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  • 1
    Electronic Resource
    Electronic Resource
    Carbon-13 nuclear Overhauser effects and molecular motion in bulk elastomers (1989)
    s.l. : American Chemical Society
    Macromolecules 22 (1989), S. 1307-1316 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00193a051
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  • 2
    Electronic Resource
    Electronic Resource
    Motional perturbation at the microphase boundary in thermoplastic elastomers (1990)
    s.l. : American Chemical Society
    Macromolecules 23 (1990), S. 4658-4670 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00223a026
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  • 3
    Electronic Resource
    Electronic Resource
    NMR Investigation of the Order-Disorder and Rheological Transitions in Styrene-Isoprene Diblock Copolymers (1994)
    s.l. : American Chemical Society
    Macromolecules 27 (1994), S. 1493-1499 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00084a034
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  • 4
    Electronic Resource
    Electronic Resource
    Etude des composés à chaînes aliphatiques. I. Synthèse et caractérisation cristallographique des bis(n-alcanoates) de pipérazinium, 2[CxH2x−1O2−].[C4H12N22+] (1982)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 15 (1982), S. 279-281 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Crystal data for the series of piperazinium bis(n-alkanoates) of the type 2[CxH2x − 1O2−] [C4H12N22+] for x = 1 to 16 are presented. Most of these compounds have triclinic unit cells whose dimensions, obtained from single-crystal work, have been used to index their powder diagrams. The a ({\bar a} = 5.718 Å) and b ({\bar b} = 7.481 Å) cell dimensions remain nearly constant while the c dimension and the volume of the unit cell increase linearly with x, the number of carbon atoms in the alkanoate anion. Presumably the aliphatic sequence in the alkanoate anion adopts the fully extended conformation and lies in the bc plane and nearly along the c direction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889882011996
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  • 5
    Electronic Resource
    Electronic Resource
    Consolidation Process of PEEK/Carbon Composite for Aerospace Applications (1998)
    Springer
    Advanced performance materials 5 (1998), S. 83-96 
    Details
    ISSN: 1572-8765
    Keywords: degradation ; mechanical properties ; microstructure ; PEEK/carbon ; processing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Processing of PEEK/carbon composites into an aerospace structural part like the space arm can be very complex and necessitates repetition of the consolidation process in order to obtain a void free structure. The objective of the present work was to evaluate the effect of successive consolidations on the PEEK/carbon composite properties in order to determine optimum consolidation conditions. It is well known that the properties of the PEEK matrix in PEEK/carbon fiber composite are dependent on the processing conditions. Since each of the successive consolidations is done at a temperature of 400°C for a period of 60 minutes, it can be predicted that after a few cycles of consolidation, such thermal treatment can lead to matrix modifications. The results of the present study indicate that successive consolidations lead to modifications of the crystallization behavior of the PEEK matrix in the composite; alteration of the mechanism of nucleation of the PEEK matrix as well as the global rate of crystallization and a reduction in the recrystallizable material was observed. Modifications in the crystallization behavior of the PEEK matrix probably result from alteration of the chemical structure of the PEEK matrix when the composite is submitted to long treatment at high temperature. In particular, under oxidizing conditions, in air for example, chain scission followed by crosslinking reactions was proposed as the mechanism responsible for the matrix evolution. The evaluation of the tensile properties and the short beam shear strength of the consolidated samples also suggests that successive consolidations can affect the mechanical behavior of the PEEK/carbon composites. The mechanical characterization indicates that up to a certain level, the evolution of the PEEK structure during the consolidation process can be beneficial in terms of tensile and interfacial performance since crosslinks are strengthening structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008638105370
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  • 6
    Electronic Resource
    Electronic Resource
    Fatigue propagation behaviour of polystyrene/polyethylene blends (1998)
    Springer
    Journal of materials science 33 (1998), S. 1405-1419 
    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 Fatigue crack propagation (FCP) of injection-moulded polystyrene (PS) and 95/5, 85/15 and 70/30 PS/high-density polyethylene (HDPE) blends at loading frequencies of 2 and 20 Hz was studied. The FCP results showed that increasing the HDPE content caused a progressive reduction of the fatigue crack growth rates, especially when a styrene/ethylene– butylene/styrene (SEBS) terpolymer was added as a compatibilizer. Increasing the loading frequency also led to a fatigue crack growth rate reduction. Moreover, the fatigue crack growth rates were lower at a given cyclic stress intensity factor range, ΔK, when the crack propagated normal, instead of parallel, to the melt-flow direction during injection moulding. Fractographic observations indicated that discontinuous growth bands (DGBs), associated with the fracture of crazes in the plastic zone, were present through most or all of the fracture surfaces of the PS/HDPE specimens. In the presence of sufficient HDPE, these DGBs were formed by the initiation, growth and coalescence of large dimples initiated at HDPE particles ahead of the microscopic crack front, similar to a multiple crazing effect. The loading frequency effect on the FCP behaviour of these blends is attributed to a time-dependent deformation process. It is concluded that the FCP behaviour of these blends is strongly affected by the loading direction with respect to the matrix and minor phase orientation, by the presence of a compatibilizer, by the composition of the blend and by the testing conditions. © Chapman & Hall.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004379121319
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  • 7
    Electronic Resource
    Electronic Resource
    Comparison of the fatigue propagation behaviour of polystyrene and 95/5 polystyrene/polyethylene blends (1998)
    Springer
    Journal of materials science 33 (1998), S. 1591-1606 
    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 The fatigue crack propagation (FCP) behaviour of polystyrene (PS) and 95/5 PS/high density polyethylene (HDPE) was studied at cycling frequencies (f) of 0.2, 2 and 20 Hz. At the latter two frequencies, the fatigue crack growth rates (FCGRs) in the blends were lower than in PS, especially when a styrene/ethylene–butylene/styrene (SEBS) triblock copolymer was added as a compatibilizer. The fractographic features observed were analysed in detail. Discontinuous growth bands (DGBs), associated with the fracture of crazes, formed at low FCGRs in PS and at low and high FCGRs in the blends. Large dimple-like features formed at intermediate FCGRs and fatigue striations at high FCGRs were observed in PS. The observations indicated that the reduction in FCGR when HDPE was added to PS was associated with the presence of stretched HDPE particles which fractured behind the crack front, with increased particle–matrix adhesion favoured by the compatibilizer. An increase in cycling frequency decreased the FCGRs, with the fractographic observations indicating that this effect was associated with a decrease in the time-dependent deformation in the fracture process zone slightly ahead of the crack tip.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017520005279
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  • 8
    Electronic Resource
    Electronic Resource
    Fracture behaviour of long fibre reinforced thermoplastics (1994)
    Springer
    Journal of materials science 29 (1994), S. 5732-5738 
    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 This paper deals with the fracture performance of injection moulded long glass fibre composites based on polybutylene terephthalate (PBT) and polypropylene (PP) matrices. The tensile behaviour of these composites is analysed using the shear lag theory taking into consideration the interfacial shear strength, fibre length distribution and fibre orientation in the mouldings. The fracture performance is investigated using the post yield fracture mechanics approach. The crack growth resistance of the PP and PBT long fibre composite was found to increase with increasing fibre volume content up to 35%. Above 35% a plateau in the fracture performance was observed. A combination of high fibre degradation and a change in the fibre orientation pattern of the moulded pieces is found to be responsible for the plateau region in the performance of the high concentration system. In fact, the dependence of the maximum crack growth resistance of the composites on fibre length and fibre orientation is also controlled by testing temperature. The competition between fibre-induced matrix deformation and the fibre pull-out determines the ability of the composites to resist crack propagation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349973
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  • 9
    Electronic Resource
    Electronic Resource
    Tensile properties of injection molded long fiber thermoplastic composites (1989)
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 10 (1989), S. 313-321 
    Details
    ISSN: 0272-8397
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper deals with the mechanical performances of a new class of injection molded long fiber composites based on PP and PBT matrices. Effects of material parameters such as fiber concentration, breakage, orientation, and matrix composition are analyzed. The critical fiber length, lεc, of the PP long fiber composite, evaluated from the pull-out length of the tensile fracture surface, was found to be much higher than those previously reported. Tensile strength calculated from the measured llεc and fiber length distribution in the molded samples was found to be in agreement with the measured values. From this work it is concluded that higher mechanical performances of the long fiber reinforced thermoplastics will be attained by the injection molding process to further reduce fiber breakage.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pc.750100507
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  • 10
    Electronic Resource
    Electronic Resource
    Role of morphology and coupling agent in fracture performance of glass-filled polypropylene (1988)
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 9 (1988), S. 360-367 
    Details
    ISSN: 0272-8397
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The effect of silane coupling agent on the morphology and fracture performance of particulates-filled polypropylene was investigated. The onset of the crystallization at the filler-matrix interface was observed by optical microscopy. This analysis shows that the silane alters the matrix morphology by inducing nucleation at the filler-matrix interface. This effect was attributed to the physisorbed layer of silane on the filler. The fracture performance of the composites was analyzed by the post yield fracture mechanics approach. The effect of coupling agent on the fracture performance was found to occur at a very low concentration, whereas subsequent increase in silane concentration had no effect. Furthermore, the effect of coupling agent depended on concentration of filler. Silane treatment had a detrimental effect at low concentration of filler. However, at high concentration of filler, an improvement in the filler-matrix adhesion had a beneficial effect on the fracture performance. Two phenomena, the morphological effect and the competition between the contribution of the matrix-filler interface and the contribution of the matrix, were found to be possible explanations for the variation of KRmax with filler concentration and adhesion at the matrix-filler interface.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pc.750090509
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