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  • Digitale Medien  (5)
  • 1985-1989  (5)
  • mesophase  (5)
  • Adhesion coefficient
  • 1
    Digitale Medien
    Digitale Medien
    The influence of the mesophase on the transverse and longitudinal moduli and the major poisson ratio in fibrous composites (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 561-569 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Fibrous composites ; mesophase ; longitudinal elastic modulus ; transverse elastic modulus ; major Poisson ratio
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract Expressions for the evaluation of the transverse and longitudinal elastic moduli and the major Poisson ratio of unidirectional fiber composites are derived. The model described is based on the correct version of Kerner's model, which in our case is conveniently modified by introducing a mesophase layer between the fiber and the matrix in the representative volume element surrounding the typical fiber. The expression for the longitudinal elastic modulus derived in this paper, and the law of mixtures already presented in previous papers, give concordant results. Therefore, the law of mixtures, taking the mesophase also into account, and the two-term unfolding model for the mesophase are used for the evaluation of its extent and its properties. The model was applied to a glass filament-epoxy resin composite and its predictions were found to be in good agreement with the experimental data.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01412593
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Phase transformation, at the boundary layers between polymers, and solid surfaces (1985)
    Springer
    Colloid & polymer science 263 (1985), S. 863-872 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Composites ; mesophase ; unfolding models
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract The size of the mesophase, which constitutes a boundary layer between fillers and matrix in composites, has been efficiently evaluated by the modified two-term unfolding model, which was based on delicate DSC measurements of the heat capacity jumps at the glass transitions of the composite and its constituent phases [1,2]. This model is now used to evaluate the mesophase along the whole viscoelastic spectrum of the composite, by making measurements of the storage and loss compliances or moduli of the composite and matrix and without making recourse to any other type of special measurement at the glass transition temperature of the substances. By applying this model the following important results were derived: i) Lipatov's empirical formula for defining the mesophase atT g was shown to yield reasonable results and ii) the evaluation of the size of mesophase over the entire viscoelastic spectrum was shown to remain almost constant and in conformity with the values defined by the other versions of the model. Extensive application of the experimental results of the literature indicated the mutual proof of the validity of these affine models.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01469622
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  • 3
    Digitale Medien
    Digitale Medien
    Accurate evaluation of the transverse shear modulus in unidirectional fibrous composites (1987)
    Springer
    Rheologica acta 26 (1987), S. 182-192 
    Details
    ISSN: 1435-1528
    Schlagwort(e): Transverseshear modulus ; unidirectionalfiber composite ; mesophase
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Abstract A new relation for the prediction of the transverse shear modulus in unidirectional fiber composites has been derived. The theoretical results of this relationship are in better agreement with the experiments than those of other relations, existing in the literature. The discrepancies, which are observed among the theoretical predictions and the experimental values, are explained by the consideration of the boundary layers existing between the matrix and the fibers of the composite. A new model, which includes the intermediate phase between the matrix and the fiber, called the mesophase, is considered in order to take into account the above-mentioned layers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01331976
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  • 4
    Digitale Medien
    Digitale Medien
    The shear modulus in the fiber direction of unidirectional fiber composites based on the concept of mesophase (1987)
    Springer
    Rheologica acta 26 (1987), S. 322-327 
    Details
    ISSN: 1435-1528
    Schlagwort(e): Shear modulus ; fiber composite ; mesophase
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Abstract A new and accurate relationship for the shear modulus in the fiber direction of unidirectional fiber composites is derived, based on the Kerner model concepts but not using its approximate relationships. Furthermore, this model is extended by taking into account the mesophase between the fiber and the matrix accomodating smoothly the mechanical properties between neighbouring phases. The introduction of the mesophase results in an improvement of the theoretical predictions, which now approach close to experimental values for the moduli of different fibrous composites.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01332249
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  • 5
    Digitale Medien
    Digitale Medien
    The elastic modulus of particulate composites using the concept of a mesophase (1986)
    Springer
    Rheologica acta 25 (1986), S. 350-358 
    Details
    ISSN: 1435-1528
    Schlagwort(e): Composite ; elastic modulus ; mesophase
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Abstract A theoretical model for the evaluation of the elastic modulus in particulate composites has been developed. The method takes into account the existence of a mesophase between main phases, which constitutes an important parameter influencing the behaviour of a composite material. This layer between the matrix and filler develops different physico-chemical properties from those of the constituent phases and variable ones along its thickness. The effect of the progressive variation of the elastic modulus of the mesophase on the modulus of the composite was estimated by applying various simple laws of variation. Convenient laws of variation were introduced, varying from a simple one, assuming a linear law, to a more refined one using a parabolic law. Experimental results with particulates, based on iron-filled epoxy composites, compared satisfactorily with other models. However, the model based on a parabolic law was superior to all others on physical grounds.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01331505
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