Synthesis And Characterization Of Novel Functional Electrosterically Stabilized Colloidal Particles Prepared By Emulsion Polymerization Using A Strongly Ionized Amphiphilic Diblock Copolymer
DOWNLOAD
Download Synthesis And Characterization Of Novel Functional Electrosterically Stabilized Colloidal Particles Prepared By Emulsion Polymerization Using A Strongly Ionized Amphiphilic Diblock Copolymer PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Synthesis And Characterization Of Novel Functional Electrosterically Stabilized Colloidal Particles Prepared By Emulsion Polymerization Using A Strongly Ionized Amphiphilic Diblock Copolymer book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Synthesis And Characterization Of Novel Functional Electrosterically Stabilized Colloidal Particles Prepared By Emulsion Polymerization Using A Strongly Ionized Amphiphilic Diblock Copolymer
DOWNLOAD
Author :
language : en
Publisher:
Release Date :
Synthesis And Characterization Of Novel Functional Electrosterically Stabilized Colloidal Particles Prepared By Emulsion Polymerization Using A Strongly Ionized Amphiphilic Diblock Copolymer written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
Fabrication Of Anisotropic Polymer Colloid Particles
DOWNLOAD
Author : Attyah Alzhrani
language : en
Publisher:
Release Date : 2011
Fabrication Of Anisotropic Polymer Colloid Particles written by Attyah Alzhrani and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
The fabrication of complex colloidal particles with anisotropic "patchy" e.g. Januslike, morphology will be studied. Known approaches towards "Janus particles" focus mostly on the micron-sized domain, with common fabrication routes based on monolayer modification or microfluidic production (restricts scale-up). We operate in the submicron regime (typically 100-500 nm) and use scalable emulsion polymerization strategies, in combination with entropic phase separation of swollen cross-linked latex particles and living radical polymerization, i.e. SET-LRP, to prepare our "patchy" amphiphilic particles. In this research, various Cross-linked densities (typically from 1 - 8wt%) poly(styrene) latexes (typically 100-500 nm) functionalized with tert-bromine functional groups, by batch or shot addition of (2-methacryloxyethyl -2- bromoisobutyrate) made via soap-free emulsion polymerization used as the precursor particles. Two synthetic pathways were investigated to make the targeted hairy Janus Particles. Approach one: in which we carried out the domain formation step prior to the fabrication of the polymer brushes, We found out that the effective synthetic way to make Janus hairy dumbbell particles in a reproducible manner is to start the synthesis with light cross-linked density of (1.9 to 3.0 wt% DVB) precursor poly(styrene) latex particles (150-250 nm diameter) made by shot addition method. The direct entropic phase separation from these latex particles leads to the formation of only one new domain with dumbbell shape morphology, when the swelling ratio used between monomer and latex is between 2.0 and 4.0, and with low DVB concentration in the swelling monomer (between 0.15-1.0wt%) using AIBN as initiator. Formation of hydrophilic polymer brushes by SET-LRP resulted in targeted hairy Janus particles with sub-micrometer diameter, in a reproducible manner. The length of the polymer brushes can be controlled by addition of water soluble ATRP initiator to produce shorter polymer brushes. The rate of SET-LRP was ultrafast and the rate can be reduced by addition of deactivator CuBr2. The second approach: water-soluble polymer brushes were grafted onto the surface of latex particles by SET-LRP. These "hairy" cross-linked colloids were swollen with additional monomers and initiator. Elevation of temperature causes entropic phase separation inducing new domains, which were polymerized. This approach leads to mainly popcorn and raspberry particles with some limited cases that are able to make hairy Janus Particles with non reproducible manner. The obtained complex particles show some interesting application such as a stabilization agent for Carbon Nanotubes (CNTs) in aqueous medium, Pickering emulsion stabilizer, and they self assembled upon addition of dilute electrolyte solution.
Synthesis And Characterization Of Anisotropic Colloidal Particles
DOWNLOAD
Author : Martin Hoffmann
language : en
Publisher: Logos Verlag Berlin
Release Date : 2010
Synthesis And Characterization Of Anisotropic Colloidal Particles written by Martin Hoffmann and has been published by Logos Verlag Berlin this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Anisotropic colloids differ from isotropic particles as they may combine a non-spherical shape with a heterogeneous composition or surface chemistry. These versatile colloids have moved into the focus of various research groups in the fields of chemistry and physics. Hence, preparation pathways for novel model systems and their characterization are challenging aspects in fundamental research and material science. In the first part of this work, the author describes the synthesis and characterization of two colloidal systems with dumbbell-shaped core-shell morphology. The core consists of poly(methyl methacrylate) and poly(styrene). As a special feature, the attached shell layer promotes the change of the particle size and the aspect ratio by simply changing the ionic strength or temperature. Depolarized dynamic light scattering (DDLS) was used to investigate how these stimuli affect the translational and the rotational diffusion in the highly diluted state. The hydrodynamics of the particles could be well described with stick-boundary conditions by using analytical expressions for a double sphere, prolate ellipsoid and cylinder or the shell model, respectively. Electron and scanning force microscopy were applied to image the particle morphology in real space. The second part is devoted to the hydrodynamics of monodisperse, submicron-sized colloidal clusters, which consist of one to four spherical building blocks. The author demonstrates that the shell model is an excellent tool to identify the rotational relaxations which are accessible by DDLS.
Emulsion Polymerization
DOWNLOAD
Author : Irja Piirma
language : en
Publisher:
Release Date : 1982
Emulsion Polymerization written by Irja Piirma and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Science categories.
Synthesis Of Silica Polymer Hybrid Particles Via Controlled Radical Polymerization In Aqueous Dispersed Media
DOWNLOAD
Author : Xiaoguang Qiao
language : en
Publisher:
Release Date : 2013
Synthesis Of Silica Polymer Hybrid Particles Via Controlled Radical Polymerization In Aqueous Dispersed Media written by Xiaoguang Qiao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Water-soluble brush-type polymers composed of poly(ethylene)oxide methacrylate (PEOMA) units with PEO side groups of various chain lengths (Mn = 300 and 950 g mol-1) or of PEOMA300 with methacrylic acid (MAA) were synthesized by nitroxide-mediated polymerization using an alkoxyamine initiator (BlocBuilder®) and SG1 nitroxide in the presence of a low amount of styrene. The PEOMA300-MAA based copolymers showed a dual temperature/pH response. The two series of macroalkoxyamines were used in aqueous emulsion copolymerization of nbutyl methacrylate and styrene leading to the formation of particles composed of amphiphilic block copolymers through polymerization-induced self-assembly, in both the absence and presence of silica. The experiments performed in the absence of silica particles resulted in the formation of sterically or electrosterically stabilized latexes. The polymerization exhibited all the features of a controlled system with however the presence of a small proportion of dead chains. The effect of pH value, ionic strength and type and concentration of the macroalkoxyamine initiator on polymerization kinetics and latex morphologies was investigated. Depending on the reaction conditions, spherical particles, vesicles or nanofibers were successfully prepared. The PEO-based macroalkoxyamines were shown to adsorb on the silica surface via hydrogen bond interaction between PEO and the silanol groups. This enabled block copolymers to be generated in situ on the silica surface leading to hybrid particles with snowman, raspberry, daisy, core-shell, “tadpole-” and “centipede-” like morphologies depending on the silica particle size, pH value and type of macroinitiator.
The Kinetics Of Electrosterically Stabilized Emulsion Polymerization Systems
DOWNLOAD
Author : Stuart Craig Vincent Thickett
language : en
Publisher:
Release Date : 2008
The Kinetics Of Electrosterically Stabilized Emulsion Polymerization Systems written by Stuart Craig Vincent Thickett and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Emulsion polymerization categories.
Polymeric Dispersions Principles And Applications
DOWNLOAD
Author : J.M. Asua
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Polymeric Dispersions Principles And Applications written by J.M. Asua and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Technology & Engineering categories.
A comprehensive and up to date survey of the science and technology of polymeric dispersions. The book discusses the kinetics and mechanisms of polymerization in dispersed media, examines the processes controlling particle morphology, presents both off-line and on-line methods for the characterization of polymer colloids, considers reactor engineering and control, and covers a wide variety of applications, such as latex paint formulations, encapsulation of inorganic particles, reactive latexes, adhesives, paper coating, and biomedical and pharmaceutical applications. Audience: A valuable resource for scientists and engineers, academic and industrial, who are involved in the manufacture or application of polymeric dispersions.
Emulsion Polymerization
DOWNLOAD
Author : Robert G. Gilbert
language : en
Publisher:
Release Date : 1995
Emulsion Polymerization written by Robert G. Gilbert and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Science categories.
This book provides a modern overview of the principles governing emulsion polymerization, a topic of both academic and industrial importance. The reader is provided with the mathematical, physical and technical tools to understand the mechanisms and physical chemistry of these systems, particularly the major advances of the last 15 years. The book describes the mechanisms that govern the various aspects of an emulsion polymerization, and how from appropriate experimental studies, the dominant mechanisms in a particular system may be deduced. From such deductions, the means are developed whereby the properties of the result of the emulsion polymerization can be quantitatively modelled and trends can be qualitatively understood and predicted. This book opens the way to the intelligent, knowledge-based design that is the future for improvements and innovations in products and processes from this important technology. Provides a thoroughly up-to-date overview of the principles and practices of emulsion polymerization Contains mathematical, physical, and technical tools which enable the reader to understand the mechanisms and physical chemistry used in the field Includes extensive exercises with model answers
Synthesis Of Novel Zwitterionic Polymers
DOWNLOAD
Author : Matthew Skinner
language : en
Publisher:
Release Date : 2018
Synthesis Of Novel Zwitterionic Polymers written by Matthew Skinner and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
This dissertation describes the synthesis, characterization, and investigation of novel zwitterionic polymers containing phosphorylcholine (PC), sulfobetaine (SB), and functional choline phosphate (CP) zwitterions for use as surfactants, self-assembled nanomaterials, and therapeutics. Facile, reproducible, and modular chemistries were utilized for incorporating zwitterions into a range of polymer backbones, and strategies were developed for overcoming difficult challenges encountered in zwitterionic polymer synthesis, especially related to the varying solubility of zwitterions, hydrophobic polymers, and functional comonomers. Synthetic strategies utilized in this work give access to well-defined materials with narrow molecular weight distributions, tunable compositions and architectures, and versatile chemical functionality. Chapter 2 describes the synthesis of water-soluble PC- and SB-functionalized siloxane polymers. PC- and SB-siloxane homopolymers and block copolymers were synthesized using thiol-ene 'click' chemistry, and their assembly in water and at oil-water interfaces was investigated. Chapter 3 describes the preparation of zwitterionic block copolymer analogues of commercial Pluronic® surfactants. PC-containing triblock copolymers were prepared with tunable zwitterion content (5-47 mole percent) and relatively narrow molecular weight distributions. These block copolymer amphiphiles readily formed nanoparticles in water and served as novel surfactants. Through the copolymerization of PC- and CP-methacrylate monomers, functional mimics of conventional Pluronic structures became amenable to crosslinking and the successful synthesis of nanomaterials and robust gels. Chapter 4 presents the in vivo evaluation of poly(2-methacryloyloxyethyl phosphorylcholine)-doxorubicin (polyMPC-Dox) prodrugs for treating human ovarian tumors (SKOV-3). In human ovarian tumor-bearing mice, polyMPC-Dox prodrugs with an approximate Dox loading of 19 weight percent accumulated in tumor tissue at twice the level of free Dox, and animals treated with polyMPC-Dox exhibited enhanced survival and retarded tumor growth compared to conventional Dox treatment. Finally, Chapter 5 augments the polyMPC prodrug concept with the development of polymer-temozolomide (TMZ) conjugates intended for glioblastoma treatment. PolyMPC-TMZ prodrugs were prepared by the controlled free radical copolymerization of MPC and novel TMZ-methacrylate monomers, affording copolymers with random and block architectures. Polymer conjugation significantly improved the solution stability of TMZ, and the antitumor activity of polyMPC-TMZ prodrugs was demonstrated in TMZ-sensitive (U87MG) and TMZ-resistant (T98G) glioblastoma cell lines. The impact of drug loading, polymer architecture, and adjuvant co-delivery on the cytotoxicity of polyMPC-TMZ conjugates was investigated.
Preparation And Characterisation Of Colloidal Particles With A Thick Stabilising Polymer Layer
DOWNLOAD
Author : Paul Jonathan Seymour
language : en
Publisher:
Release Date : 2003
Preparation And Characterisation Of Colloidal Particles With A Thick Stabilising Polymer Layer written by Paul Jonathan Seymour and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.