Download or read book Synthesis and Characterization of Thiophene based High Performance Polymers written by Valerie Vanessa Sheares and published by . This book was released on 1994 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sulfur Containing Polymers written by Xing-Hong Zhang and published by John Wiley & Sons. This book was released on 2021-03-23 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: A must-have resource to the booming field of sulfur-containing polymers Sulfur-Containing Polymers is a state-of-the-art text that offers a synthesis of the various sulfur-containing polymers from low-cost sulfur resources such as elemental sulfur, carbon disulfide (CS2), carbonyl sulfide (COS) and mercaptan. With contributions from noted experts on the topic, the book presents an in-depth understanding of the mechanisms related to the synthesis of sulfur-containing polymers. The book also includes a review of the various types of sulfur-containing polymers, such as: poly(thioester)s, poly(thioether)s and poly(thiocarbonate)s and poly(thiourethane)s with linear or hyperbranched (dendrimer) architectures. The expert authors provide the fundamentals on the structure-property relationship and applications of sulfur-containing polymers. Designed to be beneficial for both research and application-oriented chemists and engineers, the book contains the most recent research and developments of sulfur-containing polymers. This important book: Offers the first comprehensive handbook on the topic Contains state-of-the-art research on synthesis of sulfur containing polymers from low-cost sulfur-containing compounds Examines the synthesis, mechanism, structure properties, and applications of various types of sulful-containing polymers Includes contributions from well-known experts Written for polymer chemists, materials scientists, chemists in industry, biochemists, and chemical engineers, Sulfur-Containing Polymers offers a groundbreaking text to the field with inforamtion on the most recent research.

Download or read book Synthesis and Characterization of Novel Conjugated Polymers Based on Thiophene Building Blocks written by Chenggang Wang and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Polyimides and Other High Temperature Polymers Synthesis Characterization and Applications written by Kash L. Mittal and published by CRC Press. This book was released on 2007-07-10 with total page 435 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is mostly based on papers presented at the Fourth International Symposium on this topic held in Savannah, Georgia. However, in addition to these papers, certain very relevant papers have also been included to broaden the scope and thus enhance the value of this book. Currently there is tremendous interest in these material because of their unique properties and applications in diverse technological areas ranging from microelectronics to aerospace to adhesive bonding. This book is divided into three parts: Part 1: Synthesis and Bulk Characterization; Part 2: Surface and Interface Aspects (Composites and Metallization); and Part 3: Applications. The topics covered include: synthesis of a number of polyimides with tailored properties; nanocomposites for high-performance applications; molecular assembly of polyimides; polyimide L-B films; metallization of polyimides; applications of high temperature polymers as proton exchange membranes; dielectrics, and in textile.

Download or read book Polyimides and Other High temperature Polymers written by K. L. Mittal and published by BRILL. This book was released on 2009-04-24 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: The topics covered in this proceedings volume include: Synthesis, characterization and processing (including some novel approaches) of a variety of polyimides and other high temperature polymers; structure-property relationships; segmental dynamics in polyimide materials; photoalignable polyimides; photoconductivity and photosensitivity of polyimides; ultrafiltration membranes from polyetherimide; polymer materials for nonlinear optical applications; alignment of SWNTs in rigid-rod polymer compositions; surface modification of polyimide; adhesion of Cu to polyimide surfaces; and polyimide erosion in a low Earth orbit space environment.

Download or read book Polyimides and other high temperature polymers written by K. L. Mittal and published by VSP. This book was released on 2003-03 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Containing 32 peer-reviewed papers, this volume documents the proceedings of the international symposium of the same name (held under the aegis of the Materials Science and Technology Conferences) in December of 2001. Devoted to research into high-temperature polymers, the papers are organized into sections dealing with synthesis, properties, and bulk characterization in the first half and surface modification, interfacial or adhesion aspects, and applications in the second. Annotation (c)2003 Book News, Inc., Portland, OR (booknews.com).

Download or read book Synthesis and Characterization of Conducting Copolymers of Thiophene Functionalized Monomers and Polymers written by Özge Papila and published by . This book was released on 2003 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Characterization of Polythiophene Derivatives written by Xin Chen and published by ProQuest. This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In Chapter 1, the history of conducting polymers, especially polythiophene and its derivatives, was briefly reviewed. Different approaches of structural modifications to afford small bandgap polythiophene derivatives were discussed. The emergence of metal-containing polymers (metallopolymers) as functional materials has attracted tremendous attention around the world. Introduction of metals into thiophene-based oligomers and polymers, whether the backbone or the side chain of the pi-conjugated framework, the electronic, optical, or magnetic properties of the material are expected to be significantly affected by metals through various mechanisms. Synthesis methods to prepare poly(thienylene vinylene) were also briefly reviewed in this chapter. In Chapter 2, the motivations and objectives were briefly discussed. Two structurally similar compounds, thieno[3,4-d]-1,3-dithiole-2-thione and thieno[3,4-d]-1,3-dithiol-2-one are the starting point of this project due to their unique carbondithiolate structures, which may lead to metal-dithiolate coordinated oligomers or/and polymers, or polymers crosslinked by DTTTF units. For the preparation of monomers, six types of reactions were systematically studied with focus on thieno[3,4-d]-1,3-dithiol-2-one to prepare different direvatives. Different halogenated compounds, Mannich bases, chloromethylated compounds, a number of nucleophilic substituted derivatives and a DTTTF analogue from chloromethylated compounds were successful synthesized. All products were fully characterized through 1H and 13C-NMR, FT-IR, ESI-TOF high resolution mass spectroscopy. The halogenated products were prepared through halogensuccinimides or other halogenation reagents such as Br2, I2. These halogenated compounds may be candidates to prepare homopolymer and/or copolymers bearing carbondithiolate structures by cross-coupling reactions. 4,6-Bis(chloromethyl) thieno[3,4- d]-1,3-dithiol-2-one and its nucleophilic derivatives may be good monomers for the two-step precursor polymerization to achieve fully conjugated poly(thienylene vinylene) derivatives and even metallopolymers with metal-dithiolate coordinations. Attempted polymerization reactions to homopolymers and copolymers through directly C-C coupling, such as transitional metal catalyzed cross-coupling, Stille reaction, and Ullman reaction, et al. were discussed in the beginning of Chapter 3. Base-promoted and acid-promoted polymerizations were attempted to afford soluble precursor polymers with carbondithiolate structures. However, all the symmetrical thiophene derivatives did not successfully yield processable precursor polymers; asymmetrical monomers generated some possibilities for future study. Synthesis of thiophene-based oligomers, such as dimmers (dithienyl compounds), trimers (trithienyl compounds), and heptamers were also explored in chapter 3, followed by preparation of thiophene-based copolymers through Wittig-Horner reactions. Properties of oligomers, especially trimers were well characterized by NMR, FT-IR, and ESI-TOF. Several conjugated DTTTF derivatives from trimers were prepared by the triethyl phosphite cross-coupling method. These conjugated DTTTF compounds posses some unique properties. They are stable in solid forms, but may be doped in solution forms. The copolymers were characterized by elemental analysis, and FT-IR. UV-Vis spectra of copolymers show their bandgap values are aroud 1.87eV (UV edge calculation). In the Experimental chapter, all reaction conditions of preparation of new annulated thiophene derivatives and oligomers were documented in details. Physical and spectroscopic properties of these new compounds were also presented in this chapter. Key words. polythiophene, oligomer, conjugation, synthesis, characterization, DTTTF, metallopolymer.

Download or read book Synthesis and Characterization of Novel Regioregular Thiophene Polymers with Polyetheric Substitutes written by Elena Sheina and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book New Thiophene Based Materials written by and published by . This book was released on 1992 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our research is focused on the general synthesis of a new class of high performance aromatic thermoplastic and thermosetting engineering polymers from thiophene-based monomers. We are interested in the introduction of changes in polymers by an explicit geometric perturbation of the primary structure of the polymer chain substituting various amounts of thiophene into several classes of phenylene-based polymers. The anticipated property enhancements stem from unique molecular geometry of the aromatic 2,5-thiophene moiety; its nonlinear structure with an exocyclic bond angle of 148 deg is intermediate between that of 1,4-phenylene (1 80 deg) and 1,3-phenylene (1 20 deg) commonly used to prepare high performance materials. Often, the former are difficult to process and the latter exhibit poor mechanical properties. By focusing on the intermediate geometry of the thiophene moiety, we anticipate larger thermal processing windows without losing the desirable crystalline (and liquid crystalline) properties associated with the 1,4-phenylene-based materials. In addition, the bilateral asymmetry of the heterocycle will certainly influence the melting points, rates of crystallization, glass transition temperatures, solubility, miscibility with other polymers, adhesion, etc. relative to conventional phenylene-based materials. Our investigations of several distinct classes of polymers: thiophene-based poly(ester)s, poly(aramid)s, poly(benzoxazole)s, poly(arylene ether ketone)s, and poly(imide)s via the combination of a new route along with established methodologies will be presented.

Download or read book Synthesis and Characterization of Polymers Containing Oligothiophenes written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In the present work a series of thiophene oligomers of three and six thiophene units were synthesized, starting from thiophene, and characterized. Polymers containing these electroative side groups were then prepared by two strategies. The oligomers were attached to existing polymer systems and were connected to a polymerizable unit leading to monomer containing the oligothiophenes as side groups. Subsequently the properties of the monomers and the polymers were investigated. A butylcellulose derivative carrying terthienyl side chains (BCTTE, 26) was synthesized starting from cellulose acetate and 5-(2-chloroethyl)-2,2':5',2'-terthiophene (4). The polymer had a degree of substitution (DS) of the butyl and terthienyl side chains of DSbutyl = 1.9 and DSterth = 0.35, respectively. It was successfully spread on a Langmuir-Blodgett (LB) trough and then transferred to several solid substrates. X-rays reflectometry showed an ordered architecture of the cellulose backbones. However, the terthiophene side groups were found as isotropically aligned by polarized UV-Vis spectroscopy. When used as anode material in the electropolymerization of 3-pentylthiophene (28), polythiophene was grafted onto the cellulose backbone through the terthienyl side groups. The polythiophene chains showed an average anisotropic alignment of 20 % along the LB dipping direction, calculated by means of polarized UV-Vis spectroscopy. A second butylcellulose derivative carrying sexithienyl side chains (BCST) was synthesized and investigated, starting from butylcellulose and 2-[b ', b ''-dipentyl-5'''-(2-hydroxyethyl)-2,2': 5',2':5',2'':5'',2'':5'',2'''-sexithiophen-5-yl]-ethyl p-toluensulfonate (7). The polymer showed formation of stable LB monolayers at the air-water interface, but its transfer onto solid substrates was not successful. A poly(p-phenylene-ethynylene) bearing sexithienyl side chains (BzAcST, 31) was prepared by reaction of the two monomers 2-[b ', b ''-dipentyl-5'''-(2-hydroxyethyl)-2,2.

Download or read book Handbook of Thiophene Based Materials written by Igor F. Perepichka and published by John Wiley & Sons. This book was released on 2009-07-17 with total page 910 pages. Available in PDF, EPUB and Kindle. Book excerpt: This essential resource consists of a series of critical reviews written by leading scientists, summarising the progress in the field of conjugated thiophene materials. It is an application-oriented book, giving a chemists’ point of view on the state-of-art and perspectives of the field. While presenting a comprehensive coverage of thiophene-based materials and related applications, the aim is to show how the rational molecular design of materials can bring a new breadth to known device applications or even aid the development of novel application concepts. The main topics covered include synthetic methodologies to thiophene-based materials (including the chemistry of thiophene, preparation of oligomers and polymerisation approaches) and the structure and physical properties of oligo- and polythiophenes (discussion of structural effects on electronic and optical properties). Part of the book is devoted to the optical and semiconducting properties of conjugated thiophene materials for electronics and photonics, and the role of thiophene-based materials in nanotechnology.

Download or read book Polyimides and Other High Temperature Polymers Synthesis Characterization and Applications Volume 3 written by K. L. Mittal and published by CRC Press. This book was released on 2005-04-18 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: The topics covered in this proceedings volume include: Synthesis, characterization and processing (including some novel approaches) of a variety of polyimides and other high temperature polymers; structure-property relationships; segmental dynamics in polyimide materials; photoalignable polyimides; photoconductivity and photosensitivity of polyimides; ultrafiltration membranes from polyetherimide; polymer materials for nonlinear optical applications; alignment of SWNTs in rigid-rod polymer compositions; surface modification of polyimide; adhesion of Cu to polyimide surfaces; and polyimide erosion in a low Earth orbit space environment.

Download or read book Synthesis and Characterization of Pyrrole and Thiophene Semiconducting Polymers written by Hien Q. Nguyen and published by . This book was released on 2012 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chapter 3 describes the synthesis of novel low band gap conjugated thienodipyrrole squarine dye. Structural identification and characterization procedures are described. This donor-acceptor polymer had a low band gap and can be used in bulk heterojunction solar cells. Chapter 4 describes the synthesis of polyisoprene-b- polystyrene- b- poly(3-hexylthiophene) triblock copolymer by anionic coupling of living polyisoprene-b- polystyryl lithium with allyl-terminated poly(3-hexylthiophene). The opto-electronic properties and the morphology of the triblock copolymer are discussed in this chapter. The triblock copolymer has good opto-electronic properties and displayed nanofibrillar morphology.

Download or read book Synthesis Characterization and Application of Thiophene containing Conjugated Polymers written by Ailin Ding and published by . This book was released on 2000 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Organic Semiconducting Oligothiophenes and Thiophene Based Polyphosphazenes written by Kennedy Ogueri and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT Organic Semiconducting Oligothiophenes and Thiophene-Based Polyphosphazenes: Synthesis, Characterization, and Application by Kennedy S. Ogueri This work involves the synthesis and characterization of thiophene-based materials as well as their photochemistry with a view toward application in organic electronics. 2,5-Bis(trimethyltin)-thieno[3,2-b]thiophene (BTTT) oligomers were prepared by Stille coupling using a palladium catalyst. A combination of proton NMR, MALD-TOF, and optical spectroscopy was used to examine the systems. Steady-state fluorescence quenching behavior of BTTT dimers (with an alkyl side chain of C6 and C12) in the presence of four different n-type dopants (PC70BM, PC60BM, F4TCNQ, TCNQ) was studied in chloroform. At room temperature, in chloroform, BTTT dimers show fluorescence with a distinct peak at around 530 nm with a natural lifetime [tau]o ~ 6.907 x10-10 sec. The addition of dopant as a quencher to a solution of BTTT dimer does not form a complex in the ground state, and its excited state shows an efficient decrease in fluorescence intensity without distorting the shape and peak position of the fluorescence band. The fluorescence quenching reaction follows Stern-Volmer kinetics. The determined fluorescence quenching rate constants range from 1.91 x 1012 Lmol-1s-1 to 1.98 x 1014 Lmol-1s-1. The quenching mechanism is an oxidative process-electron transfer occurs from the singlet excited state of the dimers to the ground state of the dopant in chloroform. This study helps in the understanding of the nature of electrical doping by charge transfer in organic semiconductors. In an extension of this work, a new class of polyphosphazene electroactive materials was synthesized via macromolecular substitution, which integrates a --P=N- backbone with thiophene based side groups. The model reactions between the small-molecule cyclic phosphazene and each of the thiophene substituents were carried out first before applying the reaction to the high polymers. The synthesized thiophene-based polymers were subjected to chemical oxidation (oxidative coupling) to optimize their optical and electronic properties through side-chain chemistry. The redox interactions of the oxidized thiophene-based polyphosphazene with four different dopants were investigated, and their quenching coefficients determined. Furthermore, the fluorescence quenching interactions (except P1/F4TCNQ and P1/TCNQ) obey Stern-Volmer kinetics. Just like the BTTT systems, the quenching mechanism, in this case, is also an oxidative process (electron transfer transpires from the singlet excited state of the polymers to the ground state of the dopant in THF). These results lend credence to the application of thiophene-based polyphosphazene to organic electronics.

Download or read book Electroactive Polymers written by Muralisrinivasan Natamai Subramanian and published by Walter de Gruyter GmbH & Co KG. This book was released on 2021-01-18 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book focuses on the development of high performance, high efficiency electroactive polymers (EAPs), and electromechanically active polymers by controlling molecular chemical structure and morphology for all applications. This book is ideal for academicians and researchers in polymer and materials science.