Download or read book Synthesis and Characterization of Styrene and Acrylate based Polymer supported Reagents written by Jozsef Devenyi and published by . This book was released on 1994 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Characterization of Polymer supported Bifunctional Reagents with Enhanced Ionic Recognition written by Donna Rice Quillen and published by . This book was released on 1989 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Characterization of Novel Polymer supported Ion complexing Reagents written by Kelly P. Ripperger and published by . This book was released on 1997 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymer Synthesis and Characterization written by Stanley R. Sandler and published by Elsevier. This book was released on 1998-05-21 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: This laboratory manual covers important techniques for polymer synthesis and characterization, and provides newcomers with a comprehensive introduction to the basic principles of highlighted techniques. The reader will benefit from the clear writing style and straightforward approach to fairly complex ideas. The book also provides references that the more advanced reader can use to obtain in-depth explanations of techniques. Polymer Synthesis and Characterization will serve as a useful resource for industrial technicians and researchers in polymer chemistry and physics, material science, and analytical chemistry. - Combines the extensive industrial and teaching experience of the authors - Introduces the user to the concept of "Good Manufacturing Practice" - Presents experiments that are representative of a wide variety of polymerization and characterization methods - Includes numerous references for more advanced students, technicians, and researcher
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Phosphorus Based Polymers written by Sophie Monge and published by Royal Society of Chemistry. This book was released on 2014-05-30 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive overview of the synthesis of different phosphorus-containing polymers and their uses in biomedical, environmental and energy applications.
Download or read book American Doctoral Dissertations written by and published by . This book was released on 2000 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Characterization of Polymers Incorporating N alkyl Urea peptoid Sequences written by Xiaoping Chen and published by . This book was released on 2013 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation is mainly based on the works of synthesis and characterization of polymer/N-alkyl urea peptoid hybrid materials. Polymers were synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization using thrithiocarbonate and dithiocarbonate chain transfer agents in controlled manner. Poly(N-alkyl urea peptoid) was synthesized via step growth polymerization using symmetric diamine and diisocyanate. N-Alkyl urea peptoid sequences up to sixmer were synthesized through three steps repetition cycles in good yields. Several different hybrid polymeric materials were explored combining the three different material synthetic strategies including polymer conjugates shown in chapter 2, molecular brushes shown in chapter 3, water soluble A-B-A triblock copolymer shown in chapter 4. Firstly, two well-defined statistical copolymers poly(styrene-co-3-azidopropyl methacrylate) and poly(3-O-methacryloyl-1,2:5,6-di-O-isopropylidene-[subscript D]-glucofuranose -co-AzPMA) were synthesized by RAFT. An exemplary N-alkyl urea peptoid trimer was synthesized and conjugated to the two copolymers through the 'click' reaction of the azide pendent group of polymers with the complilanry alkene group at N-alkyl urea peptoid. The polymer conjugates were subjected to further post-modification to generated fluorescent conjugates or water soluble materials. Following the explore of conjugation, N-alkyl urea peptoid was used as comonomer to synthesize linear poly(N-alkyl urea peptoid). The RAFT agent was introduced onto the linear polymer generated by step growth polymerization once again through 'click' reaction. Sequentially, styrene and tert-butyl acrylate was grown from RAFT agents sites that fused onto the poly(N-alkyl urea peptoid) backbone to make block copolymer arms. Upon removal of the tert-butyl groups, the molecular brushes were observed to generate micelles in aqueous solution. The self-assembly N-alkyl urea peptoid was then investigated and conjugated to water soluble polymer poly(ethylene glycol) to produce a A-B-A block copolymer that self-assembled into ribbons in aqueous solution. The final two part of dissertation was about gelling materials studies starting with presenting a synthesis strategy for low molecular weight organogelators (LMOG) using the ureidopyrimidinone (UPy) group functioned N-alkyl urea peptoid. The surprising observation of gelation in DMSO led to extensive investigation of the gelification mechanism studies. Based on the lessons of LMOG, the copolymerization of different T[subscript g] monomers with quadruple hydrogen bonding containing methacrylate was demonstrated suitable to produce polymeric organogelators in the final chapter.
Download or read book Polymer Supported Chemical Reactions written by P. Hodge and published by iSmithers Rapra Publishing. This book was released on 1991 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer supported chemical reactions may include those using supported substrates, reagents and catalysts, and this report describes all three types. In all cases the most frequent reason for the use of a polymeric support will be the ease of separation of the supported and the low molecular c099 species. An additional indexed section containing several hundred abstracts from the Rapra Polymer Library database provides useful references for further reading.
Download or read book Synthesis and Characterization of Interpenetrating Polymer Network Resins Polymer Foam supported Ligands and Polystyrene polyphenolic Ion complexing Reagents written by Robert A. Beauvais and published by . This book was released on 1997 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Characterization of Hydroxy terminated Dinitropropyl Acrylate Polymers written by Allen L. Dodge and published by . This book was released on 1981 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of New Polymer Supported Reagents written by Kwok-Wai Matthew Choi and published by . This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Development of New Polymer Supported Reagents" by Kwok-wai, Matthew, Choi, 蔡國偉, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled DEVELOPMENT OF NEW POLYMER SUPPORTED REAGENTS Submitted by Choi Kwok Wai Matthew for the degree of Master of Philosophy at The Universiry of Hong Kong in December 2003 The use of polymer-supported reagents has emerged as a powerful technique in organic synthesis in what is known as polymer-assisted organic synthesis. The inherent advantages of attaching reagents to insoluble supports lie in the ease of product purification, since the supports can be filtered and also because a given reaction can be driven to completion through the convenient use of excess of such reagents. Soluble polymers are alternative supports to insoluble resins for reagent delivery and this are becoming widely used. These reagents may be used to either selectively remove impurities from synthetic products or to deliver reagents to dissolved synthesis substrates A series of new polymer-supported reagents based on both non-cross- TM linked and cross-linked (JandaJel ) polystyrene were prepared and the utility of these polymers was demonstracted by their use in organic synthesis. In this thesis, the development of two new soluble polystyrene-based sulfoxide reagents for Swern oxidation reactions are introduced. i Secondly, a simplified synthesis of 4-styryldiphenylphosphine is described and used this monomer to prepare non-cross-linked polymer-supported triphenylphosphine using a homogeneous polymerization process. It is noteworthy that the 4-styryldiphenylphosphine monomer can be incorporated into the polymers at predictable levels, depending upon the ratio of monomers used in the polymerization reaction. The utility of this polymer was demonstrated by its use in Mitsunobu reactions. Thirdly, a straightforward synthesis of trityl alcohols in which one of the aryl rings is substituted with a vinyl group was presented. These compounds were used to incorporate trityl linker groups in polystyrene-based reagent supports. TM Both non-cross-linked and cross-linked (JandaJel ) polystyrene can be prepared with these monomers and these polymers are suitable as supports for solid-phase organic and peptide synthesis. Finally, a new cross-linked polystyrene-supported thioanisole reagent was reported. This reagent incorporates the flexible JandaJel cross-linker and can be treated with methyl trifluoromethanesulfonate to form the corresponding sulfonium salt. This salt in turn can be deprotonated to form a polymer-supported sulfur ylide that is able to react with carbonyl compounds to form epoxides. The thioanisole reagent can also be oxidized to form an insoluble sulfoxide reagent that is useful in Swern oxidation reactions. These reagents derived from the polymer-supported thioanisole can be recovered, regenerated, and reused. DOI: 10.5353/th_b2923052 Subjects: Polymers Supported reagents
Download or read book Synthesis and Characterization of Low Molecular Mass Amphiphilic Block Copolymers and Potential Use in Surfactant Assisted Particle Micro mixing written by Ekaterini Karakatsanis and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In industry the effective mixing and de-agglomeration of two solid particles is vital in applications that require the intimate contact of homogeneously mixed reagents. One such application is in the preparation of pyrotechnic delay elements with reproducible burn speeds. The concept of surfactant assisted particle micro-mixing is proposed. This theory is based in the use of two amphiphilic polymeric surfactants to form two separate stable dispersions of the two solid particles to be mixed, but with the subsequent requirement that the dispersants are able to interact with each other. The formation of the individual dispersions allows for the deagglomeration of the particles and thus their preparation for homogeneous mixing, which is facilitated by the interacting surfactants. Low molecular mass block copolymers of styrene and acrylic acid and poly(ethylene oxide)-poly(propylene oxide) (PEO-PPO) surfactants are the proposed dispersants which will allow for the surfactant interaction by means of hydrogen bonding between the poly(acrylic acid) block and the PEO. The poly(styrene-co-acrylic acid) block copolymer will be synthesised via Atom Transfer Radical Polymerisation (ATRP) and subsequently used in the dispersion experiments. The synthesis of the polystyrene macroinitiators to initiate the block copolymerisation of the t-butyl acrylate was carried out satisfactorily, with good molecular masses and molecular mass distributions. In addition, lH-NMR analysis carried out on the polystyrene macroinitiators confirmed their synthesis. The use of the polystyrene macroinitiators was successful in synthesising poly(styrene-co-t-butyl acrylate) block copolymers with slightly higher polydispersities in comparison to the macroinitiatiators themselves, but acceptable. Hydrolysis of the poly(styrene-co-t-butyl acrylate) block copolymer to poly(styrene-co-acrylic acid) was successful in the presence of trifluoroacetic acid as catalyst. Attempts to hydrolyse in basic conditions (NaOH) and alternatively in acidic conditions (HCI) were not successful. Use of the poly(styrene-co-acrylic acid) amphiphilic block copolymer to emulsion polymerise styrene requires the ionised form of the polymer and was therefore not favourable to observe surfactant-surfactant hydrogen bonding. In addition, attempts to synthesise a wax emulsion stabilised by a PEO containing surfactant proved to be unsuccessful. Subsequently, the micro-mixing experiments were carried out by using a poly(acrylic acid) stabilised melamine dispersion and a commercially available PEO containing surfactant stabilised wax emulsion. The interaction between the melamine and the poly(acrylic acid) allows for the formation of a stable melamine dispersion at above 7% poly(acrylic acid) : melamine ratio (mass basis). Analysis by SEM shows that without the poly(acrylic acid) dispersant no wax particles are found to occur on the melamine particle surface. However, in an attempt to determine whether the amount of wax interaction increases with poly(acrylic acid) content, it was found that in the absence of poly(acrylic acid) dispersant, the most amount of wax precipitated out with the melamine. This is possibly attributable to the preferential occlusion of the wax particles between the melamine particles rather than surface attachment. Introduction of the poly(acrylic acid), however, shows via SEM analysis that the hydrogen bond interaction between the acrylic acid group and the ethylene oxide group does occur, since the attachment of the wax particles on the melamine particle surface is observed. Although results show that the surfactant-surfactant interaction allows for the micro mixing of particles, some refinement is required with respect to the systems that this phenomenon can be applied to. In addition, factors such as particle type, particle size and surfactant type will influence the micro-mixing interaction. It is therefore recommended that these factors be investigated in order to completely identify the micro-mixing phenomenon.
Download or read book Synthesis and Characterization of New Multifunctional Initiators for Anionic Polymerization and the Use of Poly 4 hydroxystyrene as a Template for New Polymers written by Christopher Michael Hurley and published by . This book was released on 2016 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation explores the synthesis and use of multifunctional anionic polymerization initiators for the purpose of opening the gateway to the synthesis of polymer architectures of greater complexity. First the multifunctional oxyanion initiator generated by reacting poly(4-hydroxystyrene) with sodium hydride was used to synthesize a previously unknown polymer containing an aryl halide functional group. The homopolymer solution self-assembly behavior of poly(4-hydroxystyrene) and the newly synthesized poly (4-(4-bromophenyloxy)styrene) were both investigated. This is followed by the synthesis and characterization of multifunctional alkyne core molecules and random copolymers of polystyrene-co-poly(4-hydroxystyrene) which served as templates for the synthesis of new random copolymers of polystyrene-co-poly(4-(2- propynyloxy)styrene). The newly formed multifunctional alkyne core molecules and alkyne functionalized random copolymers served as polymer backbones in a "grafting to" strategy. Previously prepared azide terminated polymers were grafted to the multifunctional alkyne core molecules and polymer backbones by copper (I) catalyzed alkyne-azide cycloaddition reactions. Lastly, the synthesis of a new hydrocarbon soluble multifunctional initiator was undertaken. The resulting molecule was shown to be an efficient initiator of anionic polymerization in non-polar solvent in the absence of polar additives, necessary in all previous attempts to combat large scale aggregation of such multifunctional initiator. This new initiator will open the way to facile synthesis of well-defined star polymers, star-block copolymers, and more complex polymer architectures.
Download or read book Journal of Scientific Industrial Research written by and published by . This book was released on 1993 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Characterization of Benzyl Acrylate Polymers and Their Incorporation Into Polyelectrolye Films written by Nikhilesh K. Desai and published by . This book was released on 2001 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymer Supported Reagents and Catalysts written by and published by . This book was released on 2005 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
