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  • 1
    Electronic Resource
    Electronic Resource
    Halogenation of polymers by dichlorodifluoromethane (1991)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 188 (1991), S. 27-40 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Fluorierung von Polyethylen und Polyvinylalkohol wurde mit Dichlordifluormethan CCl2F2 (Freon 12) unter Verwendung von Cobalt-60 γ-Strahlung bzw. elektrischer Lichtbogenentladung durchgeführt und der Einfluß von Reaktionstemperatur und -zeit, Katalysator, Verdünnung etc. untersucht. Dabei wurde bei Polyethylen sowohl die Fluorierung als auch die gleichzeitige Chlorierung beobachtet, wobei der Anteil an Fluorierung bei elektrischer Lichtbogenentladung gewöhnlich höher war als bei Verwendung von γ-Strahlung; in beiden Fällen war dennoch die Chlorierung deutlich bevorzugt. Bei Polyvinylalkohol konnten noch höhere Fluorierungs-bzw. Chlorierungsgrade ermittelt werden.
    Notes: Fluorination of polyethylene and polyvinyl alcohol was carried out by dichloro-difluoromethane under cobalt-60 gamma radiation and under electric spark discharge. The effect of temperature, reaction time, catalyst, inert diluent etc. was studied. Simultaneous chlorination of the polymer samples was observed along with fluorination. The extent of fluorination under electric spark discharge is usually higher than that under gamma radiation. Again, the extent of chlorination is higher than that of fluorination in both the cases. The extent of fluorination as well as chlorination is the highest in case of polyvinyl alcohol.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1991.051880103
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Data Mining and Pattern Recognition Models for Identifying Inherited Diseases: Challenges and Implications (2016)
    Frontiers Media
    Details
    Publication Date: 2016-08-10
    Electronic ISSN: 1664-8021
    Topics: Biology , Medicine
    Published by Frontiers Media
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  • 3
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    Fatigue characterization of advanced carbon-carbon composites (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Response of quasi-isotropic laminates of SiC coated Carbon-Carbon (C/C) composites under flexural fatigue are investigated at room temperature. Virgin as well as mission cycled specimens are tested to study the effects of thermal and pressure cycling on the fatigue performance of C/C. Tests were conducted in three point bending with a stress ratio of 0.2 and frequency of 1 Hz. Fatigue strength of C/C has been found to be considerably high - approximately above 85 percent of the ultimate flexural strength. The fatigue strength appears to be decreasing with the increase in the number of mission cycling of the specimens. This lower strength with the mission cycled specimens is attributed to the loss of interfacial bond strength due to thermal and pressure cycling of the material. C/C is also found to be highly sensitive to the applied stress level during cyclic loading, and this sensitivity is observed to increase with the mission cycling. Weibull characterization on the fatigue data has been performed, and the wide scatter in the Weibull distribution is discussed. Fractured as well as untested specimens were C-scanned, and the progressive damage growth during fatigue is presented.
    Keywords: COMPOSITE MATERIALS
    Type: In: International Congress on Experimental Mechanics, 7th, Las Vegas, NV, June 8-11, 1992, Proceedings. Vol. 2 (A94-12901 02-39); p. 1368-1373.
    Format: text
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  • 4
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    Fatigue and flexural response of advanced carbon-carbon composites at room and elevated temperatures (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The flexural response of SiC-coated carbon-carbon composites (ACC-4) at room and elevated temperatures is presented. Three-point bending tests were performed on virgin and mission-cycled specimens, and the variation in flexural strength is examined. The load-deflection behavior of the material at various temperatures is investigated, and the Weibull (1939) analysis of the strength data is performed. Micrographs of various cross sections in the damaged zone were taken, and the failure mechanisms are discussed. Fatigue tests were conducted under flexural loads, and the S-N diagram with the corresponding Weibull analysis are presented. Untested as well as fractured specimens under static and dynamic loading were C-scanned to identify the damaged zone and visualize the extent of the damage. Failure analyses are presented for both static and cyclic loading on the basis of NDE, the micrographs, and the experimental data.
    Keywords: COMPOSITE MATERIALS
    Type: Ceramic Engineering and Science Proceedings (ISSN 0196-6219); 13; 8-Jul
    Format: text
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  • 5
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    A combined experimental and finite element study to predict the failure mechanisms in SiC coated carbon/carbon composites at room and elevated temperatures under flexural loading (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Response of quasi-isotropic laminates of SiC coated Carbon/Carbon (C/C) composites have been investigated under flexural loading at various temperatures. Variation of load-deflection behavior with temperatures are studied. Increase in flexural strength and stiffness are observed with the rise in temperature. Extensive analyses through Optical Microscope (OM) and Non-Destructive Evaluation (NDE) have been performed to understand the failure mechanisms. Damage zone is found only within the neighborhood of the loading plane. Isoparametric layered shell elements developed on the basis of the first order shear deformation theory have been used to model the thin laminates of C/C under flexural loading. Large deformation behavior has been considered in the finite element analysis to account for the non-linearities encountered during the actual test. Data generated using finite element analysis are presented to corroborate the experimental findings, and a comparison in respect of displacement and stress-strain behavior are given to check the accuracy of the finite element analysis. Reasonable correlation between the experimental and finite element results have been established.
    Keywords: COMPOSITE MATERIALS
    Type: Journal of Reinforced Plastics and Composites (ISSN 0731-6844); 12; 7; p. 825-842.
    Format: text
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