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Showing 1 to 16 of 16 for “"Controlled-polymerization"”.
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Controlled polymerization of alkyl vinyl ethers via 'covalent' propagating species
The study of the polymerization of alkyl vinyl ethers initiated by HI/I₂ catalyst is directed into two areas: the kinetics of the polymerization and the strategy of amine functionalized prepolymer synthesis. The polymerization reactions show living behavior in nonpolar solvents at low temperatures. …
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Amino acid N-carboxyanhydrides and polypeptides: Controlled polymerization, properties and applications
The goal of my Ph.D. research is to develop controlled/living polymerization techniques of α-amino acid N-carboxyanhydrides (NCAs) and synthetic polypeptides based materials. Polypeptides are a class of emerging biomaterials receiving increasing interests for various applications including drug …
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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 …
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Preparation of Nitrile Containing Siloxane Triblock COpolymers and Their APplication As Stabilizers For Siloxane Magnetic Fluids
… were successfully prepared through kinetically controlled polymerization of hexamethylcyclotrisiloxane initiated by lithium silanolate endcapped PCPMS macroinitiators. The macroinitiators were prepared by equilibrating mixtures of 3- cyanopropylmethylcyclosiloxanes (DxCN) and dilithium …
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Multiscale simulation of heterophase polymerization : application to the synthesis of multicomponent colloidal polymer particles
Heterophase polymerization is a technique widely used for the synthesis of high performance polymeric materials with applications including paints, inks, adhesives, synthetic rubber, biomedical applications and many others. Due to the heterogeneous nature of the process, many different relevant …
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Amphiphilic BAB-triblock copolymers bearing fluorocarbon groups : synthesis and self-organization in aqueous media
… their efficiency to moderate the free radical polymerization process by polymerizing styrene (M3). Besides characterization of the homopolymers by GPC measurements, end- group analysis of the synthesized block copolymers via 1H-, 19F-NMR, and in some cases also UV-vis spectroscopy, were …
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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, …
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Investigations of sterically demanding ligands in molybdenum and tungsten monopyrrolide monoalkoxide catalysts for olefin metathesis
… 2 investigates the mechanism of the temperature-controlled polymerization of 3- methyl-3-phenylcyclopropene (MPCP) by Mo(NAr)(CHCMe 2Ph)(Pyr)(OTPP) (Ar = 2,6- diisopropylphenyl, Pyr = pyrrolide, OTPP = 2,3,5,6-tetraphenylphenoxide). Cissyndiotactic poly(MPCP) is obtained at -78 °C, while atactic …
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Effects of Functionality and Charge in the Design of Acrylic Polymers
… intiator enabled the anionic polymerization of methyl methacrylate at room temperature, resulting in narrow molecular weight distributions and syndiorich structures. Polymerizations were controlled above Al:Li = 2, and control significantly decreased at elevated temperatures …
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Investigation of nitroxide-mediated thermal and photochemical reactions of living free radical polymerization.
… thesis deals primarily with living free radical polymerization (LFRP). Two main specific areas of this process have been studied; thermal and photochemical reaction sequences. Stoichiometric unimolecular initiators were found to be ideal probes for studying the reactions involved in the LFRP …
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Macrocyclic Monomers: Synthesis, Characterization and Ring-opening Polymerization
… of high yield synthesis and facile ring-opening polymerization of cyclic polycarbonate; the need for a technique to solve the tough processibility problem of high performance polymers. This work was intended to address the following aspects in the cyclic poly(ether ketone) or sulfone system. The …
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Examining Structure-Morphology-Property Relationships of Novel Styrenic-Based Macromolecules for Emerging Applications
… styrenic macromolecules using controlled radical polymerization and conventional free radical polymerization strategies, for a variety of potential applications including electromechanical devices, ionic liquids, adhesives, and lithium-ion batteries. Block copolymers have a …
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Dual-Responsive Polymer and Hybrid Systems: Applications for Gene Delivery and Hydrogels
… of the nanoparticles, which enabled a controlled polymerization technique via the “grafting-from” approach. Gene transfection experiments with CHO-K1 cells show that the transfection efficiency is significantly higher than for poly(ethyleneimine) (PEI), which is regarded as the “gold …
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Novel Precursors for Polymer-Protein-Conjugate Synthesis via Reversible Addition-Fragmentation Chain Transfer Polymerization
The RAFT polymerization of N-isopropylacrylamide with two different chain transfer agents, namely benzyl 1-pyrrolecarbodithioate and cumyl 1-pyrrolecarbodithioate, yielded polymers with narrow molecular weight distributions as well as Mn values that were in good agreement with the calculated ones. …
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Chain-Growth Polymerization of 3-Hexylthiophene Towards Well-Defined Semiconductor Block Copolymers
… P3HT synthesis using Kumada catalyst transfer polymerization (KCTP). Kinetic studies of the active monomer formation via Grignard metathesis revealed that this reaction is rather slow, however, its completion is essential for controlled end groups. It was shown that LiCl accelerates this …
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Development of Palladium(0)-Catalyzed Suzuki Cross-Coupling Polymerizations
… developing Pd(0)-catalyzed Suzuki cross-coupling polymerization reactions including controlled ones.</p> <p>My research first studied <em>t</em>-Bu<sub>3</sub>P-coordinated 2-phenylaniline-based palladacycle complex catalyzed Suzuki cross-coupling polymerization of aryl dibromides with …