Polymeric Amphiphilic Nanoparticles Via Intramolecular Chain Collapse Using 1 Functionalized Vinylbenzocyclobutenes PDF Download
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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.
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 | : José A. Pomposo |
Publisher | : John Wiley & Sons |
Total Pages | : 504 |
Release | : 2017-08-18 |
Genre | : Technology & Engineering |
ISBN | : 3527806393 |
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 | : Paolo Bettotti |
Publisher | : Springer |
Total Pages | : 351 |
Release | : 2017-02-21 |
Genre | : Technology & Engineering |
ISBN | : 3319530356 |
Download Submicron Porous Materials Book in PDF, ePub and Kindle
This book covers the latest research on porous materials at the submicron scale and inspires readers to better understand the porosity of materials, as well as to develop innovative new materials. A comprehensive range of materials are covered, including carbon-based and organic-based porous materials, porous anodic alumina, silica, and titania-based sol-gel materials. The fabrication, characterization, and applications of these materials are all explored, with applications ranging from sensors, thermoelectrics, catalysis, energy storage, to photovoltaics. Also of practical use for readers are chapters that describe the basics of porous silicon fabrication and its use in optical sensing and drug delivery applications; how thermal transport is affected in porous materials; how to model diffusion in porous materials; and a unique chapter on an innovative spectroscopic technique used to characterize materials' porosity. This is an ideal book for graduate students, researchers, and professionals who work with porous materials.
Author | : Valentina Grumezescu |
Publisher | : Elsevier |
Total Pages | : 596 |
Release | : 2019-03-21 |
Genre | : Medical |
ISBN | : 0128168757 |
Download Materials for Biomedical Engineering: Thermoset and Thermoplastic Polymers Book in PDF, ePub and Kindle
Materials for Biomedical Engineering: Thermoset and Thermoplastic Polymers presents the newest and most interesting approaches to intelligent polymer engineering in both current and future progress in biomedical sciences. Particular emphasis is placed on the properties needed for each selected polymer and how to increase their biomedical potential in varying applications, such as drug delivery and tissue engineering. These materials are intended for use in diagnoses, therapy and prophylaxis, but are also relatable to other biomedical related applications, such as sensors. Recent developments and future perspectives regarding their use in biomedicine are discussed in detail, making this book an ideal source on the topic. Highlights the most well-known applications of thermoset and thermoplastic polymers in biological and biomedical engineering Presents novel opportunities and ideas for developing or improving technologies in materials for companies, those in biomedical industries, and others Features at least 50% of references from the last 2-3 years
Author | : John Delmonte |
Publisher | : Springer |
Total Pages | : 261 |
Release | : 2013-12-21 |
Genre | : Technology & Engineering |
ISBN | : 1468414461 |
Download Metal/Polymer Composites Book in PDF, ePub and Kindle
Author | : Anna J. Furth |
Publisher | : |
Total Pages | : 136 |
Release | : 1986 |
Genre | : Macromolecules |
ISBN | : 9780335162215 |
Download Self-assembly of Macromolecules Book in PDF, ePub and Kindle
Author | : American Chemical Society. Meeting |
Publisher | : |
Total Pages | : 488 |
Release | : 2005 |
Genre | : Language Arts & Disciplines |
ISBN | : |
Download Polymer Biocatalysis and Biomaterials Book in PDF, ePub and Kindle
Likewise, biomaterials comprise an equally exciting field of research that finds many applications in dental, surgical, and medical areas. Both fields are highly interdisciplinary, requiring (at various times) knowledge and expertise in organic and polymer chemistry, material science, biochemistry, molecular biology, and chemical engineering.
Author | : Valentina Grumezescu |
Publisher | : Elsevier |
Total Pages | : 512 |
Release | : 2019-03-25 |
Genre | : Medical |
ISBN | : 0081028156 |
Download Materials for Biomedical Engineering Book in PDF, ePub and Kindle
Materials for Biomedical Engineering: Inorganic Micro- and Nanostructures presents recent, specific insights in new progress, along with new perspectives for inorganic micro- and nano-particles. The main focus of this book is on biomedical applications of these materials and how their biological properties are linked to various synthesis methods and their source of raw materials. Recent information regarding optimized synthesis methods to obtain improved nano- and microparticles for biomedical use, as well as the most important biomedical applications of these materials, such as the diagnosis and therapy of cancer, are highlighted in detail. Provides a valuable resource of recent scientific progress, highlighting the most well-known applications of inorganic micro- and nanostructures in bioengineering Presents novel opportunities and ideas for developing or improving technologies in composites by companies, biomedical industries, and others Features at least 50% of its references from the last 2-3 years
Author | : Rumiana Kotsilkova |
Publisher | : iSmithers Rapra Publishing |
Total Pages | : 352 |
Release | : 2007 |
Genre | : Science |
ISBN | : 9781847350633 |
Download Thermoset Nanocomposites for Engineering Applications Book in PDF, ePub and Kindle
Thermoset nanocomposites represent a new technology solution. These new formulations benefit from improved dimensional/thermal stability, flame retardancy and chemical resistance; and have potential applications in marine, industrial and construction markets.This book helps to answer questions related to the design of nanocomposites by controlling the processing technology and structure. The book is addressed not only to researchers and engineers who actively work in the broad field of nanocomposite technology, but also to newcomers and students who have just started investigations in this mul.