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  • 1980-1984  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Chemical modification of polydienes, 2Part 1: cf.1. Properties of polybutadiene and nitrile rubbers grafted with poly(tetrahydrofuran) (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 1645-1651 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Thermal analysis by differential scanning calorimetry (DSC) indicated that graft copolymers of poly(tetrahydrofuran) (PTHF) on a nitrile rubber containing 39 wt.-% acrylonitrile have a two-phase morphology comprising crystalline PTHF and amorphous rubber. In rubbers with an 18 wt.-% acrylonitrile content the PTHF is more compatible with the rubber and exerts a plasticising effect; crystallinity of the PTHF is not as well developed. cis-1,4-Polybutadiene and PTHF are partially miscible and in grafts on these two the melting endotherm of the latter was not detected. The relative values of the solubility parameters of PTHF and the three rubbers are consistent with this behaviour. All graft copolymers have a fairly low thermal stability and begin to decompose under N2 below 200°C. Degradation appears to be initiated at the PTHF grafts. Graft copolymers of PTHF with nitrile rubbers are less resistant to petroleum than the ungrafted rubbers.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1983.021840810
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Chemical modification of polydienes, 1. Grafting of chlorohydrinated polybutadiene and nitrile rubbers with poly(tetrahydrofuran) (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 1153-1161 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: cis-1,4-Polybutadiene and nitrile rubbers were functionalised with chlorohydrin groups up to levels of 10 mol-% in a two-stage process. In the first stage epoxide groups were introduced by reaction of the rubber with m-chloroperbenzoic acid and in the second stage the epoxide ring was opened by reaction with hydrochloric acid to yield chlorohydrin groups. Both steps in the process are clean and virtually quantitative. Graft chains of poly(tetrahydrofuran) were introduced by coupling the hydroxyl groups with living poly(tetrahydrofuran) cations. The lengths of the graft chains were determined by the time between initiation (by the action of silver perchlorate on ethyl bromide in tetrahydrofuran solution) and the coupling step with the functionalised rubber.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1983.021840604
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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