Rational design of polymeric dispersants for nanoparticles and substrates for click chemistry using atom transfer radical polymerization | Posted on:2011-05-16 | Degree:Ph.D | Type:Thesis | University:Carnegie Mellon University | Candidate:Golas, Patricia Lynn | Full Text:PDF | GTID:2441390002461445 | Subject:Chemistry | Abstract/Summary: | | This Dissertation explores the use of polymers prepared by atom transfer radical polymerization (ATRP) as substrates for the development of structure-property correlations and new functional materials. These polymeric substrates were utilized in efficient and modular "click" reactions, as described in Chapters 2--4, and as nanoparticle surface modifiers, which is detailed in Chapters 5--7. The introductory chapter provides an overview of the advantages of using controlled radical polymerization techniques for the development of polymer-based technologies Chapter 2 describes the use of polymers prepared by ATRP to probe the effects of various experimental conditions, including ligand, solvent, and reducing agent, on click reaction rate. Low-molecular weight substrates that resemble typical polymer end groups are used as model compounds in Chapter 3 to investigate the effects of the electronic and steric environment of a click chemistry reagent on its reaction rate. The combination of ATRP with click chemistry was utilized for research described in Chapter 4 for the facile synthesis of multisegmented block copolymers. Chapter 5 begins the section on designing polymers as nanoparticle surface modifiers, and is focused on the synthesis and performance assessment of well-defined polyelectrolytes prepared by ATRP as dispersants for iron oxide nanoparticles. Amphiphilic star-shaped polymers are explored as emulsifiers and adsorbents in Chapter 6, and these complex materials are also utilized as a model nanoparticle for investigating the microbial availability of particle-bound polymer. The final chapter describes the synthesis of amphiphilic gradient copolymers, which are a unique class of materials with potential as efficient particle dispersants and stabilizers for Pickering emulsions. | Keywords/Search Tags: | Substrates, Click chemistry, Dispersants, Radical, Polymers, ATRP, Nanoparticle | | Related items |
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