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  • 1
    Electronic Resource
    Electronic Resource
    Scratch Behaviour of EPR-Rich TPOS (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 557-560 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The scratch behavior of a set of model soft thermoplastic olefin systems containing atleast 65 wt% of ethylene-propylene rubber (EPR) in polypropylene was analyzed using astandardized progressive load scratch test. It was found that raising the ethylene content in the EPRintroduces crystalline phases, as evidenced by differential scanning calorimetry, and significantlyalters the scratch behavior. A strong effect was also observed by changing the rate at which thescratch test was applied. This paper will discuss these effects based on the scratch damagemechanisms observed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.557.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Toughening mechanisms in a multi-phase alloy of nylon 6,6/polyphenylene oxide (1989)
    Springer
    Journal of materials science 24 (1989), S. 1447-1457 
    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 Toughening mechanisms in a nylon 6,6/polyphenylene oxide (PA/PPO) alloy are studied. This alloy consists of well dispersed PPO particles (containing an elastomeric phase) in a PA matrix. Both crazing and shear yielding mechanisms are found to be sequentially operative in this alloy. When a crack propagates in the material, a crazed zone forms ahead of the crack tip. This crazed zone then transforms into a shear yielded zone as the crack propagates through it. The crazes inside the original crazed zone are closed or distorted by the shear yielding process. In the transformed region, the shear yielded material is oriented at different angles as the crack propagates. These findings are consistent with the notion that hydrostatic tension has to be dissipated in order for the remaining deviatoric stress to reach the critical value for yielding. It is possible to partially attribute the increase in toughness to both crack blunting and zone shielding mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397085
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  • 3
    Electronic Resource
    Electronic Resource
    Toughening mechanisms in a multi-phase alloy of nylon 6,6/polyphenylene oxide (1989)
    Springer
    Journal of materials science 24 (1989), S. 1447-1457 
    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 Toughening mechanisms in a nylon 6,6/polyphenylene oxide (PA/PPO) alloy are studied. This alloy consists of well dispersed PPO particles (containing an elastomeric phase) in a PA matrix. Both crazing and shear yielding mechanisms are found to be sequentially operative in this alloy. When a crack propagates in the material, a crazed zone forms ahead of the crack tip. This crazed zone then transforms into a shear yielded zone as the crack propagates through it. The crazes inside the original crazed zone are closed or distorted by the shear yielding process. In the transformed region, the shear yielded material is oriented at different angles as the crack propagates. These findings are consistent with the notion that hydrostatic tension has to be dissipated in order for the remaining deviatoric stress to reach the critical value for yielding. It is possible to partially attribute the increase in toughness to both crack blunting and zone shielding mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553180
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  • 4
    Electronic Resource
    Electronic Resource
    Craze-like damage in a core-shell rubber-modified epoxy system (1992)
    Springer
    Journal of materials science 27 (1992), S. 3098-3107 
    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 Toughening mechanisms of a core-shell rubber-modified epoxy were investigated using various microscopic techniques. It was found that the crack tip damage zone of the rubber-modified epoxy appeared to consist of multiple craze-like damage and massive shear banding using optical microscopy. The craze-like damage was further analysed using transmission electron microscopy (TEM) and actually found to be a collection of line arrays of highly cavitated rubber particles. The matrix material around the cavitated particles appeared to have plastically deformed, while the material outside of the array was undeformed. The structure and physical nature of this highly localized dilatational process are substantially different from those of the commonly known craze. The sequence of events leading to the formation of these craze-like line arrays is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01154125
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  • 5
    Electronic Resource
    Electronic Resource
    Morphology and mechanical property relationship in linear low-density polyethylene blown films (2000)
    Springer
    Journal of materials science 35 (2000), S. 5169-5178 
    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 Linear low-density polyethylene (LLDPE) blown films fabricated under two different processing conditions, namely a non-stalk bubble configuration and a stalk bubble configuration, were investigated. Morphological characterization was performed using small-angle X-ray scattering, transmission electron microscopy, infrared dichroism, and differential scanning calorimetry. The findings on crystal orientation characteristics of the films suggest that modification on the widely accepted row orientation model of Keller and Machin may be needed. In comparison to the conventional non-stalk bubble geometry for LLDPE film blowing, the stalk bubble configuration can produce a more randomly orientated lamellar texture, resulting in less anisotropy in mechanical properties and a higher dart impact resistance. A good correlation between mechanical properties and morphological features was found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004856404439
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  • 6
    Electronic Resource
    Electronic Resource
    Control of Orientation of Lamellar Structure in Linear Low Density Polyethylene Via a Novel Equal Channel Angular Extrusion Process (1998)
    Springer
    Journal of materials science 17 (1998), S. 853-856 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006659127256
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  • 7
    Electronic Resource
    Electronic Resource
    Study of rubber-modified brittle epoxy systems. Part I: Fracture toughness measurements using the double-notch four-point-bend method (1991)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 31 (1991), S. 270-274 
    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: The double-notch four-point-bend (DN-4PB) technique is known to produce fruitful information revealing the toughening mechanisms around the sub-critically propagated crack tip. In this study, correlations among the single-edge-notch three-point-bend (SEN-3PB), the single-edge-notch four-point-bend (SEN-4PB), and the DN-4PB toughness measurement techniques have been conducted using various modified-epoxy systems. The toughnesses of both the neat and rubber-toughened epoxy systems are found to be independent of the testing techniques used. Specifically, when the peak load is plotted against B. W1/2/Y (B: thickness, W : width, and Y: correction factor), the data obtained from SEN-3PB, SEN-4PB, and DN-4PB all fall on the same line. The slope of this line is defined as the stress intensity factor. These results imply that with a single DN-4PB test, it is possible to gain the information needed to describe both the toughening mechanisms and the fracture toughness value of relatively brittle (KIC ≤ 1.2 MPa. M1/2) polymeric materials.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760310410
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  • 8
    Electronic Resource
    Electronic Resource
    Study of rubber-modified brittle epoxy systems. Part II: Toughening mechanisms under mode-I fracture (1991)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 31 (1991), S. 275-288 
    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: The toughening mechanisms in grafted-rubber concentrate (GRC), dispersed acrylic rubber (DAR), and Proteus rubber-modified brittle epoxy (i.e., highly crosslinked) systems are examined using scanning electron microscopy, optical microscopy and transmission electron microscopy techniques. The toughening of the GRC-modified brittle epoxy system is found to be due to cavitation of the GRC rubber particles, followed by formation of limited shear yielding when the crack propagates. Crack bifurcation and crack deflection are also observed in this system. Only crack bifurcation, crack deflection, and possibly crack/particle bridging mechanisms are operative in the DAR-modified brittle epoxy system. In the case of the Proteus rubber-modified system, the rubber appears to be rigid (Tg ≈ 28°C). As a result, the crack/particle bridging mechanism is not observed. Only crack deflection and crack pinning mechanisms are found. These observations are in agreement with the toughness measurement results (see Part I), which indicate that the GRC rubber provides the most effective toughening, followed by the DAR rubber, and then by the Proteus rubber. An approach for toughening brittle epoxies is also discussed.
    Additional Material: 21 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760310411
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  • 9
    facet.materialart.
    Unknown
    Tunable ultraviolet emission of ZnO quantum dots in transparent poly(methyl methacrylate) (2009)
    American Institute of Physics
    Details
    Publication Date: 2009-06-22
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics
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  • 10
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    Unknown
    Influence of humidity on the scratch behavior of polystyrene–acrylonitrile random copolymers (2011)
    Springer
    Details
    Publication Date: 2011-09-01
    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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