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  • 1
    Electronic Resource
    Electronic Resource
    Depression of glass transition temperatures of polymer networks by diluents (1983)
    s.l. : American Chemical Society
    Macromolecules 16 (1983), S. 244-249 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00236a017
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  • 2
    Electronic Resource
    Electronic Resource
    Nature of the water-epoxy interaction (1985)
    s.l. : American Chemical Society
    Macromolecules 18 (1985), S. 1091-1095 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00148a008
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  • 3
    Electronic Resource
    Electronic Resource
    Mortlakes as a Cause of River-windings. (1920)
    [s.l.] : Nature Publishing Group
    Nature 105 (1920), S. 264-265 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] MORTLAKE on the Thames has a place-name which not only accords with the natural history of the place, but also supplies a word which might conveniently be brought into common use to signify a process which plays an important part in the development of every river system, just as the River ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/105264b0
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal degradation of polymers. XXIII. Vacuum pyrolysis of poly(p-N,N-diethylaminostyrene); the products volatile at pyrolysis temperature, liquid or gaseous at room temperature (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 23 (1979), S. 2871-2880 
    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: The products obtained on vacuum pyrolysis of poly(p-N,N-diethylaminostyrene) are described. The effect of sample molecular weight and pyrolysis temperature are compared with that observed for polystyrene degraded under identical conditions. The liquid products were separated using gas-liquid chromatography and identified using Kovat's retention index and mass spectrometry. Significant differences were found between the products arising from the two polymers which are discussed in terms of mechanisms involving N-alkyl and N-aryl bond scission and the subsequent reactions of the generated radicals. Comparative quantitative studies are described and discussed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1979.070231004
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  • 5
    Electronic Resource
    Electronic Resource
    Moisture-induced plasticization of amorphous polyamides and their blends (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 36 (1988), S. 451-466 
    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: The moisture-induced plasticization of some amorphous polyamides in pure and blended form has been determined by calorimetric methods. The compositional dependence of the glass transition temperature of these polymer-diluent systems has been adequately accounted for using an existing predictive expression derived from both a conformational entropy and a thermodynamic treatment of the glass transition phenomenon. The success of this approach to account for the behavior of amorphous polyamide blends containing hydrophobic and hydrophilic constituents exemplifies the importance of compositional parameters in determining the overall response of morphologically complex hydrophilic polymers. The results add further credence to the simple plasticizing action of water in polar polymers irrespective of their chemical and physical constitution.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1988.070360301
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  • 6
    Electronic Resource
    Electronic Resource
    Thermal degradation of polymers. XXI. Vacuum pyrolysis of poly(m-N,N-dimethylaminostyrene); the products volatile at pyrolysis temperature, liquid at room temperature (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 23 (1979), S. 2837-2854 
    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: The products obtained on degradation of poly(m-N,N-dimethylaminostyrene) in vacuo are described. The effects of molecular weight and pyrolysis temperature are discussed and compared with those observed for polystyrene under similar conditions. The liquid products of pyrolysis were separated and identified by gas-liquid chromatography using Kovats' retention index and by mass spectrometry. Product analysis revealed significant differences between the products of degradation of the two polymers, and mechanisms involving N-alkyl and N-aryl bond scission are proposed and discussed to account for this behavior. The degradation behavior of poly(m-N,N-dimethylaminostyrene) shows a marked molecular weight dependence. This is discussed in terms of the differences in the physical forms of the polymer produced on heating, namely, formation of a “melt” or retention of the original “fibrous” identity. Quantitative studies on the liquid fraction are also described and the behavior compared with results obtained on polystyrene.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1979.070231002
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  • 7
    Electronic Resource
    Electronic Resource
    Thermal degradation of polymers. XXIV. Vacuum pyrolysis of poly(p-N,N-diethylaminostyrene); the residue and the fraction volatile at pyrolysis temperature, involatile at room temperature (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 23 (1979), S. 2881-2892 
    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: Comparative studies were made of the residue and the fraction volatile at pyrolysis temperature, involatile at ambient temperature obtained from polystyrene and poly(p-N,N-diethylaminostyrene) degraded under identical conditions. Poly(p-N,N-diethylaminostyrene) yielded a crosslinked glassy residue after pyrolysis at temperatures greater than 250°C, and crosslinking is accompanied by N-alkyl group scission as shown by mass spectrometry. The components of the fraction volatile at pyrolysis temperature, involatile at ambient temperature were separated and identified by GPC and mass spectrometry. Mechanisms involving N-alkyl and N-aryl bond scission are proposed to account for the observed products. Quantitative studies on the effect of pyrolysis temperature and polymer molecular weight on the residue and the volatile fraction are described and discussed. No molecular weight dependence was observed for this system in the range studied.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1979.070231005
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  • 8
    Electronic Resource
    Electronic Resource
    Thermal degradation of polymers. XXII. Vacuum pyrolysis of poly(m-N,N-dimethylaminostyrene); the residue and the fraction volatile at pyrolysis temperature, involatile at room temperature (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 23 (1979), S. 2855-2869 
    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: The effect of extent of degradation of poly(m-N,N-dimethylaminostyrene) on the quantity and molecular weight of the residue is described. Comparative studies on polystyrene and poly(m-N,N-dimethylaminostyrene) have indicated significant differences between the two polymers. Torsional braid analysis has shown the crosslinked residue from poly(m-N,N-dimethylaminostyrene), produced at temperatures greater than 150°C, to be obtained on the heating cycle rather than the cooling cycle, and mechanisms to account for this phenomenon are discussed. The physical form of the residue has been found to be molecular weight dependent, and this has been discussed in terms of the differences in “melt temperature” relative to the “onset temperature” for crosslinking. The quantity and composition of the fraction volatile at pyrolysis temperature, involatile at ambient temperature are discussed. The components of this fraction were identified by GPC and mass spectrometry and include oligomers containing the secondary amino function. Mechanisms involving N-alkyl and N-aryl scission are proposed to account for the observed products.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1979.070231003
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  • 9
    Electronic Resource
    Electronic Resource
    The influence of thermal properties on the glass transition temperature in styrene/divinylbenzene network-diluent systems (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 28 (1983), S. 23-32 
    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: The depression of glass transition temperature in polystyrene and styrene/divinylbenzene networks, by the addition of ethylbenzene, ethyl acetate, and m-diethylbenzene, respectively, has been investigated by differential scanning calorimetry. The predictive quality of the Couchman-Karasz treatment for the composition dependence of Tg in compatible systems was found to provide excellent agreement with experimental results for the depression of Tg by ethylbenzene, provided certain modifications were made. Qualitatively, the theory predicts that for a given diluent, the depression of Tg is particularly sensitive to the incremental change in heat capacity of the pure polymer or network. The behavior of ethylbenzene provided good quantitative agreement with the theory, provided that the incremental change in heat capacity of the diluent at its Tg was approximated by ΔCp = constant/T and that the incremental change in heat capacity of the network at Tg represents only those units capable of thermal activation. The anomalous behavior observed on plasticization by ethyl acetate and m-diethylbenzene could in part be explained by a reduction in solvent quality or syneresis of diluent in the highly crosslinked samples.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1983.070280103
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  • 10
    Electronic Resource
    Electronic Resource
    The effect of crystallinity and crosslinking on the depression of the glass transition temperature in nylon 6 by water (1984)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 22 (1984), S. 1701-1717 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The influence of crystallinity and crosslinking on the depression of the glass transition temperature in nylon 6 by water has been investigated by dynamic mechanical methods. Radiation crosslinking by high-energy electrons was effective in preventing morphological changes during the measurement of the incremental change in heat capacity (ΔCp) at Tg, which was performed by differential scanning calorimetry. The experimentally determined value of ΔCp, when normalized to account for the crystalline phase, was found to deviate from a linear two-phase relation and was reduced further than would be expected based on this model. It is proposed that nylon 6 is best described by a three-phase model which consists of a crystalline domain, a wholly amorphous domain, and an “intercrystalline” region. The importance of this in explaining the relatively large depression of Tg by small quantities of water is illustrated by applying equations derived to account for the compositional dependence of Tg in polymerdiluent mixtures, based on a classical thermodynamic interpretation of the glass transition phenomenon.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1984.180221001
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