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  • 1
    Electronic Resource
    Electronic Resource
    Effect of dihydroxydiphenyl ether on poly(ether ether ketone) (1996)
    Springer
    Journal of polymer research 3 (1996), S. 83-88 
    Details
    ISSN: 1572-8935
    Keywords: Poly(ether ether ketone) ; Poly(ether ether ether ketone)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A series of modified poly(ether ether ketone) (PEEK) polymers were synthesized by introduction of addition ether groups from dihydroxydiphenyl ether (DHDE) into the PEEK structure. The inherent viscosity of the DHDE-modified PEEK increased with reaction time at 320 °C. DSC thermograms showed the melting points of the obtained PEEK decreased with the increase of the DHDE content in the backbone. The degradation temperature (Td) was slightly decreased by the introduction of DHDE. The crystallinity as measured via the X-ray diffraction (XRD) increases with the introduction of DHDE into the modified PEEK. The crystalline structure was identified as an orthorhombic structure with lattice constants a = 7.72 Å, b = 5.86 Å, and c = 10.24 Å. Due to the glass transition temperature (Tg) and the melting temperature (Tm) decreasing with the increase of the DHDE content in the reaction system. the processability of the resultant PEEK could be improved through this DHDE modification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01492898
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  • 2
    Electronic Resource
    Electronic Resource
    Interpenetrating polymer networks of polyurethane and epoxy (1994)
    Springer
    Journal of materials science 29 (1994), S. 5435-5440 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Interpenetrating polymer networks of polyurethane, based on poly(oxypropylene)triol grafted with polyacrylonitrile and epoxy, were prepared by a simultaneous polymerization technique. The mechanical properties and morphology of the networks were investigated. As the epoxy content increased, the tensile strength of the interpenetrating polymer networks or the graft networks (in which some grafting reaction has taken place between polyurethane and the pendant hydroxyl group of epoxy) decreased. The shifts of the loss modulus peaks of the interpenetrating polymer networks and the graft-IPNs were different and their tan δ peaks shifted to a high temperature as the epoxy content increased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01171558
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  • 3
    Electronic Resource
    Electronic Resource
    Interpenetrating polymer networks of polyurethane cross-linked epoxy and polyurethanes (1997)
    Springer
    Journal of materials science 32 (1997), S. 3503-3509 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Interpenetrating polymer networks (IPNs) were prepared from polyurethane (PU) cross-linked epoxy and polyurethanes based on the mixture of polydiol and polytriol by the one-shot method. The mechanical properties, dynamic mechanical properties, morphology and damping behaviour were investigated. The results show that the damping ability and mechanical strength are enhanced through the introduction of PU cross-linked epoxy into the PU matrix to form the IPN structure. As the epoxy content increases, the tensile strength of the two types of the IPNs decrease in low composition, then increase in high composition. The damping properties of the PU (polyether type) cross-linked epoxy/PU IPNs are much better than those of the PU (polyester type) cross-linked epoxy/PU IPNs, but the mechanical properties reveal an opposite tendency. The sample with 20 wt% epoxy content in the PU cross-linked epoxy/PU IPNs shows particle–matrix morphology and exhibits good damping properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018645405853
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  • 4
    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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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Swelling equilibrium and sorption kinetics of urethane-modified bismaleimides elastomer (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 35 (1997), S. 1747-1755 
    Details
    ISSN: 0887-6266
    Keywords: polyurethane ; bismaleimide ; swelling ; equilibrium ; swelling kinetics ; functionality ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The swelling equilibrium and diffusion kinetics in various solvents of the maleimide-terminated polyurethanes (UBMIs) and of the triol and tetraol-crosslinked polyurethanes (PU) were studied. The polymer volume fraction of the UBMIs at swelling equilibrium is much higher than that of the tetraol-crosslinked PU networks for the same type of polyol used in the PU. It was explained by the high functionality of the UBMIs produced in the network structure. Furthermore, the molecular weight between crosslinks (Mc) has been calculated from the swelling model and the results exhibit good agreement with the proposed network structure. The early time sorption kinetic data were obtained to investigate the diffusion mechanism of the solvent in the networks. The solubility, diffusion coefficients, and permeability of the solvent in UBMI networks were found to be lower than in the multiol-crosslinked PU networks. © 1997 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 35: 1747-1755, 1997
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 7
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    Unknown
    Interpenetrating polymer networks of polyurethane and epoxy (1994)
    Springer
    Details
    Publication Date: 1994-01-01
    Print ISSN: 0022-2461
    Electronic ISSN: 1573-4803
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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