Global ETD Search
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Showing 1 to 13 of 13 for “"cyclic carbonate"”.
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From cyclic carbonate bifunctional couplers to amphiphilic poly(ethylene imine)s
… mostly bearing at least one five-membered ring carbonate. These bifunctional couplers were suitable for the selective combination of two functional primary amines. Via addition or substitution reactions of bifunctional couplers with functional amines, functional couplers with different …
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Synthese funktionalisierter Polycarbonate auf cis-1,4-But-2-endiol-Basis
… with the synthesis and the properties of polycarbonates based on cis-1,4- but-2-endiol and different carbonic acid derivates. Statistical and alternating Copolymers were obtained through polycondensation of different dioles and carbon acid derivates. The synthesis of block copolymers have been …
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'Quat-Primer' polymers based on b-PEI and their application in composites
… reaction of various functionalized five-membered cyclic carbonates and epoxides couplers with branched polyethylenimine (b-PEI). Furthermore, depending on the functionality introduced in the polymer, the application of these modified polymers (i) as primers in carbon fibre - epoxy resin composite …
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High Pressure NMR Studies of Supercooled Viscous Fluids
… coupling parameter. It was shown for the cyclic carbonate system, 4-methyl-1,3-dioxolan-2-one, 4-chloro-1,3-dioxolan-2-one, and 4,5-dichloro-1,3-dioxolan-2-one, that the permanent dipole plays a important role in determining the rotational-translational coupling. Using constant reduced …
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Reversibly Photo-Crosslinkable Polycarbonate-Based Polymersomes for Drug Encapsulation and Delivery
… from poly(ethylene glycol)-block-polycarbonate (PEG-PC) copolymers functionalized with pendant coumarin groups. Coumarin groups undergo photo-reversible dimerization when irradiated with specific ultraviolet wavelengths, so they can be used to prepare polymers with photo-responsive …
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Development of polyurethane-like materials based on proteins
… properties to the final materials. For that, a cyclic carbonate (BCC) was firstly reacted with lysine and small peptides to confirm the formation of the urethane linkage and optimize reaction conditions. Subsequently, different amounts of BCC were combined with ELP and the obtained materials …
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Cyclostratigraphy of Late Cambrian cyclic carbonates: An interbasinal field and modelling study, U.S.A.
An interbasinal study of Late Cambrian cyclic carbonate successions in the Appalachian and Cordilleran passive margins, the Texas cratonic embayment and the southern Oklahoma aulacogen has provided controls on the simultaneous development of peritidal to subtidal meter-scale cycles and the larger …
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Multi-functional polymers from polyamines and functional five-membered cyclic carbonates
… reaction of functional five-membered cyclic carbonates with polyamines. The functionality of the polymers defines their properties and their application: multi-functional poly(ethylene imine)s for antimicrobial polymer and primer polymer for textile finishing were prepared. The main …
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SOLID-SUPPORTED PORPHYRINS FOR CATALYSIS AND SENSING
… and aziridines to synthesize respectively cyclic carbonates and oxazolidinones. In order to enhance the catalytic activity without losing the eco-compatibility of the catalyst, hemin-derivatives were supported onto CC, which displays very good eco-friendly characteristics due to their …
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Cracking Meldrum's Acid: Lowering the Temperature
… for their capacity to form ketenes through cyclic carbonate and cyclic thiocarbonate intermediates. The synthesised malonic acids were analysed through thermogravimetric analysis experiments. It was found that the two dialkynyl malonic acids decarboxylated readily and possessed a different …
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Cracking Meldrum's Acid: Lowering the Temperature
… for their capacity to form ketenes through cyclic carbonate and cyclic thiocarbonate intermediates. The synthesised malonic acids were analysed through thermogravimetric analysis experiments. It was found that the two dialkynyl malonic acids decarboxylated readily and possessed a different …
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Multifunctional chitosans obtained via polymer-analogous reaction with functional five-membered cyclic carbonates
… biocides. In the preparation of these compounds carbonate couplers play an important role. Therfore different carbonate couplers were developed and evaluated by reaction with amines. Chitosan is a biocompatible natural polyamine, which is obtained from chitin - the second most abundant …
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FREE-BASE PORPHYRIN FOR CO2 ACTIVATION
… synthesis of very useful fine chemicals such as cyclic carbonates and oxazolidinones from a waste -as CO2- with a 100% of atom economy. However, carbon dioxide is a very stable molecule and an efficient catalytic species is needed to make the reaction proceeds by avoiding drastic conditions. Even …