Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"methacrylates"”.
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Carbohydrate Mediation of Aqueous Polymerizations: Cyclodextrin Mediation of Aqueous Polymerizations of Methacrylates
Cyclodextrin mediation offers a unique mechanism with the potential for interesting control of reaction parameters. Cyclodextrin mediation of hydrophobic monomers may offer desirable kinetics over conventional free radical polymerizations, and it has been shown in this work that cyclodextrin …
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Novel Carbazole Based Methacrylates, Acrylates, and Dimethacrylates to Produce High Refractive Index Polymers
… and copolymers produced from aromatic based methacrylates, acrylates, and dimethacrylates are excellent materials with many applications in dentistry, microelectronics, and optics, including optical eye wear, fiber optics, and non-linear optics, such as holography. Carbazole based polymers …
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Synthesis and controlled radical polymerization of multifunctional monomers
… The ATRP of multifunctional acrylates and methacrylates has been successfully performed, as well as the block copolymerization of multifunctional acrylates and methacrylates. Relatively low polydispersities of the corresponding polymers (PD=1.18-1.36) and reasonably high rates of …
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Novel hydrogel copolymers and semi-interpenetraing polymer networks
… have been synthesised using a variety of methacrylates and acrylates. Hydrogels were obtained by the addition of N-vinyl pyrrolidone to these copolymers. A selection of interpenetrants were incorporated into the samples and their effect on the copolymer properties was investigated. By …
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Study of the dilute solution properties of various homo- and block co-polymers by variable temperature size exclusion chromatography
… solution properties of a series of poly(alkyl methacrylates) with varying side alkyl(ester) group were investigated as to the effect of the size of the side group on the average chain dimensions at various temperatures. The VTSEC results were found to reveal that the effect of the side group …
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Michael addition of amines to α-ß unsaturated esters
… esters was acrylates > maleates > fumarates > methacrylates.</p> <p>A polar concerted mechanism with six-member cyclic transition state for the nucleophilic attack of amine on the Michael acceptor followed by protic medium assisted enol-keto tautomerization to yield the final product was …
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Anionic synthesis and characterization of alkyl methacrylate containing polymeric systems
The anionic synthesis of alkyl methacrylates has received sparse attention in comparison to the synthesis of nonpolar hydrocarbon monomers such as styrene or the dienes. The two major reasons for the sluggish synthetic development of this class of polar monomers are the protic impurities present in …
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Dielectric studies of novel polymeric systems
… included some stereospecific poly(alkyl methacrylates) which were synthesized anionically. In this series the alkyl group was systematically changed in order to study the effects of the bulkiness of the substituent and the tacticity on the a and ß transitions. The ß transition associated …
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Development of functional hydrogels for sensor applications
… has been set up with oligo ethylene glycol methacrylates. This allows to tune the lower critical solution temperature (LCST) of the polymers in aqueous media. The molar masses are variable thanks to the excurse taken in polymerization in ionic liquids thus stretching molar masses from 25 to …
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Novel hydrogel polymers
… some less hydrophilic hydroxyalkyl acrylates and methacrylates have been synthesised. Variations in structure and composition have been correlated both with the total equilibrium water content of the resultant hydrogel and with the more detailed water binding behaviour, as revealed by differential …
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Synthetic polymers for ophthalmic applications
… oxygen permeabilities of relatively simple alkyl methacrylates, show that butyl methacrylate which has a permeability some fifty times greater than PMMA, represents an interesting and hitherto unexplored group of materials for ophthalmic applications. Consideration was similarly given to surface …
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Dendronized Amphiphilic Copolymers Synthesized from Methacrylate Derivatives as Potential Topical Microbicides
… with alkyl (methyl, ethyl, and n-butyl) methacrylates. Copolymer composition correlated well with monomer feed; Mns of 3–10K g/mol were observed. Ionizable polymers were achieved via acidolysis with trifluoroacetic acid; significant increases in Tg were observed. For the copolymers, the …
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Structure-property relationships of electron beam cured systems containing bis-GMA
… more reactive in EB cured systems than analogous methacrylates probably due to their higher polymerization enthalpy and less steric hindrance. Phase separation, which would provide rubber toughening without depressing the high glass transition temperature, was not achieved by irradiation with the …
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Synthesis, Characterization and Properties of Vinyl Ester Matrix Resins
… reactivity ratios of styrene and terminal methacrylates on vinyl ester oligomers were calculated to be rs = 0.36 ± 0.05 and rm = 0.24 ± 0.1 from early conversion data obtained at 140°C on a series of resins with systematically increasing levels of styrene. The composition data were analyzed …
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Synthesis and characterization of well-defined methacrylic-based block ionomers
… other hand, all of the diene- and styrene/diene-methacrylates exhibited a multiphase morphology in the precursor state. Analogously to the all methacrylic system, the block ionomers were elastomeric, with the rubbery plateau extended ca. 60 °C relative to the non-ionic precursors. Crosslinking of …
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New inverse hydogel opals as protein responsive sensors
… from the family of oligo(ethylene glycol)methacrylates. The monomer solution was injected into a polymerisation mould, which contained the colloidal crystals as a template. The space in-between the template particles was filled with the monomer solution and the hydrogel was cured via …
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Molecular design of ordering transitions in block copolymers
… from styrene and a homologous series of n-alkyl methacrylates (PS-b-PnAMA, n ranging from 1 to 12) was investigated, both as a function of pressure and temperature. The results of this study reveal an unexpected, though systematic, dependence of the phase behavior of these BCP's on monomer …
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Force-induced mechanochemical reactions in polymeric systems
… masked as a disulfide) and poly(glycidyl methacrylates), a polymer with an epoxy side chain. Success in the demonstration of the epoxide ring-opening chemistry by the unmasked thiol side chained polymer, lays down a foundation for future research steps, involving the development of this …
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Examining Structure-Morphology-Property Relationships of Novel Styrenic-Based Macromolecules for Emerging Applications
… that acrylates have lower activation energy than methacrylates. The copolymerizations of poly(ethylene glycol)methyl ether acrylate (EG9MEA) and imidazole-containing monomer (VBIm) resulted in controlled polymerization kinetics with narrow molecular weight distributions. The control behavior of …
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DEVELOPMENT OF CRISPR-CAS IMMOBILIZATION SRATEGIES FOR THE FABRICATION OF A BIOSENSING PLATFORM
… succinimide (NAS) and 3(Trimethoxysylil propyl) methacrylates (MAPS). By post-polymerization modification of the succinimide moieties, different groups which enable click-chemistry reactions were inserted into the polymer chains. These click groups allow crosslinking of the polymer chains forming …
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