Download or read book RAFT Synthesis of Diblock Copolymers for Use as Aqueous Pigment Dispersants written by Shannon North and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis of Novel Block Copolymer Dispersants for Water borne Pigments written by Xavier Bories-Azeau and published by . This book was released on 2003 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis of dye labelled Thermoresponsive Block Copolymers by Raft Polymerization written by Mariana Beija and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Double hydrophilic diblock copolymers comprising a thermoresponsive block have gained increasing attention due to their capability of self-assembling in micelles by a temperature change. However, very few fluorescence studies were devoted to investigate their conformation and dynamics both at the air-water interface and in aqueous solutions. In this work, block copolymers composed of a thermoresponsive block of N,N- iethylacrylamide (DEA) and a hydrophilic block of N,N-dimethylacrylamide (DMA) or a reactive block [statistical copolymer of DMA and N-acryloxysuccinimide (NAS)] were prepared by RAFT polymerization. These block copolymers were functionalized at the hydrophilic chain-end by a Rhodamine B or Malachite Green dye using either a pre- or a post-polymerization strategy. In the first case, Rhodamine B and Malachite Green amino derivatives were synthesized for the preparation of dyelabelled chain transfer agent (CTA), which led directly the alpha-dye-labelled block copolymers. Alternatively, the block copolymers were prepared using a precursor CTA and further functionalized with the dye amino derivative. The thermoresponsive behaviour of these polymers and of amphiphilic block copolymers of DEA and N-decylacrylamide was studied at the air-water interface and in Langmuir-Blodgett films using AFM and confocal fluorescence microscopy. Fluorescence emission and anisotropy, light scattering and 1H NMR studies were performed to investigate their behaviour in aqueous solutions.

Download or read book Aqueous RAFT Synthesis of Stimuli responsive Amphiphilic Block Copolymers and Self assembly Behavior in Solution and Incorporation Into LBL Films written by Matthew Grady Kellum and published by . This book was released on 2010 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Characterisation of Stimulus responsive Diblock Copolymer Nano objects Prepared by RAFT Aqueous Dispersion Polymerisation written by Sarah Wilson and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book RAFT Polymerization 2 Volume Set written by Graeme Moad and published by John Wiley & Sons. This book was released on 2022-03-14 with total page 1283 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explore this one-stop resource for reversible addition-fragmentation chain transfer polymerization from a leading voice in chemistry RAFT Polymerization: Methods, Synthesis and Applications delivers a comprehensive and insightful analysis of reversible addition-fragmentation chain transfer polymerization (RAFT) and its applications to fields as diverse as material science, industrial chemistry, and medicine. This one-stop resource offers readers a detailed synopsis of the current state of RAFT polymerization. This text will inspire further research and continue the drive to an ever-increasing range of applications by synthesizing and explaining the more central existing literature on RAFT polymerization. It contains a beginner’s guide on how to do a RAFT polymerization before moving on to much more advanced techniques and concepts, like the kinetics and mechanisms of the RAFT process. The distinguished editors have also included resources covering the four major classes of RAFT agents and recent developments in processes for initiating RAFT polymerization. Readers will also benefit from the inclusion of: A thorough introduction to the mechanisms, theory, and mathematical modeling of RAFT Explorations of RAFT agent design and synthesis, dithioesters, dithiobenzoates, trithiocarbonates, xanthates, dithiocarbamates, macromonomer RAFT, and RAFT copolymerization Discussions of a variety of RAFT architectures, including multiblocks, combs, hyperbranched polymers, and stars Treatments of end group transformation, cationic RAFT, high-throughput RAFT, and RAFT in continuous flow An examination of sequence defined polymers by RAFT Perfect for organic chemists, polymer chemists, and materials scientists, RAFT Polymerization: Methods, Synthesis and Applications will also earn a place in the libraries of chemical engineers seeking a one-stop reference for this method of controlled radical polymerization with a wide range of applications in multiple areas.

Download or read book The Synthesis of Well Defined Functional Homo and Block Copolymers in Aqueous Media Via Reversible Addition Fragmentation Chain Transfer RAFT Polymerization written by Murat Mertoğlu and published by . This book was released on 2005 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book RAFT Synthesis of Water soluble Stimuli responsive AB Diblock Copolymers written by Ran Wang and published by . This book was released on 2008 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis of Functional Copolymers Via Aqueous RAFT Polymerization for Bioconjugation and Targeted Delivery of Small Interfering RNA written by Adam Wesley York and published by . This book was released on 2010 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Characterization of Ionically Bonded Diblock Copolymers written by Lei Feng (Chemical engineer) and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Block copolymers consist of two or more incompatible polymer chains linked by covalent bonds. These block copolymer can separate into nanometer sized domains whose morphology depends upon the size of the block and interactions between them. The properties of block copolymers can be modified and potentially improved by introducing noncovalent interactions to replace covalent linkages between blocks to form supramolecular block copolymers. These kinds of materials combine the microphase separation inherent to block copolymers with the facile synthesis of supramolecular materials thereby affording new and unique materials. This dissertation focuses on synthesis and characterization of PS-b-PMA block copolymers with ion-pair junctions.Firstly, the chain-end sulfonated polystyrene ([omega]-sulfonated PS) was synthesized by reversible addition fragmentation chain transfer (RAFT) polymerization and postpolymerization modification. In the postpolymerization modification two methods were investigated: in the first one, the polymer was converted to a thiol-terminated polymer by aminolysis. Then a sulfonic acid end-group was produced then by oxidation of the thiol end-group with m-chloroperoxybenzoicacid (m-CPBA); in the second method, the RAFT-polymerized polymer was directly sulfonated by oxidation with m-CPBA. After purification by column chromatography, [omega]-sulfonated PS was obtained by both methods with greater than 95% end-group functionality as measured by titration. The sulfonic acid end-group could be neutralized with various ammonium or imidazolium counter ions through acid-base or ionic metathesis reactions. These polymers with ionic end-group can be used as model supramolecular building blocks.Secondly, ammonium end functionalized polymethylacrylate (PMA) was synthesized directly by RAFT polymerization using functional RAFT agent. Then chain-end sulfonated polystyrene and ammonium end functionalized polymethylacrylate (PMA) were used to synthesize A-B block copolymers by two different methods: the first method was by mixing two oppositely charged end group functionalized polymers; the second method was to ionically bond a RAFT agent to the chain end of an end sulfonated polymer to generate a supramolecular macro RAFT agent then an A-B block copolymer was prepared by RAFT polymerization using supramolecular macro-RAFT agent. The polymerization kinetics were investigated and the molecular weight and the chemical structure of the block copolymers were characterized by 1H-NMR and SEC. The results show that the ion-bonded supramolecular block copolymer, PS-PMA, have been successfully prepared with controlled molecular weight and narrow distribution.Thirdly, the morphology of the ion-bonded supramolecular PS-PMA diblock copolymers were investigated by small-angle X-ray scattering (SAXS) and rheological techniques. Several covalently bonded PS-PMA block copolymers were synthesized by RAFT polymerization and their micro domain structures and rheology behaviors were also investigated. The results showed that the electrostatic interactions between the end ion groups are able to overcome the thermodynamic repulsion of two blocks result in the formation of diblock copolymers with similar behaviors and morphology of traditional covalent bonded diblock copolymers and their micro domain structures remain to high temperatures.

Download or read book Synthesis and Aqueous Solution Properties of New Hydrophilic hydrophilic Diblock Copolymers written by Lindsey Bailey and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Investigation and Analysis of RAFT mediated Block Copolymers in Aqueous Dispersed Media written by Nadine O. Pretorius and published by . This book was released on 2007 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis of Original Block Copolymers by Combination of RAFT Polymerization and Supramolecular Self assembly written by Senbin Chen and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work dealt with the preparation and the study of supramolecular block copolymers based on hydrogen-bonding between homocomplementary or heterocomplementary stickers. The synthetic strategy was based on the combination of RAFT-mediated controlled radical polymerization and supramolecular chemistry. In the Chapter 2, we developed a strategy relying on the design of RAFT agents bearing thymine/diaminopyridine (DAP) recognition pairs and capable to grow well-defined miktoarm star supramolecular copolymers. To further extend the scope of H-bonding RAFT agents, in the Chapter 3, we also investigated the preparation of RAFT agents functionalized with motifs exhibiting very high binding constants. The Hamilton/barbiturate couple (log(K)≈4-5) was selected to generate more stable supramolecular block copolymers. Aiming at elaborating original associating macromolecules and at simplifying the strategy of synthesis, we finally explored the preparation ABC triblock supramolecular copolymers based on PA11 oligomers (OPA11) in Chapter 4. Ligation of a relevant dithiobenzoate group on the oligomers afforded oligomeric RAFT agents that allow for the preparation of ABC triblock supramolecular copolymers, where A is semi-crystalline, B in rubbery state and C in glassy state. Studies on the incorporation of such copolymers in epoxy networks are under progress.

Download or read book Novel Synthesis of Block Copolymers Via the RAFT Process written by Angela Bowes and published by . This book was released on 2007 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Novel Block Copolymer Nanoparticles Via RAFT Aqueous Emulsion Polymerization written by Amy Cockram and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Characterisation of ABA Block Copolymers from Difunctional RAFT Precursors written by Thomas Martyn Legge and published by . This book was released on 2007 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design and synthesis of difunctional chain transfer agents and their subsequent use in the manufacture of ABA block copolymers was investigated. The polymerisations of methyl methacrylate, n-butyl methacrylate and n-butyl acrylate and the kinetics of their polymerizations when using a difunctional chain transfer agent were studied. Block extension experiments were performed in order to produce ABA block copolymers. Alternative strategies are explored for the synthesis of ABA block copolymers, by preparation of macro chain transfer agents through the modification of the end groups of commercially available homo- and alternating telechelic polymers bearing hydroxy end groups. The synthesis of functional chain transfer agents bearing azide groups, for potential use in block copolymer synthesis was investigated. The thermal stability of a variety of chain transfer agents was assessed for the purposed of determining their suitability for use at elevated temperatures.

Download or read book Novel Amphiphilic Diblock Copolymers by RAFT polymerization Their Self organization and Surfactant Properties written by Sébastien Garnier and published by . This book was released on 2005 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: