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  • 1
    Electronic Resource
    Electronic Resource
    Study of haemodialysis materials; physico-chemical and biological characterization of EVALVA, EVAPA and heparinized EVAPA (1994)
    Springer
    Journal of materials science 5 (1994), S. 844-849 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Partially hydrolyzed ethylene/vinyl acetate copolymers were modified by the covalent binding of a heparin-complexing polymer and further heparinized in order to improve their blood compatibility. These heparinizable polymeric materials (EVAPA) were obtained by a two-step reaction between an ethylene/vinyl alcohol/vinyl acetate (EVALVA) terpolymer, and the heparin complexing polymer N2LL. The physico-chemical characterization of EVALVA, EVAPA and heparinized-EVAPA was carried out through thermal analysis, SEM, contact angle, potentiometric measurements, water uptake and FT-IR spectroscopic measurements. The biocompatibility of the above-mentioned samples was evaluated usingin vitro methods, through the determination of heparin release in phosphate buffer solution (PBS) and in human plasma, and with the investigation of hemostasis activation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01172022
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Nuclear magnetic resonance microscopy of multicomponent polymeric materials (1993)
    Springer
    Journal of materials science 12 (1993), S. 728-731 
    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/10.1007/BF00626700
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Polypropylene/ethylene-co-propylene blends: influence of molecular structure of EPR and composition on phase structure of isothermally crystallized samples (1991)
    Springer
    Journal of materials science 26 (1991), S. 4033-4047 
    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 structure of phases and interphases in samples crystallized under controlled undercoolings, of isotactic polypropylene/ethylene-co-propylene copolymers (iPP/EPR blends) was examined using optical and electron microscopy and small-angle X-ray scattering and differential scanning calorimetry. The study was undertaken to establish the influence of molecular structure of the EPR copolymers and blend composition on the phase structure developed in samples isothermally crystallized at relatively low undercoolings. Optical and electron microscopy revealed that the molecular structure and composition of the EPR phase play a predominant role in determining the mode and state of dispersion of the minor rubber component. It was also found that the crystallization process of iPP from its blends was influenced by the presence of the EPR phase with no regular dependence on its molecular structure and composition. For a given crystallization temperature, a decrease in thickness of the crystalline lamellae,L c, and an increase in the amorphous interlamellar layer,L a were observed. TheL c andL a values were found to be strictly related to the blend composition;L c decreasing andL a increasing with increasing EPR content in the blend.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553486
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Interaction between low-profile agents and glass fibres in polyester-based composites (1992)
    Springer
    Journal of materials science 27 (1992), S. 4131-4138 
    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 Scanning electron microscope and differential scanning calorimetry studies were used to study the morphology and thermal properties of cured systems constituted of different unsaturated polyester formulations, two conventional low-shrink additives and one suitably synthetized additive. The aim was to clarify the influence of these low-profile agents on the resulting phase structure and on the thermal behaviour of the systems. Moreover, the influence was investigated of low-profile agents on the fibre/matrix adhesion in composite materials reinforced with glass fibres coated by silane coupling agents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01105116
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Some properties of nickel-coated carbon fibre-polypropylene composite at microwave frequencies (1990)
    Springer
    Journal of materials science 25 (1990), S. 3083-3088 
    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 Some properties of nickel-coated carbon fibre-polypropylene composite are considered at microwave frequencies in the range 8 to 12 GHz. The paper presents the measured values of the insertion and return losses and the equivalent input impedance in the above frequency band. Measurements were performed on composite material for different nickel-coated fibre concentrations of 0, 5, 10, 16 and 28 wt%. The filler effects shows a transition region and identifies the dependency of the electrical properties on these concentrations. Furthermore, shielding effectiveness is calculated for the given concentrations and it is found that its value could reach more than 30 dB over the whole frequency band for a specimen of 2.6 mm thickness and with 28 wt% concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00587654
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of fibre surface treatment on yielding and fracture behaviour of glass fibre-polypropylene composite (1991)
    Springer
    Journal of materials science 26 (1991), S. 2100-2106 
    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 Two parallel studies of the mechanical properties of composites based on modified polypropylene is presented. The fillers used were either uncoated-glassy fibres or glassy fibres coated with aluminium. The tensile properties and fracture behaviour are investigated as a function of filler content over a range of temperatures and strain rates. The measured elastic modulus, tensile strength, and fracture parameters, G c and K c, showed dependencies on filler content. The observed enhancement is found to be remarkable in the case of composites containing uncoated surface treated glass fibres. The tensile yield stress of all the composites prepared showed strain rate and temperature dependence. Stress activation volume and activation energy of single-activated yielding processes are determined. The observed fracture morphology could explain the reinforcement behaviour of the measured mechanical properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00549174
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Formulation, curing, morphology and impact behaviour of epoxy matrices modified with saturated rubbers (1992)
    Springer
    Journal of materials science 27 (1992), S. 786-792 
    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 New formulations of rubber toughening agents for difunctional and tetrafunctional commercial epoxies are attempted, on the basis of their increased thermal stability compared with classical unsaturated elastomers. Quite satisfactory results are obtained where a block copolymer of polydimethylsiloxane and polyoxyethylene elastomer or a functionalized poly (1 -butene) in difunctional epoxy are used. On the other hand, poor results are obtained when the same elastomers are employed in tetrafunctional epoxies. A tentative explanation is given on the basis of the different networks obtained in the two matrix systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02403897
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Formulation, curing, morphology and impact behaviour of epoxy matrices modified with saturated rubbers (1992)
    Springer
    Journal of materials science 27 (1992), S. 786-792 
    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 New formulations of rubber toughening agents for difunctional and tetrafunctional commercial epoxies are attempted, on the basis of their increased thermal stability compared with classical unsaturated elastomers. Quite satisfactory results are obtained where a block copolymer of polydimethylsiloxane and polyoxyethylene elastomer or a functionalized poly (1 -butene) in difunctional epoxy are used. On the other hand, poor results are obtained when the same elastomers are employed in tetrafunctional epoxies. A tentative explanation is given on the basis of the different networks obtained in the two matrix systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00554054
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Highly filled particulate composites enhancement of performances by using compound coupling agents (1990)
    Springer
    Journal of materials science 25 (1990), S. 3255-3261 
    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 compressive and bending strength of epoxy and unsaturated polyester resins composites containing high volume of particulate silicas have been studied. Different coupling agents were tested, whose formulation was tailored to allow the creation of chemical bonding between filler and matrix. Fracture surfaces were analysed by scanning electron microscopy, and a qualitative correlation was found between increasing strength and interfacial adhesion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00587683
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Polypropylene/ethylene-co-propylene blends: influence of molecular structure of EPR and composition on phase structure of isothermally crystallized samples (1991)
    Springer
    Journal of materials science 26 (1991), S. 4033-4047 
    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 structure of phases and interphases in samples crystallized under controlled undercoolings, of isotactic polypropylene/ethylene-co-propylene copolymers (iPP/EPR blends) was examined using optical and electron microscopy and small-angle X-ray scattering and differential scanning calorimetry. The study was undertaken to establish the influence of molecular structure of the EPR copolymers and blend composition on the phase structure developed in samples isothermally crystallized at relatively low undercoolings. Optical and electron microscopy revealed that the molecular structure and composition of the EPR phase play a predominant role in determining the mode and state of dispersion of the minor rubber component. It was also found that the crystallization process of iPP from its blends was influenced by the presence of the EPR phase with no regular dependence on its molecular structure and composition. For a given crystallization temperature, a decrease in thickness of the crystalline lamellae,L c, and an increase in the amorphous interlamellar layer,L a were observed. TheL c andL a values were found to be strictly related to the blend composition;L c decreasing andL a increasing with increasing EPR content in the blend.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02402944
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    Paper (German National Licenses)
    Fulltext
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