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  • 1
    Electronic Resource
    Electronic Resource
    Orientation stretching of a composite fibre based on high-density polyethylene and polyethylene terephthalate (1988)
    Springer
    Fibre chemistry 20 (1988), S. 21-24 
    Details
    ISSN: 1573-8493
    Source: Springer Online Journal Archives 1860-2000
    Topics: Technology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Conclusions An effect of the components on the possible stretch ratio of a composite fibre based on high-density polyethylene (HDPE) and polyethylene terephthalate (PET) has been detected, depending on the orientation stretch temperature, and on the composition and phase structure of the composite. In spite of the fact that the total degree of stretch of the composite fibre is greater than the possible degree of stretch for “pure” PET, the actually attained degree of orientation of the PET component does not exceed the degree of orientation of the homopolymer. The presence of two types of HDPE has been detected in the oriented fibres — weakly oriented and strongly oriented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00544754
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of orientation stretch on structure of a composite fibre based on high-density polyethylene and polybutylene terephthalate (1990)
    Springer
    Fibre chemistry 21 (1990), S. 407-411 
    Details
    ISSN: 1573-8493
    Source: Springer Online Journal Archives 1860-2000
    Topics: Technology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Conclusions Due to the effect of the HDPE matrix in composite fibres based on HDPE-PBTP it is possible to draw the polybutylene terephthalate component to degrees of orientation which exceed the degree of orientation attained for pure PBTP. The introduction of chemical cross-links between the HDPE and the PBTP under radiative treatment permits one to expand the temperature service range of polyethylene fibres containing a small amount of the polyester. The possibility of transition from orthorhombic chain packing to a mesomorpohic state in a HDPE composite fibre on heating above the equilibrium melting point under isometric conditions has been demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00557041
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  • 3
    Electronic Resource
    Electronic Resource
    Vergleichende Untersuchung der Nahordnung in unverzweigten Alkanen und im Polyäthylen (1978)
    Springer
    Colloid & polymer science 256 (1978), S. 301-301 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , 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/BF01550686
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of molecular weight on the structure and temperature behavior of a thermotropic main-chain liquid crystalline copolyester (1995)
    Springer
    Colloid & polymer science 273 (1995), S. 23-31 
    Details
    ISSN: 1435-1536
    Keywords: Structure ; phase transitions ; x-ray scattering
    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 structure of a fully aromatic thermotropic liquid crystalline (LC) copolyester poly-[(phenyl-p-phenylene)-co-(terephthalate)-co-(p-hydroxybenzoate)] (PES) prepared from terephthalic acid, phenylhydroquinone, andp-hydroxybenzoic acid at a molar ratio of 45/45/10, respectively, was studied at ambient and elevated temperatures by means of x-ray diffraction and differential scanning calorimetry as a function of molecular weight. On heating of PES fibers with fixed ends an irreversible phase separation process takes place above the glass transition point and two different crystalline phases are formed. A model is proposed where the phases are assumed to contain the constituents of the statistical copolymer in different amounts. The relative volume fraction of the two crystalline modifications depends on the molecular weight of the investigated fibers. At higher temperatures the melting of the two crystalline phases and their transition to a LC nematic mesophase is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655670
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  • 5
    Electronic Resource
    Electronic Resource
    X-ray analysis of the structure of a thermotropic main-chain liquid-crystalline copolyester (1994)
    Springer
    Journal of materials science 29 (1994), S. 328-337 
    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 and phase behaviour of the thermotropic main-chain liquid-crystalline copolyester poly[(phenyl-p-phenylene)-co-(terephthalate)-co-(p-hydroxybenzoate)] (PES) prepared from terephthalic acid, phenylhydroquinon andp-hydrobenzoic acid (molar ration 45/45/10) is determined by X-ray diffraction and differential scanning calorimetry. This random copolyester shows up to 340°C periodicc-axis order in its X-ray diffraction pattern as well as sharp and diffuse reflections at the equator and other crystallographic directions, indicating well ordered three-dimensional crystalline structure. Two crystalline modifications are observed for quenched and annealed fibres, which are both orthorhombic with slightly different unit cell sizes. Indications of other phases at still higher temperatures are reported. They are believed to be a novel mesophase followed by a nematic liquid-crystalline phase and the isotropic melt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01162487
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  • 6
    Electronic Resource
    Electronic Resource
    Formation of a phase structure of the “fibrils in matrix” type in a composite fibre based on high-density polyethylene and polyethylene terephthalate (1988)
    Springer
    Fibre chemistry 19 (1988), S. 277-280 
    Details
    ISSN: 1573-8493
    Source: Springer Online Journal Archives 1860-2000
    Topics: Technology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Conclusions Regions of component ratio and conditions for obtaining a composite fibre of the “fibrils in matrix” type have been determined for the HDPE-PET system. At an HDPE-PET ratio of 60:40, phase inversion takes place and a structure of the “interpenetration networks” type is realized. Under identical fibre spinning conditions, the formation of a phase structure of the “fibrils in matrix” type can be regulated by varying the temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00578394
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  • 7
    Electronic Resource
    Electronic Resource
    Analysis of urinary steroids using the LKhM-80 chromatograph (1995)
    Springer
    Biomedical engineering 29 (1995), S. 273-274 
    Details
    ISSN: 1573-8256
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00557417
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  • 8
    Electronic Resource
    Electronic Resource
    Mesophase structure of some flexible chain polymers (1992)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 32 (1992), S. 1188-1203 
    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: The mesophase structures of some flexible chain polymers, which do not contain mesogenic groups, but are able to form thermodynamically equilibrium mesomorphic states, were studied by means of the X-ray analysis, the differential scanning calorimetry, and other methods. The mesophase polyethylene in bicomponent polymer blends, mesomorphic ultra-high molecular weight polyphosphazenes, and membrane polyvinylorganosilanes were investigated. The scheme of polymer phase transitions is discussed. Besides conformational disordering, the step-by-step loss of different levels of the positional order (i.e. the multiple-step character of melting) of flexible, semiflexible, and stiff chain polymers is deduced and illustrated by examples from the authors' experience and from the literature.
    Additional Material: 29 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760321703
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  • 9
    Electronic Resource
    Electronic Resource
    Rheology and morphology of polymer blends containing liquid-crystalline component in melt and solid state (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 42 (1991), S. 363-372 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    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: The rheological properties of polymer blends containing polysulfone and LC polyester have been investigated in terms of the morphology and physical-mechanical characteristics of the extrudates. The peculiarities of rheological behavior are connected with the morphology of stream, the latter being maintained also in solid extrudates. The reinforcement of an isotropic matrix by LC polymers as well as formation of an anisotropic surface layer leads to a specific change in the strength properties of compositions. A maximal increase in the strength and initial modulus was observed for blends containing not more than 10% LC polymer.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070420208
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  • 10
    Electronic Resource
    Electronic Resource
    Transport characteristics and other physicochemical properties of aged poly(1-(trimethylsilyl)-1-;propyne) (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 48 (1993), S. 1935-1944 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    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: Samples of poly[1-(trimethylsilyl)-1-propyne] were kept for about 4 years in ambient conditions. The permeability and diffusion coefficients were examined and found to be decreased by 1-2 orders of magnitude. To ascertain the nature of the changes underwent during long-term storage of this polymer, several physicochemical methods were applied: positron annihilation, wide-angle X-ray diffraction, spin probe, and density evaluation. These studies indicated that a decrease of free volume and more close chain packing took place during the aging process. IR spectroscopy and 13C-NMR showed that oxygen-containing products appeared in the polymer after long-term storage. This should result in a certain decrease in the rigidity of the backbone chains and more intensive interchain in-teractions, and, hence, in a decrease in the free volume of the aged polymer. © 1993 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070481107
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