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  • 1995-1999  (3)
  • 1996  (3)
  • 1
    Electronic Resource
    Electronic Resource
    A polymer network of unsaturated polyester and bismaleimide resins: Yielding and fracture behaviour (1996)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 241 (1996), S. 11-29 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Das Fließ- und Bruchverhalten eines durch das gleichzeitige Härten eines ungesättigten Polyesters (UP) und eines wärmehärtbaren Bismaleimidharzes (BMI) erhaltenen quervernetzten Polymernetzwerkes wurde über einen weiten Temperatur- und Beanspruchungsbereich untersucht. Die Fließspannung σy und der Youngsche Elastizitätsmodul E steigen bei Zunahme der Spannungsbeanspruchung bzw. bei Absinken der Temperatur. Zudem steigen bei ansonsten gleichen Testbedingungen σy und E mit zunehmendem BMI-Gehalt im Blend. Andererseits wurde eine Beeinflussung des Bruch-Parameters Kc durch die Gegenwart des BMI nicht beobachtet. Der Fließprozess wurde sowohl mit Hilfe der Theorie von Argon als auch mit der von Bowden untersucht; die daraus abgeleiteten Molekül-Parameter wurden mit der bei der Härtung gebildeten Molekularstruktur in Beziehung gesetzt.
    Notes: The yielding and the fracture behaviour of an intercrosslinked polymer network obtained by the simultaneous curing of an unsaturated polyester (UP) and a thermosetting bismaleimide resin (BMI) was investigated in a wide range of temperatures and testing rates. The yield stress σy and the Young's modulus E increase by increasing the testing rate and decreasing temperature. Moreover, under the same testing conditions, σy and E increased as the BMI content in the blend was enhanced. On the other hand, it was found that the fracture parameter Kc was not affected by the presence of BMI. The yielding process was analyzed using the theories both of Argon and Bowden and the molecular parameters derived there were related to the molecular structure of the network developed upon curing.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1996.052410102
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Reactive blending methodologies for biopol (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 39 (1996), S. 191-204 
    Details
    ISSN: 0959-8103
    Keywords: Biopol ; polybutylacrylate ; polycaprolactone ; reactive blending ; melt-mixing ; 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: Multicomponent polymeric systems containing Biopol as one of the phases are described as obtained according to two different procedures: radical polymerization of an acrylic polymer in the presence of Biopol, and melt-mixing of Biopol with polycaprolactone in the presence of peroxide. The decomposition of peroxide causes, in both cases, the formation of intergrafted species responsible for interfacial activity and compatibilization. The results of chemical, chemical-physical, morphological and mechanical tests, confirming the occurrence of such interactions, are reported.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 3
    Electronic Resource
    Electronic Resource
    Upgrading of unsaturated polyesters by reactive blending with bismaleimide resins (1996)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 7 (1996), S. 519-528 
    Details
    ISSN: 1042-7147
    Keywords: Unsaturated polyesters ; bismaleimide resins ; FTIR spectroscopy ; mechanical properties ; 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: An unsaturated polyester resin has been modified by adding a thermosetting bismaleimide (BMI) as second co-reactive monomer. The bismaleimide resin was readily dissolved in the uncured polyester matrix up to a concentration of about 20%. Fourier transform infrared spectroscopy was employed to monitor the cure kinetics of this complex system. The available spectroscopic evidence indicated that both the mechanism and the kinetics of the crosslinking process were strongly affected by the presence of the bismaleimide in the system. The molecular structure of this intercrosslinked network is discussed. The dynamic - mechanical behavior of a typical blend composition was found to be in agreement with the proposed molecular structure. The yield stress and Young's modulus were found to increase by increasing the BMI content in the blend, while the fracture parameter Kc was not affected by the presence of BMI.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
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