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  • 1
    Electronic Resource
    Electronic Resource
    Crystallization of Vulcanized Rubber (1941)
    s.l. : American Chemical Society
    Industrial & engineering chemistry 33 (1941), S. 381-384 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie50375a023
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  • 2
    Electronic Resource
    Electronic Resource
    Density Measurements on Synthetic Rubbers (1942)
    s.l. : American Chemical Society
    Industrial & engineering chemistry 34 (1942), S. 1291-1293 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie50395a008
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Creep and other tensile properties of rubber cross-linked by dicumyl peroxide (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 10 (1972), S. 43-50 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Natural rubber crosslinked by dicumyl peroxide in amounts up to 25 parts per hundred of rubber (phr) showed a maximum in tensile strength near 1 phr, followed by a steep decrease to a minimum near 5 phr. The ultimate elongation decreased from 870% at 0.5 phr. to about 10% above 10 phr. The modulus increased linearly with increase of crosslinking. The creep rate decreased from 5.6% per decade at 0.5 phr to zero at 5 phr and higher values. Crystallization, with a resultant abrupt increase in creep, was noted in specimens held in the stretched condition for more than one day. Between 5 and 25 phr this system (when crystallization is avoided) appears to function as an ideal elastic network and can be recommended for studies of rubber elasticity since no variation of modulus with time is observed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1972.160100104
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  • 4
    Electronic Resource
    Electronic Resource
    Ethylene-propylene copolymers: Crystallinity, infrared, and creep studies (1964)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 8 (1964), S. 2645-2651 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Density, infrared, and creep studies have been made of ethylene-propylene copolymers containing up to about 50 mole-% propylene and their homopolymers. The degree of crystallinity (volume fraction of polyethylene crystals), as measured by density and x-ray studies, decreases with increased propylene content. This change is also reflected in the intensity of the 13.7 μ band in the infrared spectra of the polymers. The measured amount of unsaturation (0.1-0.2%) in the copolymers is too small to account for the presence of several infrared bands which are often attributed to unsaturation. An unsaturation of 0.90% was obtained for a terpolymer where the third component was unsaturated. Indentation-creep studies showed the creep to be nearly proportional to the logarithm of time with a slope of 10% creep per decade for 0.1-10 min. Compliance-temperature graphs were found to be quite similar to those for the styrene-butadiene rubber SBR 1500.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1964.070080612
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  • 5
    Electronic Resource
    Electronic Resource
    Glass transition temperatures of copolymers (1958)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 28 (1958), S. 319-330 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Gordon-Taylor equation relating the glass transition temperature θ of a copolymer to the glass transition temperatures θ1 and θ2 of the homopolymers is equivalent to \documentclass{article}\pagestyle{empty}\begin{document}$$A_1 c_1 (\theta - \theta _1 ) + A_2 c_2 (\theta - \theta _2 ) = 0 $$\end{document} where c1 and c2 are the weight fractions of the constituents and A1 and A2 are constants. It can be recast into the following forms suitable for linear plots \documentclass{article}\pagestyle{empty}\begin{document}$ \theta = k\left( {\theta _2 - \theta } \right)\left( {{{c_2 } \mathord{\left/ {\vphantom {{c_2 } {c_1 }}} \right. \kern-\nulldelimiterspace} {c_1 }}} \right) + \theta _1 $\end{document} and \documentclass{article}\pagestyle{empty}\begin{document}$ \theta = - \left( {{1 \mathord{\left/ {\vphantom {1 k}} \right. \kern-\nulldelimiterspace} k}} \right)\left( {\theta - \theta _1 } \right)\left( {{{c_1 } \mathord{\left/ {\vphantom {{c_1 } {c_2 }}} \right. \kern-\nulldelimiterspace} {c_2 }}} \right) + \theta _2 $\end{document} where k = A2/A1. Data from the literature on 10 copolymer systems, including butaciene-styrene copolymers, give linear plots, verifying the equation within experimental error. However, the observed value of k is in most cases significantly smaller than the ratio of the differences of the volume-temperature coefficients for each homopolymer in the rubbery and glassy states, as required by the derivation of Gordon and Taylor. The glass transition temperature (in °C.) for a butadiene-styrene copolymer prepared by emulsion polymerization at 50°C. may be calculated from the weight fraction c2 of bound styrene as \documentclass{article}\pagestyle{empty}\begin{document}$ \theta = {{\left( { - 85 + 135c_2 } \right)} \mathord{\left/ {\vphantom {{\left( { - 85 + 135c_2 } \right)} {\left( {1 - 0.5c_2 } \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 - 0.5c_2 } \right)}} $\end{document} and for a similar 5° copolymer as \documentclass{article}\pagestyle{empty}\begin{document}$ \theta = {{\left( { - 78 + 128c_2 } \right)} \mathord{\left/ {\vphantom {{\left( { - 78 + 128c_2 } \right)} {\left( {1 - 0.5c_2 } \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 - 0.5c_2 } \right)}} $\end{document}
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1958.1202811707
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  • 6
    Electronic Resource
    Electronic Resource
    Utility of the tait equation relating volume and pressure in the study of transitions in polymers (1964)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 2 (1964), S. 703-707 
    Details
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1964.110020710
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