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  • 1
    Electronic Resource
    Electronic Resource
    Mass spectral and pyrolysis/gas-chromatographic studies of the monomer and polymer of bis(p-toluenesulfonate) of 2,4-hexadiyne-1,6-diol (1977)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 15 (1977), S. 1155-1167 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The thermal degradation of the monomer and polymer of bis(p-toluenesulfonate) of 2,4-hexadiyne-1,6-diol has been investigated. Decomposition during the latter stages of solid-state thermal polymerization at 80°C and of 100% polymer at 112°C was observed by mass spectrometry and the decomposition fragments identified. Mechanisms for this low-temperature degradation are suggested. Pyrolysis of the monomer and polymer between 400 and 1000°C was studied by gas chromatography and mass spectrometry. The principal pyrolysis products are triacetylene and p-toluenesulfonic acid. The fragmentation routes leading to and derived from these products are discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1977.170150513
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  • 2
    Electronic Resource
    Electronic Resource
    Vinyl-terminated oligomeric ethers: A study of the crosslinking process (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 42 (1991), S. 35-43 
    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: A thermosetting resin consisting of a mixture of vinyl-terminated oligomeric ethers was prepared by a two-step synthesis. This required the reaction of 1,4-bis (chloromethyl) benzene with the potassium salt of bisphenol A, and subsequent vinylation of the chloromethyl end groups by means of a Wittig reaction. The linear vinyl prepolymers were thermally crosslinked through their reactive styryl end groups (without the addition of catalyst) to produce castings and woven glass laminates. A study of the crosslinking process was carried out by differential scanning calorimetry (DSC). The water absorption and the thermooxidative stability of the crosslinked polymer were investigated. A styrene solution of the oligomeric ethers was also crosslinked, using benzoyl peroxide as a catalyst. The moisture absorption characteristics of the crosslinked styrene copolymer were compared with those of the crosslinked homopolymer. Both substances showed hydrophobic character.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070420105
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  • 3
    Electronic Resource
    Electronic Resource
    Measuring and reducing moisture penetration through thick laminates (1996)
    Hoboken, NJ : Wiley-Blackwell
    Advances in Polymer Technology 15 (1996), S. 223-235 
    Details
    ISSN: 0730-6679
    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
    Notes: Moisture transmission can be a factor in the selection of materials for load-bearing structural composites. This article considers the methods currently available for measuring the permeability to moisture of membranes, and their applicability to thick laminates. It summarizes the experimental results available in the literature, and discusses the available means of reducing moisture permeability without resorting to metallic barrier films. New experimental results are presented, comparing the three main categories of thermosetting laminating resins (epoxy, polyester, and vinyl ester) and two moisture barrier coatings. The vinyl ester resin showed the lowest permeability. Both barrier coatings reduced the water transmission rates, although their robustness and long-term adhesion to the substrates have yet to be evaluated. © 1996 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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