe während einer Polymerisation in situ angebunden wird. Darüber hinaus konnten erfolgreich Monomere synthetisiert werden, die wegen ihrer styrolähnlichen Struktur und der Ähnlichkeit der Monomere Styrol und 1,3-Butadien in ihrem Polymerisationsverhalten gut mit 1,3-Butadien copolymerisieren und dabei die schwefelhaltige Gruppe entlang der Polymerkette einbauen. Das Hauptaugenmerk weiterer Untersuchungen lag auf den Copolymerisationseigenschaften der Monomere. Dazu wurden umfangreiche Untersuchungen mit Styrol als Modellsystem für 1,3-Butadien durchgeführt und die gewonnenen Erkenntnisse in einer Copolymerisation der funktionalisierten Monomere mit 1,3-Butadien verifiziert. Es konnte weiterhin gezeigt werden, dass sich schaltbare RAFT-Agenzien für die Synthese von Poly(butadien)-block-poly(vinylacetat) eignen, obwohl es sich um zwei Monomere mit stark unterschiedlichen elektronischen Eigenschaften handelt, die in einer konventionellen radikalischen Polymerisation kein Copolymer bilden würden. Aufgrund der Ähnlichkeit der Monomere Vinylacetat und Ethylen eröffnet dies neue Wege in der kontrollierten radikalischen Polymerisation von Polybutadien-block-polyethylen und erweitert so das Spektrum der unpolaren Monomere in der RAFT-Polymerisation zur Herstellung von Blockcopolymeren.

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18

Solar, Mathieu, Leonid Yelash, Peter Virnau, Kurt Binder, and Wolfgang Paul. "MD simulations of 1,4 - polybutadiene at graphite surfaces." Diffusion fundamentals 20 82013) 101, S. 1, 2013. https://ul.qucosa.de/id/qucosa%3A13690.

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19

Solar, Mathieu, Leonid Yelash, Peter Virnau, Kurt Binder, and Wolfgang Paul. "MD simulations of 1,4 - polybutadiene at graphite surfaces." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-183938.

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20

Kohnle, Maria-Verena. "Synthese von Polydien- und Polydien-Copolymernanopartikeln mittels Miniemulsionsverfahrens." [S.l. : s.n.], 2008. http://nbn-resolving.de/urn:nbn:de:bsz:289-vts-66310.

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21

Berger, Luzius. "Untersuchungen zum rheologischen Verhalten von Polybutadienen mit bimodaler Molmassenverteilung /." Zürich, 1988. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=8662.

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22

Swanson, Nicole. "Polybutadiene Graft Copolymers as Coupling Agents in Rubber Compounding." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1473158881.

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23

Buschnakowski, Matthias. "Phasenseparations- und Deformationsverhalten von mikrostrukturierten Polystyrol - Polybutadien Blockcopolymerblends." kostenfrei, 2009. http://nbn-resolving.de/urn:nbn:de:gbv:3:4-346.

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24

Forens, Pierre-Antoine. "Tuning polybutadiene microstructure using multi-metallic initiation systems by anionic polymerization." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0312.

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L’objet de ces travaux de thèse est d’étudier la synthèse de polybutadiène au moyen de systèmes d’amorçage multi-métalliques. L’utilisation d’alcoolates de potassium en association avec des dérivés d’alkyllithium a été étudiée afin d’obtenir du polybutadiène de façon contrôlée avec 50% d’unités vinyliques en milieu apolaire. Dans un second temps, ces travaux démontrent que des systèmes d’amorçage sans lithium permettent la synthèse de polybutadiène par voie anionique. Lorsque le dialkylmagnesium est associé à un alcoolate de potassium, il permet l’obtention de polybutadiène avec 50% d’unités vinyliques, alors que le système dialkylmagnesium / alcoolate de baryum permet la synthèse de polybutadiène à fort taux de 1,4-trans (65%)<br>The goal of this research work is to find original ways to obtained polybutadiene with defined microstructure by developing multimetallic initiation systems. The aim of the first experimental chapter was to obtain polybutadiene with a 50% vinyl content in a controlled way in apolar media. This objective was achieved by using a bimetallic system based on potassium alkoxide and alkyllithium. The goal of the last experimental chapter was to prospect multimetallic initiation systems allowing obtention of polybutadiene without using lithium derivatives. The use of dialkylmagnesium in association with potassium alkoxide was found relevant to produce polybutadiene with a 50% vinyl content, while the association of dialkylmagnesium and barium alkoxide allows the synthesis of polybutadiene with a high 1,4-trans content (up to 65%)

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25

Nir, Moira Marx. "Blend of crystallizable polybutadiene isomers : compatibilization by addition of amorphous diblock copolymer." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13034.

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26

Breton, Beatrice. "Polybutadiene hydroxytelechelique, polycondensation tridimentionnelle en masse avec des polycyanates : relations, structure, propriétes." Lyon, INSA, 1994. http://www.theses.fr/1994ISAL0115.

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L'objectif de cette étude est la synthèse et la caractérisation de polyuréthanes (PU) obtenus en masse à partir de polybutadiène hydroxytéléchélique radicalaire (PBHT) et de polyisocyanates. Dans un premier temps, nous nous sommes attachés à la microstructure du prépolymère et nous avons mis en évidence trois fonctions alcool majoritaires de même que des structures minoritaires. Avec une fonctionnalité en nombre en hydroxyle de 2,7, ce PBHT a un indice de polydispersité en fonctionnalités proche de 1. La polycondensation en masse de ce PBHT avec un diisocyanate à différents rapports stoechiométriques r (NCO/OH) a été étudiée et les gels gonflés de PU ont été examinés quantitativement par RMN 13C. A l'approche du point de gel (PG), la vitesse de réaction diminue fortement : à cause de la réticulation croissante, la polycondensation est régie uniquement par un phénomène de diffusion et les conversions sont limitées. Du fait des cyclisations et du piégeage de sites réactifs, les conversions critiques (pc) sont toujours supérieures à celles calculées par la relation de Flory- Stockmayer, cet écart est maximal pour r proche de l'unité. L'étude de propriétés physiques (taux de gonflement et de gel, relaxation magnétique transversale des protons) montrent que le maximum de l'état de contrainte est obtenu pour r proche de un et que le taux de branchement (Pc2/r) est une variable pertinente pour décrire tout état de gélification. Le suivi de la réticulation par rhéologie à différentes fréquences de cisaillement montre, qu'à l'approche du PG, une faible augmentation de la conversion entraîne une importante variation des propriétés viscoélastiques. La température de transition vitreuse des PU est reliée au taux de ségrégation de phase et à la densité de réticulation, elle dépend aussi de la nature du polyisocyanate et de l'ajout d'un allongeur de chaîne<br>The topic of this study is the synthesis and the characterisation of polyurethanes (PU) obtained in bulk from hydroxytelechelic polybutadiene (HTPB) and polyisocyanates. First, the microstructure of prepolymer is studied and three principal primary alcohol functions are found as well as minor structures. With an hydroxyl number-average functionality of 2. 7, the polydispersity index in functionalities of this HTPB is close to one. The bulk polycondensation of HTPB with diisocyanate with various stoechiometric ratios r (NCO/OH) is studied and swollen PU - gels were quantitatively examined by 13C NMR. Near the gel [point (GP), reaction rates drastically decrease : because of the increasing gelation, polycondensation should only be governed by diffusion phenomena and conversions are limited. Because of cyclisation and reacting groups trapping, critical conversions (pc) are always larger than those calculated by using the Flory - Stockmayer relation, the difference is maximum for r's near one. Measurements of viscoelastic properties (swelling and gelation ratios, transverse magnetic relaxation of protons) show that the maximum of topological constraints is observed for r near one and the branching ratio (pc2/r) is a relevant variable for describing ali gelation states. Reticulation, at different shear frequencies, followed by rheology shows that near the GP a small increase of conversion causes important variation of viscoelastic properties. Glass transition temperature of PU is dependent of the degree of phase separation and reticulation density, the nature of polyisocyanate and the presence of chain extender

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27

Ploetz, Christopher Daniel. "Micelles of polybutadiene-b-poly(ethylene oxide) in a binary solvent system." College Park, Md. : University of Maryland, 2008. http://hdl.handle.net/1903/8310.

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Thesis (M.S.) -- University of Maryland, College Park, 2008.<br>Thesis research directed by: Dept. of Chemical and Biomolecular Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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28

Krantz, Nicolas. "Application de la réaction d'hydrosilylation à la modification chimique d'un polybutadiene hydroxytelechelique." Paris 13, 1986. http://www.theses.fr/1986PA132004.

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Rappels sur les méthodes de modification chimique des polymères insatures; la réaction d'hydrosilylation; synthèse des molécules hydrosilyles: multiet polyethers silanes; étude cinétique du greffage; caractérisation structurale de pbht modifies; caractérisation des propriétés physiques des polymères modifiés: transition vitreuse, conductivité des polyurethannes, resistivité des pbht modifiés

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29

Frébourg, Philippe. "Mélanges noir de carbone-polybutadiène : étude par RMN du proton, extraction et gonflement." Université Joseph Fourier (Grenoble), 1994. http://www.theses.fr/1994GRE10205.

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Les systemes etudies sont constitues d'agregats de noir de carbone n220 interconnectes par des chaines polybutadiene absorbees a leur surface. Nous les caracterisons par extraction, rmn et gonflement. Les mesures du taux de polymere residuel apres extraction et la modelisation de l'adsorption par la percolation nous permettent d'estimer la proportion de chaines faiblement fixees et desorbees lors du sejour en solvant. D'autre part, les proprietes rmn de ces systemes conduisent a une caracterisation fine de la statistique d'adsorption sur differentes echelles d'espace: au niveau de l'interface charge-polymere, nous mettons en evidence une proportion de monomeres adsorbes remarquablement faible, de l'ordre de 2%. Au niveau de l'interphase, nous montrons que la structure en boucles des chaines adsorbees depend fortement de l'histoire des echantillons. En fin d'extraction et avant sechage cette structure est tres lache et le nombre de points d'absorption par chaine est independant de leur longueur. Par contre, apres sechage l'interphase s'est densifiee de facon irreversible et ce nombre devient proportionnel a la racine carree de la longueur des chaines. Enfin, le gonflement, decrit dans l'approche en champ moyen de flory, apporte des informations complementaires sur la texture des melanges. L'ensemble des resultats experimentaux obtenus conduit a une representation globale et coherente de l'organisation microscopique de ces systemes

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30

Korthals, Brigitte [Verfasser]. "Nanoparticles of Polybutadiene with Unconventional Microstructures and their Post-Polymerization Modification / Brigitte Korthals." Konstanz : Bibliothek der Universität Konstanz, 2010. http://d-nb.info/1017236089/34.

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31

Uther, Jim Christoph [Verfasser], and Gerrit A. [Akademischer Betreuer] Luinstra. "Partly hydrogenated and functionalized polybutadiene rubber / Jim Christoph Uther ; Betreuer: Gerrit A. Luinstra." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2018. http://d-nb.info/1163013676/34.

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32

Kippenbrock, Grant. "Purification of Tadpole-Shaped Polystyrene Precursor and Investigation of Silyl Hydride-Functionalized Polybutadiene." University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1586863602288104.

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33

Djahieche, Abder-Rahim Mechin Françoise Pascault Jean-Pierre. "Synthèse in situ de microparticules polyuréthane par polyaddition interfaciale dans un monomère époxyde application comme renforts de réseaux époxyde-amine /." Villeurbanne : Doc'INSA, 2006. http://docinsa.insa-lyon.fr/these/pont.php?id=djahieche.

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34

Jeličić, Aleksandra, Alwin Friedrich, Katarina Jeremić, Gerd Siekmeyer, and Andreas Taubert. "Polymer hydrogel/polybutadiene/iron oxide nanoparticle hybrid actuators for the characterization of NiTi implants." Universität Potsdam, 2009. http://opus.kobv.de/ubp/volltexte/2010/4858/.

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One of the main issues with the use of nickel titanium alloy (NiTi) implants in cardiovascular implants (stents) is that these devices must be of very high quality in order to avoid subsequent operations due to failing stents. For small stents with diameters below ca. 2 mm, however, stent characterization is not straightforward. One of the main problems is that there are virtually no methods to characterize the interior of the NiTi tubes used for fabrication of these tiny stents. The current paper reports on a robust hybrid actuator for the characterization of NiTi tubes prior to stent fabrication. The method is based on a polymer/hydrogel/magnetic nanoparticle hybrid material and allows for the determination of the inner diameter at virtually all places in the raw NiTi tubes. Knowledge of the inner structure of the raw NiTi tubes is crucial to avoid regions that are not hollow or regions that are likely to fail due to defects inside the raw tube. The actuator enables close contact of a magnetic polymer film with the inner NiTi tube surface. The magnetic signal can be detected from outside and be used for a direct mapping of the tube interior. As a result, it is possible to detect critical regions prior to expensive and slow stent fabrication processes.

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35

Johns, M. D. "The characterisation and properties of dimethylamine-terminated polybutadiene polymers and their alkyl iodine salts." Thesis, Lancaster University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373810.

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36

Thompson, Thaddeus. "Rheological Study of Linear and Nonlinear Viscoelastic Behavior for Silica-Reinforced Polybutadiene and Polystyrene." University of Akron / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=akron1134566032.

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37

Lugadet-Pe, Françoise. "Modification chimique de polymères polyinsaturés : étude de la nitration et de l'azidation de polybutadiennes hydroxytéléchéliques." Bordeaux 1, 1988. http://www.theses.fr/1988BOR10599.

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La nitration des polybutadienedihydroxy a ete effectuee par nitromercuration, l'azidation par iodoazidation deioduration. Les polymeres modifies sont caracterises au plan de leur structure et de leurs proprietes physiques

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38

Lugadet-Pe, Françoise. "Modification chimique de polymères polyinsaturés étude de la nitration et de l'azidation de polybutadiènes hydroxytéléchéliques /." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb376154466.

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39

CORNIC, DIDIER. "Etude spectroscopique de la modification du polybutadiene cis 1-4 par la para-nitrosophenyl aniline." Paris 6, 1990. http://www.theses.fr/1990PA066460.

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L'etude spectroscopique de la reaction entre la para-nitrosophenyl aniline (pnpa) et le polybutadiene cis 1-4 (br) a ete realisee. La degradation et la ramification des chaines sont accompagnees par l'apparition de derives aromatiques greffes et non greffes et la formation d'especes radicalaires. Un mecanisme reactionnel est propose

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40

Ding, Leiyuchuan. "Modification of High trans-Polybutadiene Copolymer and Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) with Nano Fillers." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1377875542.

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41

Henry, Isabelle Pascault Jean-Pierre. "Synthèse et polymérisation de polyuréthanes acrylates à base de polybutadiène hydroxytéléchélique morphologie et propriétés /." Villeurbanne : Institut national des sciences appliquées de Lyon, 1998. http://csidoc.insa-lyon.fr/these/1998/henry/index.html.

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42

Oishi, Yohei. "Dynamics and structure of polybutadienyl lithium living anionic chains aggregated in non-polar solvent." 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/136259.

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43

Sendorek, Jerzy George. "Rheological properties of long-chain branched chlorinated poly(isobutylene-co-isoprene)-graft-polybutadiene terpolymers (CIIR-g-BR)." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0008/NQ30643.pdf.

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44

Rana, Muhammad Akmal. "Solid-state carbon-13 and proton NMR imaging studies of the accelerated-sulfur cured high vinyl polybutadiene." Case Western Reserve University School of Graduate Studies / OhioLINK, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=case1056651729.

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45

venoor, varun. "Investigation of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)/Natural Rubber blends and Polystyrene/Polybutadiene Silica Nano-Composites." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492725718211967.

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46

Peterson, Zachary W. "Closed-Loop Thrust and Pressure Profile Throttling of a Nitrous Oxide/Hydroxyl-Terminated Polybutadiene Hybrid Rocket Motor." DigitalCommons@USU, 2012. https://digitalcommons.usu.edu/etd/1400.

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Hybrid motors that employ non-toxic, non-explosive components with a liquid oxidizer and a solid hydrocarbon fuel grain have inherently safe operating characteristics. The inherent safety of hybrid rocket motors offers the potential to greatly reduce overall operating costs. Another key advantage of hybrid rocket motors is the potential for in-flight shutdown, restart, and throttle by controlling the pressure drop between the oxidizer tank and the injector. This research designed, developed, and ground tested a closed-loop throttle controller for a hybrid rocket motor using nitrous oxide and hydroxyl-terminated polybutadiene as propellants. The research simultaneously developed closed-loop throttle algorithms and lab scale motor hardware to evaluate the fidelity of the throttle simulations and algorithms. Initial open-loop motor tests were performed to better classify system parameters and to validate motor performance values. Deep-throttle open-loop tests evaluated limits of stable thrust that can be achieved on the test hardware. Open-loop tests demonstrated the ability to throttle the motor to less than 10% of maximum thrust with little reduction in effective specific impulse and acoustical stability. Following the open-loop development, closed-loop, hardware-in-the-loop tests were performed. The closed-loop controller successfully tracked prescribed step and ramp command profiles with a high degree of fidelity. Steady-state accuracy was greatly improved over uncontrolled thrust.

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47

Morandi, Gaëlle Fontaine Laurent. "Synthèse de copolymères greffés par combinaison de polymérisation radicalaire par transfert d'atome (ATRP) et de polymérisation par ouverture de cycle par métathèse (ROMP)." [S.l.] : [s.n.], 2007. http://cyberdoc.univ-lemans.fr/theses/2007/2007LEMA1012.pdf.

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Silva, de Araújo Márcia. "Étude de la modification de la ténacité de composites thermoplastiques de cellulose et de polybutadiène /." Thèse, Trois-Rivières : Université du Québec à Trois-Rivières, 2001. http://www.uqtr.ca/biblio/notice/resume/03-2228956R.html.

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49

Maier, Thomas Robert. "The effects of polymer microstructure and macrostructure on SBR/polybutadiene blend miscibility, phase morphology, and cured rubber properties." Case Western Reserve University School of Graduate Studies / OhioLINK, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=case1061908392.

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50

Ge, Sirui. "The Entanglement-Disentanglement Transition (EDT) During Creep With Either Constant Or Oscillatory Stress In Highly-Entangled Polybutadiene Solution." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1459949733.

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