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  • 1
    Electronic Resource
    Electronic Resource
    Mechanical properties of thermoplastic elastomers of poly(butylene terephthalate) and poly(ethylene glycol) in a bending deformation (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 51 (1994), S. 145-151 
    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: Thermoplastic elastomers based on poly(butylene terephthalate) (PBT) and poly(ethylene glycol) (PEG) were studied by bending-creep measurements. The dependence of the creep compliance on the composition of the block copolymer was determined, and the experimental results were compared with calculated results to obtain a better understanding of structure-property relationships for this class of materials. The hard PBT domains in the rubbery PEG matrix make a large contribution to the mechanical strength and hardness, presumably serving as reinforcing fillers as well as cross-links. Relaxation effects were found to decrease significantly with increase in hard-segment content. © 1994 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070510115
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Stress relaxation in stretched networks immersed in solvent (1990)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 28 (1990), S. 1781-1790 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Stress relaxation in swollen polybutadiene networks is studied. The networks, which are immersed in solvent at equilibrium, are uniaxially stretched suddenly and the relaxation of the force required to keep them at constant length is monitored. The observed relaxation is predominantly due to the diffusion of solvent into the stretched networks. Measurements are made at different extensions and temperatures. The degree of swelling of the networks is calculated as a function of the observed force by adopting the phantom network model of rubber elasticity. The relationship between the diffusion of solvent into the networks and stress relaxation is given. The variation of the degree of swelling with time is used to calculate the coefficients of diffusion for n-hexane and dodecane in polybutadiene.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1990.090281010
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Moduli of model elastomeric networks prepared from polymer chains having a high plateau modulus, and their interpretation in terms of the constrained-chain model (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 31 (1993), S. 481-486 
    Details
    ISSN: 0887-6266
    Keywords: networks, interpretation of elastic moduli of ; chain entanglements and theory of rubberlike elasticity ; polybutadiene in crosslinked networks, theory of elasticity of ; stress-strain relationship in networks of high plateau modulus polybutadiene ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: High-molecular weight polybutadiene chains having approximately 47% cis-1,4 units and 45% trans-1,4 units were crosslinked through their carbon-carbon double bonds using p-bis(dimethylsilyl) benzene as crosslinking agent and chloroplatinic acid as catalyst. This particular polymer was chosen because the high plateau modulus it exhibits in the un-crosslinked state is taken to indicate large numbers of chain entanglements, and stress-strain measurements on such networks have frequently been interpreted with the assumption that the trapping of such entanglements during crosslinking should contribute significantly to their modull. It is shown in the present investigation that such results are equally well interpreted in terms of the new constrained-chain theory of rubbery elasticity. © 1993 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1993.090310414
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    Paper (German National Licenses)
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