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  • 1
    Electronic Resource
    Electronic Resource
    Interpenetrating polymer networks of polyurethanes and epoxy resin, I. Mechanical behavior (1991)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 193 (1991), S. 89-98 
    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: Interpenetrierende Netzwerke (IPN) aus Polyurethanen (PU) und dem Glycidylether eines Phenol-Formaldehyd-Kondensates (GEPF) wurden durch gleichzeitige Polymerisation („Cokondensation“) hergestellt. Der Einfluß des PU-Molekulargewichts und -Gehalts auf die mechanischen Eigenschaften wird diskutiert. Bei PU/GEPF IPN aus Polyester-Typ-PU nahmen mit steigendem PU-Gehalt sowohl die Zugfestigkeit als auch die Bruchenergie ab, während die Schlagfestigkeit signifikant anstieg. Demgegenüber zeigten PU/GEPF IPN aus Polyether-Typ-PU eine sinkende Heterogenität mit abnehmendem Molekulargewicht der Polyetherpolyol-Komponente im PU und dementsprechend eine Zunahme sowohl der Zugfestigkeit als auch der Bruchenergie. Die Schlagfestigkeit zeigte dagegen mit steigendem PU-Gehalt zunächst einen Anstieg zu einem Maximalwert, um dann wieder abzufallen.
    Notes: The interpenetrating polymer networks (IPNs) prepared from polyurethane (PU) and a glycidyl ether of phenol formaldehyde (GEPF) were synthesized by using a simultaneous polymerization method. The effects of PU molecular weight and amount on the mechanical property are discussed. For the PU/GEPF IPNs based on polyester-type PU, as the PU content was increased, the tensile strength and fracture energy decreased, but the impact strength increased significantly. However, for the PU/GEPF IPNs based on polyether-type PU, the extent of heterogeneity was decreased with decreasing molecular weight of polyether polyol in PU and the tensile strength and fracture energy were enhanced. The impact strength increased to a maximum value and then decreased when the PU content was further increased.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1991.051930109
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  • 2
    Electronic Resource
    Electronic Resource
    Interpenetrating polymer networks of polyurethanes and epoxy resin, II. Compatibility and morphologyPart I cf.10. (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 194 (1992), S. 15-22 
    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: Interpenetrierende Netzwerke (IPN) aus Polyurethanen (PU) und dem Glycidylether eines Phenol-Formaldehyd-Kondensates (GEPF) wurden durch gleichzeitige Polymerisation („Cokondensation“) hergestellt. Die dynamisch-mechanischen Eigenschaften und die Morphologie dieser IPN wurden untersucht. Dabei zeigte sich, daß PU/GEPF IPN eine Mehrphasen-Morphologie aufweisen. Mit PU sowohl auf Polyesterpolyol- als auch auf Polyetherpolyol-Basis zeigten die dynamisch-mechanischen Analysen (DMA) verschiedene Verschiebungen der Verlustmoduli (E″) der Hoch- und Niedertemperaturübergangsbereiche in Abhängigkeit von Typ und Molekulargewicht der im PU verwendeten Polyol-Komponente. Drei verschiedene übergangsbereiche konnten bis zu einem bestimmten PU-Gehalt beobachtet werden.
    Notes: The interpenetrating polymer networks (IPN) of polyurethanes (PU) and a glycidyl ether of phenol formaldehyde (GEPF) were prepared by a simultaneous polymerization method. The dynamic mechanical properties and morphologies of the IPNs were investigated. It was found that multiphased morphology was formed in the PU/GEPF IPNs. With the PU based on polyester- or polyether-type polyols, the dynamic mechanical analysis (DMA) of these IPNs exhibited various shifts in the loss moduli (E″) of the high and low temperature transition domains depending upon the types and molecular weights of the polyols employed in the PU. Three distinct transition domains were observed as the PU content increased up to a certain level.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051940102
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  • 3
    Electronic Resource
    Electronic Resource
    Interpenetrating polymer networks of polyurethane and maleimide-terminated polyurethane for biomedical applications (1996)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 7 (1996), S. 265-272 
    Details
    ISSN: 1042-7147
    Keywords: polyurethane ; bismaleimide ; biomaterial ; blood compatibility ; surface property ; mechanical property ; degree of compatibility ; 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: Interpenetrating polymer networks (IPNs) of polyurethane (PU) and maleimide-terminated polyurethane (UBMI) were prepared by using a simultaneous polymerization technique. The effects of the UBMI molecular weight and amounts of the UBMI in the IPNs on the mechanical properties, dynamic mechanical properties, degree of compatibility, water absorption, surface properties and dynamic thrombosis were investigated. Bulk structure and surface properties were analyzed in order to correlate their blood compatibility. The IPNs exhibited a higher ultimate tensile strength especially when the UBMI with short soft chains was introduced. The heterogeneous characteristics were found for the IPNs when longer soft segment chains were incorporated in the PU component polymer. The presence of hydrophilic/hydrophobic alternative microdomains on the IPN surface was proposed to be the reason for good blood compatibility. The degree of compatibility, compositions of each domain and content of each domain in the matrix were calculated and correlated with the blood compatibility.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Kinetics of curing reaction of epoxide catalyzed by tertiary amine (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 50 (1993), S. 1099-1106 
    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 kinetic study of the curing reaction of epoxide catalyzed by tertiary amine was carried out through thermal analysis of the reaction by differential scanning calorimetry (DSC). Using infrared spectroscopy (IR) and neutron magnetic reasonance (NMR) analysis, a reaction mechanism for this reaction was proposed. The reaction proceeded to anionic polymerization. An autocatalytic reaction was induced at high concentration of the tertiary amine catalyst. © 1993 John Wiley & Sons, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070500618
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  • 5
    Electronic Resource
    Electronic Resource
    The molecular orientation and mechanical properties of poly(ethylene terephthalate) under uniaxial extension (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 50 (1993), S. 855-862 
    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 molecular orientation, induced crystallization, and mechanical properties of amorphous poly(ethylene terephthalate) (PET), stretched at different temperatures and strain rates, were studied. The results indicate that the orientation parameter [P2(cosθ)] of oriented PET varies strongly with both temperature and strain rate, but the strain-induced crystallinity seems dependent on temperature only. It was also found that as draw ratio increased, the Young's modulus, yield stress, and necking ratio were greatly improved in the stretching direction, but slightly declined in the transverse direction. A rubber network model was used to make a quantitative description of the orientation development with draw ratio. © 1993 John Wiley & Sons, Inc.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070500513
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