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.
Results
Showing 1 to 20 of 51 for “"RAFT polymerization"”.
-
Raft Polymerization Of Ph-Responsive, Diblock Copolymers For Nucleic Acid Delivery Vehicles
… With the advent of controlled radical polymerization (CRP) and more specifically reversible addition-fragmentation chain transfer (RAFT) polymerization, it is now possible to develop well-defined polymers with predicted molecular weights and architectures. The work presented here …
-
Investigation Of Parameters Enabling Admicellar Reversible Addition-Fragmentation Chain Transfer (Raft) Polymerization
To date, enormous studies on admicellar polymerization have been recorded since the initial reports in the 1980’s. This technique which offered the advantage of using inexpensive materials and facile procedures, proven to be a successful surface modification technique. Nevertheless, one has to …
-
Novel amphiphilic diblock copolymers by RAFT-polymerization, their self-organization and surfactant properties
… Addition Fragmentation Chain Transfer (RAFT) process using the new RAFT agent benzyldithiophenyl acetate is shown to be a powerful polymerization tool to synthesize novel well-defined amphiphilic diblock copolymers composed of the constant hydrophobic block poly(butyl acrylate) and of 6 …
-
The synthesis of well-defined functional homo- and block copolymers in aqueous media via Reversible Addition-Fragmentation Chain Transfer (RAFT) Polymerization
… and trithiocarbonate for free radical polymerization via Reversible Addition-Fragmentation chain Transfer (RAFT) were synthesized. The new compounds bear permanently hydrophilic sulfonate moieties which provide solubility in water independent of the pH. One of them bears a fluorophore, …
-
Adsorption behaviour of molecularly imprinted-beta-cyclodextrin polymers prepared by reversible addition-fragmentation chain transfer (RAFT) polymerization for selective recognition of benzylparaben
… addition�fragmentation chain transfer (RAFT) polymerization process were studied to generate potential MIPs. The study focuses on the characterization and adsorption behaviour of MIPs for selective recognition of benzylparaben (BzP) analyte. The potential of β-CD in MIP was investigated …
-
Overcoming Challenges in Reversible Addition–Fragmentation Chain Transfer Polymerization using Photoinduced Electron/Energy Transfer Catalysis
The development of polymerization methodologies is discussed, with an emphasis on addressing two limitations in reversible addition–fragmentation chain transfer (RAFT) polymerization. Both methods employ photoinduced electron/energy transfer (PET) catalysis to generate radicals within the …
-
Surface Modification of Nanoparticles Using Controlled Radical Polymerization For Designed Interfaces
<p> This research focuses on using controlled polymerization techniques such as Radical Addition Fragmentation Chain Transfer Polymerization (RAFT) to graft polymers from the surface of colloidal silica nanoparticles for incorporation in polymers to make composites. </p> <p>In the first part of …
-
Synthesis and Characterization of Graphene-Polymer Nanocomposites via Reversible Addition-Fragmentation Chain-Transfer Polymerization
… addition-fragmentation chain-transfer (RAFT) polymerization. Graphene oxide was synthesized by reacting graphite with potassium permanganate and concentrated sulfuric acid. The oxidation and exfoliation of graphite was investigated using FTIR, TEM, and AFM studies. For the methodology of …
-
Bridging Mesoscale Phenomena and Macroscopic Properties in Block Copolymers Containing Ionic Interactions and Hydrogen Bonding
Anionic polymerization and controlled radical polymerization enabled the synthesis of novel block copolymers with non-covalent interactions (electrostatic interaction and/or hydrogen bonding) to examine the relationships between mesoscale phenomenon and macroscopic physical properties. Non-covalent …
-
Developing green processes for the conversion of biobased materials into pyrones
… <p>In the fourth chapter, we combined anionic polymerization with reversible addition fragmentation chain transfer RAFT polymerization by the development of macro-chain transfer agent. The conversion of anionic polystyrene to block acrylic copolymers had an efficiency as high as 97%. This was …
-
Synthesis and controlled radical polymerization of multifunctional monomers
… and different protective groups were used. After polymerization the protective groups were removed by different methods. Various initiators for the NMP of the monomers were synthesized and the reaction conditions were optimized. The results showed that NMP was not a suitable method for …
-
Controlling the Properties of Polymer Metal-Organic Frameworks and Cages Through Polymer Ligand Design
… linkers on their sidechains using common radical polymerization techniques: reversible addition fragmentation chain transfer (RAFT) polymerization and free radical polymerization (FRP). High-dispersity ligands prepared through FRP formed crystalline polyMOFs while low-dispersity RAFT ligands …
-
Design, Synthesis and Application of Cylindrical Polymer Brushes: From Nanostructures to Advanced Materials
… addition-fragmentation chain transfer (RAFT) polymerization, designed and prepared complex functional CPBs for light-harvesting and energy transfer, and utilized CPBs as templates for the synthesis of novel one-dimensional (1D) organic/inorganic hybrid nanostructures. The ‘grafting-from’ …
-
Development of Sustainable Thermoplastic Elastomers
… addition fragmentation chain transfer (RAFT) polymerization. SAS exhibited elastomeric behavior at room temperature and were processable above the order-disorder transition (ODT) temperature. The alkyl side-chain length of the polyacrylates (as well as the related midblock composition of …
-
The synthesis of amphiphilic diblock copolymers: An investigation into the formation of micelles as a function of hydrophobic block length
… into protective core-shell micelles. Using RAFT polymerization, copolymers containing poly(acrylic acid) and poly(methyl acrylate) blocks were made with high monomer conversion and narrow distributions of molecular weight for eventual use in medicinal applications. Based on previous findings …
-
Multiblock Copolymer Synthesis in Aqueous Heterogeneous Systems
… development of Reversible Deactivation Radical Polymerization (RDRP) techniques have revolutionized the field of polymer chemistry. These techniques provide the ease and flexibility of conventional radical polymerization, yet hold much of the control and livingness of anionic polymerization. …
-
Synthesis of DMAP tethered polymer chains for reversible micelle formation
… reactor. Thus, the goal of my research is to use RAFT polymerization methods to synthesize a hydrophobic polymer chain bearing 4-methylaminopyridine units and to attach it to a hydrophilic polymer chain to create a polymer system capable of micelle formation in solution. These functionalized …
-
Twofold switchable block copolymers based on new polyzwitterions
… addition-fragmentation chain transfer (RAFT) polymerization, using a fluorophore labeled RAFT agent. The polyzwitterions of systematically varied molar mass were characterized with respect to their solubility in water, deuterated water, and aqueous salt solutions. These …
-
Polymerní terapeutika pro imunoonkoterapii
… precursors were synthesized by controlled RAFT polymerization in order to prepare highly defined carrier systems. In the framework of this master thesis, two derivatives of the selected drug were prepared, differing in the carboxylic acid used and the mode of their binding to the polymeric …
Page 1 of 3