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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 30 (1995), S. 5228-5236 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The influence of a co-cross-linkable processing aid, Trans-polyoctenylene (TOR), on hightemperature stress-strain properties and ageing of filled styrene butadiene rubber (SBR) vulcanizates, was studied. Three different cross-linking systems, conventional (CV), semiefficient (SEV) and efficient (EV), with respect to SBR were included. A linear regression equation has been obtained between vulcanizate modulus (200%), TOR dosage and sulphur/accelerator ratio at different test temperature. A similar equation has also been found with tensile strength at 120 °C. Thermal analysis, Fourier transform-infrared spectroscopy and a few solid-state 13Carbon nuclear magnetic resonance spectroscopic techniques were performed to get insight into the structural changes that occur between TOR and SBR during cross-linking. A plausible mechanism of the interaction between TOR and SBR has been suggested. Based on the property retention of the vulcanizates at room as well as at high working temperature, an optimization of properties between the CV and EV systems has been attempted by the modification of the CV system using TOR.
    Type of Medium: Electronic Resource
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  • 2
    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: Der Einfluß eines vernetzbaren Verarbeitungshilfsmittels, trans-Polyoctenylen (TOR), auf die Spannungs-Dehnungs-Eigenschaften von Vulkanisaten aus gefülltem Naturkautschuk (NR) bei hohen Temperaturen und nach einem Alterungsprozeß wurde systematisch untersucht. Zum Einsatz kamen drei verschiedene Vernetzungssysteme, ein konventionelles (CV), ein semi-effizientes (SEV) sowie ein effizientes (EV). Die beste Retention des 200%-Moduls und der Zugfestigkeit von NR bei hohen Temperaturen sowie nach der Alterung zeigte sich mit TOR für das CV-System. TGA-Messungen ergaben eine durch TOR bedingte erhöhte Stabilität der Elastomer/Polymer-Blends sowohl unter Sauerstoff als auch unter Stickstoff. Eine verbesserte thermische Stabilität wurde ebenfalls anhand der erhöhten Onset-und Peak-Temperaturen bei der Bestimmung der Rescan-Enthalpien mit DSC beobachtet. FTIR-(ATR)-Spektren zeigen allerdings keine Wechselwirkungen zwischen NR und TOR. Aufgrund der DSC-Ergebnisse wurde die Verbesserung der Eigenschaften im CV-System begründet, und es wurde ein wahrscheinlicher Mechanismus für die Änderung der Netzwerk-Struktur vorgeschlagen.
    Notes: A systematic study of filled natural rubber (NR) vulcanizates has been carried out to investigate the effect of a crosslinkable processing aid, trans-polyoctenylene (TOR) on stress-strain properties at high temperature and after ageing. Three different crosslinking systems, i. e., conventional (CV), semi-efficient (SEV) and efficient (EV), are included in this study. Retention of 200% modulus and tensile strength (TS) at high temperature as well as after ageing has been found to be better with TOR in the CV system. TGA results of gum polymeric blends showed enhanced stability with addition of TOR in both oxygen and nitrogen atmosphere. Enhanced thermal stability is also exhibited by higher onset and peak temperature while determining the rescan enthalpy of the filled vulcanized sample by means of DSC. FTIR (ATR) spectra however show no polymeric interaction between NR and TOR. The improvement of properties in the CV system has been explained with the help of DSC results and a probable mechanism has been suggested on the changes of network structure.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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