2 edition of Conversion of polymers of methyl- and vinylsilane to Si-C ceramics found in the catalog.
Conversion of polymers of methyl- and vinylsilane to Si-C ceramics
1994 by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, D.C.], [Springfield, Va .
Written in English
|Statement||Frances I. Hurwitz ... [et al.].|
|Series||NASA technical memorandum -- 106554.|
|Contributions||Hurwitz, Frances I., United States. National Aeronautics and Space Administration.|
|The Physical Object|
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Conversion of Polymers of Methyl-and Vinylsilane to Si-C Ceramics Frances 1. Hurwitz Lewis Research Center Cleveland, Ohio and Terrance A. Kacik, Xin-Ya Bu, John Masnovi, Paula J. Heimann, and Kassahun Beyene Cleveland State University Cleveland, Ohio Prepared for the MRS Spring Meeting sponsored by the Materials Research SocietyFile Size: 6MB.
Poly(vinylsilane) produced a carbon-rich Si-C ceramic in which the carbon was dispersed on a sufficiently fine level to show resistance to oxidation on heating in air to °C. Copolymerization of methyl- and vinylsilane produced stoichiometric SiC; however, polymers of methylsilane were sensitive to oxygen incorporation and sometimes Cited by: Get this from a library.
Conversion of polymers of methyl- and vinylsilane to Si-C ceramics. [Frances I Hurwitz; United States. National Aeronautics and Space Administration.;]. Scientists from various different fields use organo-trialkoxysilanes and tetraalkoxysilanes in a number of applications.
The silica-based materials are sometimes synthesized without a good understanding of the underlying reaction kinetics. This literature review attempts to be a comprehensive and more technical article in which the kinetics of alkoxysilanes polymerization are by: 8.
Pyrolytic conversion of methyl- and vinylsilane polymers to Si-C ceramics F. Hurwitz, T. Kacik, Xin-Ya Bu, J. Masnovi Pages Richardson, M.O.W. Polymer engineering composites / edited by M.O.W. Richardson Applied Science Publishers London Wikipedia Citation Please see Wikipedia's template documentation for further citation fields that may be required.
Introduction. Silicon carbide (SiC)–boron carbide (B 4 C) ceramic composites exhibit excellent mechanical properties, especially in terms of fracture toughness.However, in the literature such composites are well investigated either in the SiC-rich region with overall boron content well below 5 wt%, or boron-rich compositions with B to Si ratio exceeding by: 8.
conversion of preceramic polymers has gained considerable attention in recent years due to their unique combination of low temperature processing, applicability of versatile plastic shaping technologies and microstructural control capabilities.
In the present work, phenyl (PPS) and. Si-based ceramics, involves the conversion of polymer fibers containing Si, C, N, and B to an amor- phous Si x C y N z B b fiber that is thermally stable to ca.
°C . In addition to. Journal of the European Ceramic Society 12 () Thermal Behavior of Polymer-derived Ceramics. Si-C and Si-C-O Systems from both Commercial and New Polycarbosilane (PCS) Precursors O. Delverdier, M.
Monthioux Laboratoire Marcel Mathieu, UMR CNRS-DRET-UPPA, Centre HGlioparc, 2 Av. Du Prdsident P. Angot, Pau, France D. Mocaer & R. Pailler Cited by: Conversion of Polymers of Methyl- And Vinylsilane To Sic Ceramics (vinylsilane) were synthesized using a titanocene catalyst, and their pyrolytic conversion to ceramics was followed using a.
Si-based ceramics, involves the conversion of polymer fibers containing Si, C, N, and B to an amor-phous Si xC yN zB b fiber that is thermally stable to ca. °C . In addition to processability and a high conversion yield to the desired ceramic product, the ability to control the composition and.
A method in which radical polymerization of a vinyl monomer is initiated by an ozonide group attached to a silane or a siloxane polymer. The method is particularly useful for preparing organic polymers having a silicone chain end, or for preparing wide ranges of silicone/organic polymers and copolymers with varied architecture, i.e., ABA block copolymers, comb polymers, star polymers, and Cited by: 5.
This is a process between vinylsilanes and olefins, involving the activation of the =C–H bond at the α and β carbon atom of the vinyl group and the C vinyl –Si bond in the vinylsilane molecule, with simultaneous elimination of the ethylene molecule catalyzed by TM–H/Si (TM = Ru, Ir, Rh, etc.) complexes (the insertion–elimination Cited by: 3.
design of ceramics with specific properties . In the field of composite materials, the organo- metallic polymer route has been widely developed for producing SiC-based fibres from a variety of organo- silicon precursors, the most important contribution being that of Yajima et al. .
The processing route ofFile Size: 1MB. Journal J. Ceram. Soc., 93  – () DOI: /jx r The American Ceramic Society Polymer-Derived Ceramics: 40 Years of Research and Innovation in Advanced Ceramics Paolo Colombow Dipartimento di Ingegneria Meccanica—Settore Materiali, University of Padova, Padova, Italy.
Table A Partial History of Non-Oxide Ceramics from Polymer Pyrolysis Inorganic Polymers/Precursors Resultant Ceramic Reference Polycarbosilane SiC Polysilastyrene \ SiC 16 Polytitanocarbosilane Si-Ti-C-0 17 Polyzirconocarbosilane Si-Zr-C-0 18,19 Polysilazancs Si-C-N 20 23 Carboranesiloxane SiC-B 4 C 24 [Al-N(H)Si(CH 3) 3 ] 2 AIN A key feature of these polymers is that substantially all of the linkages between the Si--C units are "head-to-tail", i.e., they are Si to C.
A preferred embodiment of this invention is the polycarbosilane "SiH 2 CH 2" which has a carbon to silicon ratio of 1 to 1 and where substantially all of the substituents on the polymer backbone are hydrogen.
This involved synthesis of new types of organosilicon and boron polymers with latent (reactive) functionality suitable for thermal cross-linking, so that on pyrolysis high yields of ceramics can be obtained and the destructive effect of evolved gases minimized.
Pyrolysis mechanism studies. Chemical modification of existing preceramic : Dietmar Seyferth. ABSTRACTThe joining of SiC ceramic using the liquid polyvinylphenylsiloxane at the high temperature was investigated. The characteristic evolution of polyvinylphenylsiloxane during heating process, shear strength and microstructure of joint were especially discussed.
The results show that active groups Si-OH and CH=CH2 of polyvinylphenylsiloxane through cross-linking at low temperature (°C Cited by: 4. Ian Fleming was born in Staffordshire, England, in He studied at Pembroke College, Cambridge, where he obtained his B.A.
in and his Ph.D. inthe latter on the synthesis of acetylenic compounds and on the cyclobutane-forming reactions of enamines with electrophilic alkenes, supervised by Dr. John by: This banner text can have markup.
web; books; video; audio; software; images; Toggle navigation. Direct Chemical Synthesis of Chiral Methanol of 98% ee and Its Conversion to [2 H 1, 3 H]Methyl Tosylate and [2 H 1, 3 H-Methyl]Methionine Biljana Peric Simov, Frank Wuggenig, Kurt Mereiter, Hendrik Andres, Julien France, Peter Schnelli, and Friedrich HammerschmidtCited by: Catalytic hydrosilylation represents a straightforward and atom-efficient methodology for the creation of C–Si bonds.
In general, the application of homogeneous platinum complexes prevails in industry and academia. Herein, we describe the first heterogeneous single atom catalysts (SACs), which are conveniently prepared by decorating alumina nanorods with platinum by: Several methods have been described to produce small-sized Si 3 N 4 and/or SiC powders in a homogeneous mixture, such as: plasma synthesis, in which Si 3 N 4 particles or Si-C-N powders are carbon-coated 2,3; generation in situ of micrometer size b-Si 3 N 4, from Si powder with flowing N 2 /H 2 gas mixture reaction on SiC particles 7; and.
USA1 US11/, USA USA1 US A1 US A1 US A1 US A US A US A US A1 US A1 US A1 Authority US United States Prior art keywords adhesive preferably weight parts occurrence Prior art date Legal status (The legal status Cited by: Si-C-N powders are carbon-coated2,3; generationin situof micrometer size β-Si3N4, from Si powder with flowing N2/H2 gas mixture reaction on SiC particles 7; and poly-meric precursors1,8,9.
This last route offers the possibility of improving the compositional homogeneity and tailoring the composition and molecular structure of the ceramic powders. properties of these polymers more thoroughly, we also synthesized the well-defined, closely related tetramethylamide functionalized disiloxane () and aliphatic-functionalised disiloxane model compounds and.
It was envisaged that the bridged compounds with amide and. * Much progress has been made in the last 8 years in understanding the theory and practice of silane coupling agents. A major advance in this direction was the measurement of true equilibrium constants for the hydroly sis and formation of siloxane bonds.
BDE of the C-O bond ( kcal mol-1), C-C bond ( kcal mol-1), and Si-C bond (76 kcal mol-1),6 which explains the excellent thermal stability of polyorganosiloxanes.
In addition, PDMS has a good gas permeability7 and is transparent to visible and UV light (the methyl groups do. The product of N-(2-aminoethyl)-3 aminopropyltrimethoxysilnae with 2 mol of maleic anhydride is reported to be a good coupling agent for unsaturated polyesters and many thermoplastic polymers.
24 The same diamine-functional silane with a slight excess of isophthalic acid is a convenient acid-functional silane for "ionomer bonding" of polymers. The majority of the weight loss on conversion occurs below degrees C, although bond rearrangement continues to degrees C.
Poly(vinylsilane) produced a C-rich Si-C ceramic in which the carbon was dispersed on a sufficiently fine level to show resistance to oxidation on heating in air to degrees C. Organosilicon Chemistry I1 Edited by N. Auner and J. Weis 0 VCH Verlagsgesellschaft mbH.
D 1 Weinheim (Federal Republic of Germany), Distribution: VCH, P.O. Box 10 11 61, D Weinheim (Federal Republic of Germany) Switzerland: VCH, P.O. Box, CH Base1 (Switzerland) United Kingdom and Ireland: VCH (UK) Ltd., 8 Wellington Court, Cambridge CB1 1HZ (England) USA.
The book is divided into three main parts: Part I, entitled Polymers and Fillers, contains a general introduction to polymer composites, a review of the parameters affecting mechanical and rheological properties of polymers containing functional fillers and an overview of mixing and compounding equipment along with methods of filler.
Mater. 25, S Macosko Chris Toughening Polymers with Functionalize Graphene Oxide Graphene oxide (GO) can be prepared economically from graphite.
The epoxide and hydroxyl groups on provide many opportunities for attaching functional groups to the surface of GO. These can aid its dispersion in polymers and grafting to reactive systems. Vol. SILICONES. SILICONES Introduction Silicones are a class of polymers having the formula (Rm Si(O)4 m/2)n, where m = 13 and n 2.
The most common are the polydimethylsiloxanes (PDMS). Silicones and silanes are the subject of many reviews (18). Commercial products include uids, lled uids and gums, greases, resins, and rubber (1,2). 享vip专享文档下载特权; 赠共享文档下载特权; w优质文档免费下载; 赠百度阅读vip精品版; 立即开通Read: Thus, organic polymers or ceramic coatings with improved toughness w5x, elasticity, low surface energy w6,7x, enhanced hardness w8,9x, chemical, radiation and heat resistance w10x, availability of reactive functional groups or catalytically active host sites w11–13x, can be produced by interpenetration w14,15x, inclusion w16x or dispersion Read: 講演番号,和文演題,和文研究場所,発表者氏名,和文キーワード,開始時刻,終了時刻,発表日,会場,発表順,大会コード,英文演題,研究場所英文,発表者氏名英文,英文キーワード 1A,バイサルファイトフリーなメチル化DNA解析法,理研基幹研・JSTさきがけ,岡本 晃充,DNAメチル化・エピジェネティクス.
HURWITZ F I. Pyrolytic conversion of methyl- and vinylsilane poly-mers to Si–C ceramics [J]. J Mater Sci,–  SCHILLING C L. Polymeric routes to silicon carbide [J].