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  • 1
    Electronic Resource
    Electronic Resource
    Radiation-induced rejuvenation of poly(methyl methacrylate) (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 3221-3223 
    Details
    ISSN: 0887-624X
    Keywords: poly(methyl methacrylate) ; radiodegradation ; conformations ; rejuvenation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No abstract.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    The change in mechanical behavior of linear polymers during photochemical aging (1981)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 21 (1981), S. 32-38 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: Films of low-density polyethylene, polypropylene, and rigid poly(vinyl chloride) were exposed for 1700 h to artificial aging in a Weather-O-Meter. Photochemical aging was characterized by tensile measurements. We noted that only ultimate properties are affected, whereas properties defined in the low strain range remain unchanged. The kinetics of strain and stress at break depend as much on the polymer's initial rheological characteristics as on the rate of the chemical degradation. The results show that aging results in localized chain breaking leading to defects at the supermolecular level. The average decrease of molecular weight does not seem to influence the mechanical behavior.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760210106
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Skin-core structure-fatigue behavior relationships for injection-molded parts of polypropylene. I. Influence of molecular weight and injection conditions on the morphology (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 34 (1987), S. 1-18 
    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 skin-core structure of various injection-molded samples of PP differing by molecular weight and the injection conditions - essentially injection rate and holding pressure - has been studied by microscopy, DSC, WAXS, and IR dichroïsm on microtome sections. The depth distributions of the degree of crystallinity, macromolecular orientation, and beta phase fraction reveal a complex stratification of the morphology. The importance of the holding pressure and its delay of application after the mold filling are underlined.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1987.070340101
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  • 4
    Electronic Resource
    Electronic Resource
    Skin-core structure-fatigue behavior relationships for injection-molded parts of polypropylene. II. Morphology-fatigue behavior relationships (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 34 (1987), S. 19-36 
    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 flexural fatigue properties were studied for PP injection-molded samples of different molecular weight and well-defined skin-core morphology (see Part I). It can be clearly seen that the crack initiation always occurs in the subskin layer of higher macromolecular orientation, and propagates towards the core. The mechanisms of cracking are discussed on the basis of fatigue kinetic data and analytical measurements on the stressed sections. The important influence of processing conditions, essentially holding pressure on the fatigue behavior is illustrated.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1987.070340102
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Prediction of the glass transition temperature of cycloaliphatic amine-epoxy networks (1991)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 29 (1991), S. 981-987 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Stoichiometric, completely cured binary or ternary mixtures of the diglycidylether of bisphenol A (DGEBA), isophorone diamine (IPD), and trimethylcyclohexylamine (TMCA) monomers were studied by differential scanning calorimetry. The relations between the glass transition temperature Tg and the structure of the copolymer networks were investigated. Good predictions of Tg can be obtained on the basis of the following hypothesis: (1) the molar contributions MiT-1gi to the “copolymer effect” of difunctional groups are additive, (2) the crosslinking effect can be expressed by the DiMarzio relation in which the molar contribution of crosslink mers is an increasing function of the stiffness of linear segments. For the seven systems under study, the deviation between calculated and experimental Tg values is within experimental scatter.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1991.090290808
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Irreversibility of structural changes induced by stretching in poly(vinyl chloride) (1996)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 197 (1996), S. 991-1005 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: It has been shown that certain structural (X-ray diffraction) and physical (infrared dichroïsm, α-relaxation dynamics) characteristics of poly(vinyl chloride) undergo irreversible changes upon sample drawing. This behaviour reveals some non-equilibrium character of the polymer, even in tetrahydrofuran (THF) solution or in the rubbery state (at, typically, glass transition temperature Tg + 10°C). Two tentative ways of explanation have been proposed. The first one would attribute the cause of this peculiar behaviour to physical crosslinks linked to strong interchain bonding. These bonds would resist to dissolution in THF at room temperature but would be broken during stretching. The second way of explanation involves the presence of a metastable GTTG-TT conformation at the end of an isotactic sequence in an mmr chain segment. Like the above mentioned physical crosslinks, it would be transformed upon mechanical loading but not during dissolution in THF or heating to 90°C. Both hypotheses are not necessarily incompatible: as a matter of fact, GTTG- conformations at the end of the isotactic triads could represent sites of especially high intermolecular interaction, distributed along the polymeric chain.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1996.021970319
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