Download or read book Kinetic Study of Ion sensitized Terminations of Radical Polymerisation written by E. A. S. Cavell and published by . This book was released on 1961 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: A kinetic study of the polymerisation of acrylamide initiated by the thermal catalyst 4-4'-azo-bis-4-cyanopentanoic acid showed that up to 10% conversions the rate of polymerisation is directly proportional to the concentration of monomer and to the square root of the concentration of catalyst. In the presence of ferric perchlorate and decimolar perchloric acid, however, the overall rate of polymerisation is reduced and the rate now becomes directly proportional to the first power of the catalyst concentration and inversely proportional to the concentration of ferric ions present. (Author).

Download or read book Kinetic Study of Ion sensitized Termination of Radical Polymerisation written by E. A. S. CAVELL and published by . This book was released on 1963 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rates of linear termination of polymerisation by metal perchlorates (Fe, V, U) were measured at different temperatures and Arrhenius parameters determined. No correlation between rate constant and any thermodynamic property was found. Rate constants for termination by ferric chloride and sulphate were much greater than that for termination by ferric perchlorate. Uranyl perchlorate and ferric chloride were found to initiate polymerisation by a thermal mechanism. (Author).

Download or read book Technical Abstract Bulletin written by and published by . This book was released on with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government wide Index to Federal Research Development Reports written by and published by . This book was released on 1966 with total page 1466 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Kinetics of Free Radical Polymerization written by Alastair M. North and published by Pergamon. This book was released on 1966 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Non Radical Polymerisation written by R.G. Compton and published by Elsevier. This book was released on 1976-01-01 with total page 675 pages. Available in PDF, EPUB and Kindle. Book excerpt: Non-Radical Polymerisation

Download or read book U S Government Research Development Reports written by and published by . This book was released on 1966-11 with total page 1014 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Review of the Air Force Materials Research and Development Program written by Air Force Materials Laboratory (U.S.) and published by . This book was released on 1964 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: Technical reports published by the Air Force Materials Laboratoy during the period 1 July 1962 - 30 June 1963 are abstracted herein. Reports on reseqrch conducted by the Air Force Materials Laboratory personnel as well as that conducted on contract are included. These reports cover basic and applied research in the materials area being conducted by the Metals and Ceramics Division, Non-metallic Materials Division, Materials Physics Division, Manufacturing Technology Division, and Materials Applications Division of the Air Force Materials Laboratory.

Download or read book A Review of the Air Force Materials Research and Development Program written by United States. Wright Air Development Division and published by . This book was released on 1954 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Radical Polymerization Kinetics in Aqueos Solution and in Systems with Secondary and Tertiary Radicals Studied by Novel Pulsed Laser Techniques written by Pascal Hesse and published by Cuvillier Verlag. This book was released on 2008-08-08 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract Rate coefficients of propagation, kp, of termination, kt, and of intramolecular transfer-to-polymer, kbb, have been studied via pulsed-laser polymerization (PLP) methods for systems with strong intermolecular interactions, such as hydrogen bonds, and for polymerizations with two types of distinctly different radicals being present. The propagation kinetics of methacrylic acid (MAA) and N-vinyl pyrrolidone (NVP) in aqueous solution has been investigated by the PLP-SEC technique which combines PLP-initiation with subsequent analysis of the produced polymer by size-exclusion chromatography. The experimental conditions of monomer concentration, temperature, pressure and degree of monomer ionization have been varied in wide ranges. The dependence of kp on monomer-to-polymer conversion has been determined from PLP-SEC experiments with pre-mixed polymer. The variation of kp may be adequately explained by the interaction of solvent and monomer molecules with the transition state structure for propagation. The termination rate coefficients of MAA and NVP have been studied by the SP PLP NIR method in which the change in monomer concentration after single pulse (SP) initiation is monitored via s time-resolved near infrared spectroscopy (NIR). The variations of kt with conversion for different initial monomer concentrations reflect the diffusion-controlled character of the termination step with kt being governed by segmental, translational, and reaction diffusion. In acrylate polymerization backbiting reactions may occur by which chain-end secondary propagating radicals (SPR) are transformed into tertiary midchain radicals (MCR) via 1,5-hydrogen shift. MCRs can react back to SPRs by monomer addition. The basic kinetic scheme has to be extended for additional reactions steps, as SPR and MCR species show widely different kp and kt, respectively. The impact of MCR formation on the applicability of the experimental techniques for kp and kt determination, i.e. PLP-SEC and SP-PLP-NIR, was investigated by PREDICI simulations. A novel experimental method has been developed by which kbb and the rate coefficient for monomer addition to the MCR, kpt, for butyl acrylate (BA) have been determined from PLP-SEC experiments carried out under extended variation of laser pulse repetition rates. Insights into the kinetics, especially of the termination reactivity of secondary and tertiary acrylate radicals, have been obtained by measurements of full electron spin resonance (ESR) spectra under stationary UV and pseudo-stationary PLP initiation, respectively, or by time-resolved monitoring of SPR and MCR concentrations after application of a laser single pulse (SP-PLP-ESR). By the latter technique also chain-length-dependent individual kt values are accessible. For acrylic acid (AA) polymerization in aqueous solution, the complexities associated with strong solvent effects on the rate coefficients and with the pronounced MCR build-up add to each other. Attempts were made to consider the resulting consequences for the kinetic data of AA polymerization in aqueous solution published so far.

Download or read book Air Force Research Resum s written by and published by . This book was released on 1961 with total page 1206 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government wide Index to Federal Research Development Reports written by and published by . This book was released on 1966 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Review of the Air Force Materials Research and Development Program written by Donna J. Tate and published by . This book was released on 1962 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: These reports cover basic and applied research in the materials area being conducted by the Metals and Ceramics, Non-metallic Materials, Physics, Manufacturing Technology and Applications Laboratories of the Directorate of Materials and Processes.

Download or read book Government Reports Annual Index written by and published by . This book was released on 1991 with total page 1332 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1973 with total page 1412 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1980 with total page 748 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1973 with total page 978 pages. Available in PDF, EPUB and Kindle. Book excerpt: