Synthesis Of Nanoparticles By Single Chain Collapse Of Hyperbranched Polymers Using Sol Gel Chemistry PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Synthesis Of Nanoparticles By Single Chain Collapse Of Hyperbranched Polymers Using Sol Gel Chemistry PDF full book. Access full book title Synthesis Of Nanoparticles By Single Chain Collapse Of Hyperbranched Polymers Using Sol Gel Chemistry.
Author | : Yiwen Wang |
Publisher | : |
Total Pages | : 47 |
Release | : 2015 |
Genre | : Branched polymers |
ISBN | : |
Download Synthesis of Nanoparticles by Single-chain Collapse of Hyperbranched Polymers Using Sol-gel Chemistry Book in PDF, ePub and Kindle
Recently nanoparticles made from linear polymers has achieved great success because of its significant potential in science, pharmaceutical and drug delivery fields, but seldom are nanoparticles made by hyperbranched polymers reported. In our project, we aimed to synthesize nanoparticles from hyperbranched polymers. In the synthesis of nanoparticles, there is a limitation in getting well-defined particles; that is, the particle structure is often uncontrollable. To solve this problem, single-chain collapse is applied here to provide an easy path to obtain particles with small diameters.In this project, we synthesized nanoparticles based on a hyperbranched copolymer poly[(methyl acrylate)-co-(3-(triethoxysilyl)propyl methacrylate)], which was prepared by the copolymerization of (2-bromo-2-methoxycarbonyl)ethyl acrylate, with 3-(triethoxysilyl)propyl methacrylate (TESPMA). With (2-bromo-2-methoxycarbonyl)ethyl acrylate, as an inimer, and 3-(trimethoxysilyl)propyl methacrylate (TMSPMA) as a silicon-containing monomer, the trialkoxysilyl groups provide crosslink sites for intarmolecular single-chain collapse by gelation. These highly branched polymers were snythesized by atom transfer radical polymerization (ATRP). The nanoparticles were produced later by gelation of the triethoxysilyl groups in dilute solution to guarantee intramolecular crosslink.
Author | : Ramadan Abouomar |
Publisher | : |
Total Pages | : 220 |
Release | : 2019 |
Genre | : Branched polymers |
ISBN | : |
Download Synthesis and Thermodynamics of Nanoparticles Prepared by Single-chain Collapse of Siloxane-containing Linear and Hyperbranched Polymers Book in PDF, ePub and Kindle
Single chain nanoparticles (SCNPs) have recently achieved great success because of their significant potential in applications such as separation science and drug delivery. A major aim of these studies was to establish the factors that control their size. However, the effect of the spacer length between the polymer backbone and the cross-linkable site is not well established. This study presents the preparation of two series of linear polymers and their SCNPs with two different spacer lengths (3- and 11-carbons) in order to investigate the effect of the spacer on various properties of the nanoparticles. Sol-gel chemistry was used to crosslink single chains under conditions that prefer intramolecular cross-linking. The first series was poly[methyl methacrylate-co-3-(triisopropoxysilyl)propyl methacrylate]. Nanoparticles were prepared from copolymers containing 9 mol% silane monomer and with different molecular weights. Nanoparticles were also prepared from copolymers containing 22 and 31 mol% silane monomer. The second copolymer series was poly[methyl methacrylate-co-11-(triisopropoxysilyl)undecyl methacrylate]. The corresponding hyperbranched polymers were being prepared to determine the effect of polymer architecture on the preparation and properties of SCNPs. For this comparison. The silane-containing inimer, [2-bromo-2-(3'-triisopropoxysilyl)propan-1-oxycarbonyl]ethyl methacrylate was synthesized by hydrosilation of the allyl inimer, [2-bromo-2-(allyl-1-oxycarbonyl]ethyl methacrylate. The hyperbranched precursor polymers were prepared via atom transfer radical polymerization of the silyl inimer. Nanoparticles were produced by hydrolysis and condensation of the triisopropoxysilyl groups under pseudo-high dilution conditions to guarantee intramolecular crosslinking. To investigate the nanoparticle applicability as a stationary phase in chromatography, inverse gas chromatography (IGC) was used to thermodynamically characterize the prepared polymers and nanoparticles.
Author | : José A. Pomposo |
Publisher | : John Wiley & Sons |
Total Pages | : 420 |
Release | : 2017-08-29 |
Genre | : Technology & Engineering |
ISBN | : 3527806415 |
Download Single-Chain Polymer Nanoparticles Book in PDF, ePub and Kindle
This first book on this important and emerging topic presents an overview of the very latest results obtained in single-chain polymer nanoparticles obtained by folding synthetic single polymer chains, painting a complete picture from synthesis via characterization to everyday applications. The initial chapters describe the synthetics methods as well as the molecular simulation of these nanoparticles, while subsequent chapters discuss the analytical techniques that are applied to characterize them, including size and structural characterization as well as scattering techniques. The final chapters are then devoted to the practical applications in nanomedicine, sensing, catalysis and several other uses, concluding with a look at the future for such nanoparticles. Essential reading for polymer and materials scientists, materials engineers, biochemists as well as environmental chemists.
Author | : Ajay Ramesh Amrutkar |
Publisher | : |
Total Pages | : 0 |
Release | : 2016 |
Genre | : Crosslinked polymers |
ISBN | : |
Download Synthesis of Polymer Nanoparticles Using Intramolecular Chain Collapse and Benzocyclobutene Chemistry Book in PDF, ePub and Kindle
Single chain polymer nanoparticle (SCPN) synthesis from different polymer precursors using benzocyclobutene (BCB) chemistry and intramolecular crosslinking was investigated in this study. Synthesis of highly fluorinated SCPNs from highly fluorinated uni-block copolymer precursor utilizing `pseudo-high dilution continuous addition technique' was investigated. GPC confirmed selective intramolecular crosslinking and TEM images supported formation of sub-20 nm spherical polymer nanoparticles. Amphiphilic SCPNs prepared via step-wise crosslinking of an amphiphilic di-block copolymer chain were investigated for their morphology using 4 different characterization techniques: TEM, AFM, DLS and DOSY-NMR. TEM and AFM images showed presence of discreet SCPNs as loosely crosslinked coils that flatten out when deposited on the surface forming pancake like morphology with ̃ 20 nm sizes. All the techniques showed presence of bimodal size distribution of these nanoparticles in solution. A smaller sized distribution represented discreet SCPNs whereas larger sized (>40 nm) distribution represented physical aggregates of SCPNs. These aggregates were broken down upon significantly diluting the solution of nanoparticles (=50 ng/mL). AFM analysis and water contact angle studies on thin films of amphiphilic SCPNs and polystyrene homopolymer blends proved that nanoparticles possess Janus-type morphology. In order to aid synthesis of SCPNs from block copolymer precursors, a new 2-component room temperature polymer crosslinking based on 1-acetoxyBCB containing polymers and a nucleophile was developed. Development of this system involved developing synthesis of new monomer (1-acetoxy-4 and 5-vinylBCB), synthesis of polymers containing this new monomer followed by optimization of their crosslinking reaction. Mechanism of crosslinking and structure of crosslinking unit formed for this crosslinking system was also identified. SCPNs were synthesized at room temperature from uni-block copolymer precursors using this new crosslinking system. Crosslinking reaction was characterized using 1H NMR, GPC and LS-GPC. Symmetric ABA tri-block copolymer precursors are proposed as precursors for synthesis of SCPNs of different morphologies employing intramolecular crosslinking. Initial results on synthesis of ABA tri-block copolymer containing highly immiscible blocks using chain extension approach is also reported.
Author | : Vikas Mittal |
Publisher | : CRC Press |
Total Pages | : 384 |
Release | : 2010-07-13 |
Genre | : Technology & Engineering |
ISBN | : 1439814449 |
Download Advanced Polymer Nanoparticles Book in PDF, ePub and Kindle
Polymer latex particles continue to become increasingly important in numerous commercial applications. Advanced synthesis techniques are the key to developing new functionality for nanoparticles. These methods make it possible to tailor the size, chemical composition, or properties of these particles, as well as the molecular weight of the polymer
Author | : Guadalupe Valverde Aguilar |
Publisher | : BoD – Books on Demand |
Total Pages | : 108 |
Release | : 2019-02-13 |
Genre | : Technology & Engineering |
ISBN | : 1789853338 |
Download Sol-Gel Method Book in PDF, ePub and Kindle
The sol-gel method is a powerful route of synthesis used worldwide. It produces bulk, nano- and mesostructured sol-gel materials, which can encapsulate metallic and magnetic nanoparticles, non-linear azochromophores, perovskites, organic dyes, biological molecules, etc.. This can have interesting applications for catalysis, photocatalysis; drug delivery for treatment of neurodegenerative diseases such as cancer, Parkinson's and Azheimer's. In this book, valuable contributions related to novel materials synthesized by the sol-gel route are provided. The effect of the sol-gel method to synthesize these materials with potential properties is described, and how the variation of the parameters during the synthesis influences their design and allows to adjust their properties according to the desired application is discussed.
Author | : |
Publisher | : |
Total Pages | : 72 |
Release | : 2013 |
Genre | : |
ISBN | : |
Download Synthesis of Single Chain Polymer Nanoparticles by the Palladium-catalyzed Sonogashira Coupling Book in PDF, ePub and Kindle
Author | : Stanislav Rangelov |
Publisher | : CRC Press |
Total Pages | : 484 |
Release | : 2013-08-28 |
Genre | : Science |
ISBN | : 143986909X |
Download Polymer and Polymer-Hybrid Nanoparticles Book in PDF, ePub and Kindle
Polymeric and hybrid nanoparticles have received increased scientific interest in terms of basic research as well as commercial applications, promising a variety of uses for nanostructures in fields including bionanotechnology and medicine. Condensing the relevant research into a comprehensive reference, Polymer and Polymer-Hybrid Nanoparticles: Fr
Author | : Nikos Hadjichristidis |
Publisher | : Springer |
Total Pages | : 1075 |
Release | : 2015-09-01 |
Genre | : Technology & Engineering |
ISBN | : 4431541861 |
Download Anionic Polymerization Book in PDF, ePub and Kindle
This book presents these important facts: a) The mechanism of anionic polymerization, a more than 50-year challenge in polymer chemistry, has now become better understood; b) Precise synthesis of many polymers with novel architectures (triblock, multi-block, graft, exact graft, comb, cyclic, many armed stars with multi-components, dendrimer-like hyper-branched, and their structural mixed (co)polymers, etc.) have been advanced significantly; c) Based on such polymers, new morphological and self-organizing nano-objects and supra molecular assemblies have been created and widely studied and are considered nanodevices in the fields of nano science and technology; d) New high-tech and industrial applications for polymeric materials synthesized by anionic polymerization have been proposed. These remarkable developments have taken place in the last 15 years. Anionic polymerization continues to be the only truly living polymerization system (100 % termination free under appropriate conditions) and consequently the only one with unique capabilities in the synthesis of well-defined (i.e., precisely controlled molecular weight, nearly mono-disperse molecular weight distribution, structural and compositional homogeneity) complex macromolecular architectures. This book, with contributions from the world’s leading specialists, will be useful for all researchers, including students, working in universities, in research organizations, and in industry.
Author | : William Kenneth Storms |
Publisher | : |
Total Pages | : 207 |
Release | : 2015 |
Genre | : Diblock copolymers |
ISBN | : |
Download Polymeric Amphiphilic Nanoparticles Via Intramolecular Chain Collapse Using 1-functionalized Vinylbenzocyclobutenes Book in PDF, ePub and Kindle
Synthetic routes to 1-functionalized 4-vinylbenzocyclobutenes were developed with cyano, ester, amide and acetoxy 1-functional groups. The synthesis of a high molecular weight diblock quaterpolymer (i.e. two block, with two monomers in each block), where the blocks were highly immiscible (hydrocarbon/aliphatic fluorocarbon) and each contained a thermal crosslinker with a distinct curing temperature range, i.e. a "low" temperature crosslinker and a "high" temperature crosslinker by sequential polymerization using controlled radical polymerization was investigated. The synthesis of the desired diblock quaterpolymer was difficult or impossible due to radical chain transfer to 1-ethoxybenzocylcobutene. Fast chain-transfer to 1-ethoxybenzocyclobutene caused the polymerization to be inefficient and poorly controlled. Using a combination of ATRP and post-polymerization functionalization via the nucleophilic aromatic substitution of poly(pentafluorostyrene), a modular route to a strongly phase segregating benzocyclobutene functional diblock quaterpolymer was established. A linear diblock quaterpolymer was collapsed in two steps under pseudo-high dilution conditions into an amphiphilic single chain nanoparticle. Characterization of the soft organic particles by GPC, 1H- and 19F-NMR spectroscopy, atomic force microscopy, and transmission electron microscopy confirmed that they were single-chain particles. As part of a plan to possibly prepare the desired strongly phase segregating diblock copolymers by polymer-polymer conjugation using copper catalyzed azide-alkyne cycloaddition, the ATRP of styrene initiated from the popular alkyne functional initiator, prop-2-yn-1-yl 2-brom-2-methylpropanoate (PBiB), was systematically investigated. Using polymerization studies of PBiB a non-degenerative chain coupling side reaction was shown to be occurring. By repeating this study with similar protected alkyne functional ATRP initiators the side reaction was shown to be occurring due to the presence of a terminal alkyne. 1H-NMR studies supported these findings, specifically showing that unprotected terminal alkynes can undergo oxidative alkyne-alkyne coupling under ATRP conditions.