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  • 1
    Electronic Resource
    Electronic Resource
    Tensile behaviour and fracture toughness of poly(ether ether ketone)/poly(ether imide) blends (1996)
    Springer
    Polymer bulletin 37 (1996), S. 111-118 
    Details
    ISSN: 1436-2449
    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: Summary The bulk tensile behaviour of poly(ether ether ketone) and poly(ether imide) homopolymers and their blends has been investigated, and the temperature and strain rate dependence of the yield stress discussed in terms of simple Eyring rate theory. In fracture mechanics tests, the KIC of PEEK was found to decrease significantly with increasing test speed, whereas the KIC of PEI showed little rate sensitivity. Therefore, although a gradual increase in KIC with increasing PEEK content was observed in the blends at low loading rates, this effect was anticipated to be less pronounced at higher loading rates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00313826
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Microhardness-structure correlation of iPP/EPR blends: influence of molecular weight and EPR particle content (1998)
    Springer
    Colloid & polymer science 276 (1998), S. 786-793 
    Details
    ISSN: 1435-1536
    Keywords: Key words Microhardness ; poly(propylene) ; ethylene-co-propylene rubber ; blends ; surface free energy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The influence of molecular weight on the mechanical properties of isotactic poly(propylene) (iPP) and iPP blended with ethylene-propylene copolymers has been investigated by means of the microhardness technique. The hardness (H) of iPP is shown to slightly decrease with increasing molecular mass, within the range of molecular weights investigated. The H-decrease is correlated to a loss of crystallinity as the average molecular weight increases. On annealing, the mechanical properties are enhanced as a consequence of an increase in both, the degree of crystallinity and the crystalline lamellar thickness. A value of H ∞ c for iPP crystals of infinite thickness in the α-form is proposed for the first time. The inclusion of EPR particles in the iPP matrix softens the material. This result could be explained in terms of an increase in the basal surface free energy of the iPP crystals with increasing amount of rubber content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050311
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Thin film and bulk deformation behaviour of poly(ether ether ketone)/poly(ether imide) blends (1997)
    Springer
    Journal of materials science 32 (1997), S. 3037-3042 
    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 deformation behaviour of amorphous thin films of poly(ether ether ketone) (PEEK)/poly(ether imide) (PEI) blends was investigated over a wide temperature range by optical and transmission electron microscopy. All the materials showed localized shear deformation at temperatures well below Tg. In pure PEI and in blends with up to 60 wt% PEEK content, a transition from shear deformation to disentanglement crazing occurred as the temperature was raised. However, this transition was absent in PEEK, which deformed by shear over the whole temperature range, and similar behaviour was found for PEI/80 wt% PEEK. It is argued that at high PEEK content disentanglement crazing is suppressed by strain-induced crystallization and some evidence for crystalline order in deformed regions of initially amorphous PEEK thin films was obtained by electron diffraction. The thin film deformation behaviour of the blends was also shown to be consistent with their bulk deformation behaviour, a high temperature ductile–brittle transition being observed at low PEEK content in tensile tests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018669827292
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A Viscoelastic Analysis of the Creep Behaviour of a Chopped Strand Mat E-Glass Fibre Reinforced Vinylester Resin (1999)
    Springer
    Mechanics of time-dependent materials 3 (1999), S. 71-84 
    Details
    ISSN: 1573-2738
    Keywords: chopped strand mat ; creep behaviour ; debonding ; nonlinear power law ; vinylester resin ; viscoelastic analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The viscoelastic response of a chopped strand mat E-glass fibre reinforced vinylester resin has been studied over a wide range of applied stress levels. At low applied stress levels, the material exhibited a linear viscoelastic response well represented by Schapery's power law model with constant C and n terms. At higher stresses nonlinear behaviour was observed which apparently is caused by the multiplicity of complex local phenomena associated with and preceding damage development (plastic deformation of the matrix, interfacial slippage, fiber-matrix debonding). The limits of linear viscoelastic behaviour and of damage initiation – about 0.48% strain or 42 MPa – coincide for this material. However, for successful modelisation of uniaxial creep strain in the nonlinear range a modified power law is proposed which uses stress-dependent creep parameters C and n.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009808808898
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    Paper (German National Licenses)
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