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  • 1
    Electronic Resource
    Electronic Resource
    Fibre formation in copolyamide — Ethylene-vinyl acetate copolymer mixtures (1991)
    Springer
    Fibre chemistry 22 (1991), S. 228-231 
    Details
    ISSN: 1573-8493
    Source: Springer Online Journal Archives 1860-2000
    Topics: Technology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Conclusions Formation of microfibres, both of the copolyamide and also of the ethylene-vinyl acetate copolymer in complementary mixtures, has been shown, which contradicts the conclusion of the Van Oene theory. Specific fibre formation depends on the degree of dispersion of the fibre-forming components; when there is a very fine dispersion, the process is not realized. Basic features of the rheological behavior of SPA-SEVA mixture melts have been established: a sharp decrease in the viscosity of melts of mixtures as compared with the viscosity of the starting components and an anomalously large increase in elasticity (jet expansion) of the mixture melt. This is caused by the formation of SPA microfibres in an SEVA matrix and of SEVA fibres in an SPA matrix. The anomalously high values of jet expansion are connected with additional deformation of the SEVA in the SPA matrix because of strong intermolecular interaction at the interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00548095
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  • 2
    Electronic Resource
    Electronic Resource
    Equipment for spinning ultrathin synthetic fibres (1994)
    Springer
    Fibre chemistry 25 (1994), S. 398-400 
    Details
    ISSN: 1573-8493
    Source: Springer Online Journal Archives 1860-2000
    Topics: Technology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Conclusions The possibility has been demonstrated of preparing fundamentally new types of synthetic fibres through unique properties which are usable for the manufacture of goods for national demand, with high hygienic and comfort properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00551637
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  • 3
    Electronic Resource
    Electronic Resource
    Rheological properties of melts and structure formation in polyoxymethylene-ethylene-propylene copolymer mixtures (1989)
    Springer
    Fibre chemistry 20 (1989), S. 160-163 
    Details
    ISSN: 1573-8493
    Source: Springer Online Journal Archives 1860-2000
    Topics: Technology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Conclusions It has been shown that the conclusion of the Van Oene theory that the polymer with the greater melt elasticity should form a disperse type of structure and the polymer with the lower elasticity should form a stratified (laminar) structure is not fulfilled for polyoxymethylene-ethylene-propylene copolymer mixtures at ratios of 80:20 and 20:80. This means that at low content of the disperse phase polymer a disperse morphology is the most typical, regardless of the degree of elasticity of the melt. It has been found that an elevated elasticity of the disperse phase polymer does not aid “specific fibre-formation.” A disperse state of the polymer in a mixture and the formation of an interfacial layer lead to a decrease in the temperature (by tens of degrees) and heat effect (several-fold) of phase transitions. The interconnection between structure-formation processes and the rheological properties of the polymer mixture melt is manifested in a decrease in viscosity, an intensification of the viscosity anomaly, and an increase in the elasticity of the melt mixture as compared with these same characteristics of the starting polymers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00633043
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  • 4
    Electronic Resource
    Electronic Resource
    The entry angle at the spinneret channel as a factor in the formation of fibres of the matrix-fibril type (1980)
    Springer
    Fibre chemistry 11 (1980), S. 492-495 
    Details
    ISSN: 1573-8493
    Source: Springer Online Journal Archives 1860-2000
    Topics: Technology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00547313
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  • 5
    Electronic Resource
    Electronic Resource
    Thin-fibre filtering materials (1992)
    Springer
    Fibre chemistry 24 (1992), S. 4-7 
    Details
    ISSN: 1573-8493
    Source: Springer Online Journal Archives 1860-2000
    Topics: Technology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Conclusions A thin-fibre filter of bulk-type action has been developed intended for precise cleanup of practically all forms of liquid and gaseous media from mechanical particles having a size of 0.3 µm or greater. The structure of the filter material is formed not by laws of chance but under the action of rheological forces and is controlled by technological parameters. This makes it possible to regulate the pore size and porosity of the filter material, and to achieve uniformity in its structure. On the basis of results from interdepartmental certification tests, the filters developed have been recommended for industrial manufacture and for use in plants of the electronic, chemical-photographic, and medical-biological branches of industry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00557167
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  • 6
    Electronic Resource
    Electronic Resource
    Physicomechanical properties of ultrathin polyoxymethylene fibres (1982)
    Springer
    Fibre chemistry 14 (1982), S. 145-148 
    Details
    ISSN: 1573-8493
    Source: Springer Online Journal Archives 1860-2000
    Topics: Technology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00549070
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  • 7
    Electronic Resource
    Electronic Resource
    “Specific fibre-formation” phenomenon in polymer mixtures containing a water-soluble matrix component (1988)
    Springer
    Fibre chemistry 20 (1988), S. 79-82 
    Details
    ISSN: 1573-8493
    Source: Springer Online Journal Archives 1860-2000
    Topics: Technology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Conclusions The basic features of rheological behavior of melts of mixtures of polypropylene or polyethylene with polyvinyl alcohol (PVA) have been established: a decrease (2.5 to 5-fold) in viscosity of the melt of the mixture as compared with the viscosity of the polymers being mixed and an increase in elasticity (swelling) of the mixture melt. These features are connected with fibre formation of both the polyolefin in the PVA matrix and also of PVA in a polyolefin matrix during flow, which does not agree with the Van Oene theory. The possibility has been demonstrated of processing mixtures containing PVA via a melt, with the objective of preparing ultrathin polyolefin fibres and carrying out the extraction process with water. At polypropylene (or polyethylene) contents in the mixture up to 50% by weight, during the flow process the polyolefin forms an outer fibrous structure which is penetrable by the solvent (water) and is filled with continuous length microfibres. This structure, which is obtained directly during the spinning process, is extremely important for the development of microfibres for cleaning up liquid media, for example.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00549233
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  • 8
    Electronic Resource
    Electronic Resource
    Structural features and properties of fibres based on mixtures of an ethylene-vinylacetate copolymer with a copolyamide (1993)
    Springer
    Fibre chemistry 24 (1993), S. 134-137 
    Details
    ISSN: 1573-8493
    Source: Springer Online Journal Archives 1860-2000
    Topics: Technology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Conclusions By x-ray analysis, we have confirmed the previously expressed hypothesis of a forced deformation of SÉVA on flow of an SÉVA—SPA mixture as a result of specific interaction of the components at the interface: the degree of orientation of the SÉVA macromolecules in the microfibres is higher than in a monofilament from the starting polymer. It has been shown that ultrathin SÉVA fibres are characterized by a porosity, caused by micro- and macro-hollows, which causes a decrease in their strength as compared with the strength of ordinary SÉVA fibres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00555032
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  • 9
    Electronic Resource
    Electronic Resource
    Structural features and properties of composite and ultrathin fibres from melts of polymer mixtures (1993)
    Springer
    Fibre chemistry 24 (1993), S. 234-236 
    Details
    ISSN: 1573-8493
    Source: Springer Online Journal Archives 1860-2000
    Topics: Technology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00554721
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  • 10
    Electronic Resource
    Electronic Resource
    Rheology of molten blends of polyoxymethylene and ethylene-vinyl acetate copolymer and the microstructure of extrudates as a function of their melt viscosities (1980)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 20 (1980), S. 1023-1028 
    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: Blends of polyoxymethylene (POM) with a copolymer of ethylene and vinyl acetate (CEVAc) have been studied. The effect of viscosity ratio for melts of the components on the processes of fiber formation in extrudates and on the rheological properties of the molten blend has been tested. The viscosity ratio of the fiber-forming POM and the matrix varied in the range 0.35-27.7. POM ultrathin fibers of unlimited length can be formed in the CEVAc only at a viscosity ratio close to unity. For ratios much greater than unity, the extrudate is found to contain short fibers and a finely dispersed powder or no fibers at all. If the viscosity of the POM melt is lower than that of the matrix, films are formed in addition to fibers. The second factor that governs fiber formation is the extrusion shear stress. An optimum shear stress exists at which the amount of ultrathin fibers is a maximum.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760201507
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