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  • 1
    Electronic Resource
    Electronic Resource
    Breaking elongation distributions of single fibres (1997)
    Springer
    Journal of materials science 32 (1997), S. 3905-3912 
    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 breaking elongation distributions of cotton, regenerated cellulose and polyester fibres have been investigated. The distributions of the cotton fibres are positively skewed whereas those of the regenerated cellulose fibres are negatively skewed. All of these distributions have longer tails than normal distributions. Although being approximately symmetric, the distributions of the polyester fibres also show longer tails than normal distributions. A mixture of Gaussian and Lorenzian functions is suggested for the resolutions of the symmetric distributions. For the asymmetric distributions with positive skewness, Gamma functions provide the best fit for their distributions. A mixture of Normal and Gumbel (largest or smallest) can also provide close curve-fittings to the asymmetric distributions with negative skewness as well as positive skewness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018656530385
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Crystalline structure of developing cotton fibers (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 34 (1996), S. 1451-1459 
    Details
    ISSN: 0887-6266
    Keywords: cotton fibers ; cell development stages ; wide angle x-ray diffraction ; crystalline structure ; crystallinity and crystallite size ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The crystalline structure of dried cotton fibers at varying development stages has been investigated using wide angle x-ray diffraction (WAXS) techniques. The cellulose I crystalline structure has been confirmed on dried SJ-2 Acala cotton fibers collected at varying developmental stages and at maturity. The cellulose I crystalline structure is clearly evident at the early developmental stage of 21 days postanthesis (dpa). The crystal system remains unchanged during the cotton fiber biosynthesis and at maturity. The degree of crystallinity and crystallite dimensions in the cotton fibers increase with cell development. The most significant increments are observed between 21 and 34 dpa (i.e., during the first half of the secondary wall thickening process). The unit cell sizes slightly decrease and thus the crystal density increases with fiber development. The alignment of the glucosidic rings in respect to the 002 planes improves with fiber cell development. © 1996 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 3
    Electronic Resource
    Electronic Resource
    Structural transformation of ultra-high modulus and molecular weight polyethylene fibers by high-temperature wide-angle X-ray diffraction (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 35 (1997), S. 623-630 
    Details
    ISSN: 0887-6266
    Keywords: ultra-high modulus and molecular weight polyethylene fibers (UHM-WPE) ; high-temperature wide-angle x-ray diffraction (HTWAXD) ; crystal structure ; orthorhombic/monoclinic/pseudohexagonal transformation ; annealing and thermal behavior ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Wide-angle x-ray diffraction (WAXD) of the ultra-high modulus and molecular weight polyethylene (UHMWPE) fibers at room temperature shows a predominantly orthorhombic structure with trace amount of nonorthorhombic crystals and very low amorphous contents. The calculated unit cell dimensions a and b of the orthorhombic crystals are 7.36 (±0.04) Å, and 4.89 (±0.04) Å, respectively. The apparent crystallite sizes perpendicular to the orthorhombic 110 and 200 reflection planes are 169.8 and 143.4 Å, respectively. The crystallite size perpendicular to the nonorthorhombic 010 reflection is 149.4 Å. The crystal density is calculated to be 1.02 g/cc. With increasing temperature, the thermal expansion coefficient in the a direction is much higher than that in the b direction which explains the structural transformation from the orthorhombic crystals to a pseudohexagonal form. Tension along the fiber axis while being heated during the high-temperature x-ray diffraction (HTWAXD) scanning has shown enhanced structural transformation from the orthorhombic form to the monoclinic form. Structural transformation from the orthorhombic form to the pseudohexagonal phase is not observed on the UHMWPE fibers under axial tension or annealing conditions in HTWAXD. © 1997 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys, 35: 623-630, 1997
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 4
    Electronic Resource
    Electronic Resource
    The molecular structure of polyacrylonitrile fibers (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 62 (1996), S. 1925-1932 
    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: In spite of considerable effort, the understanding of the molecular structure of polyacry-lonitrile-based fibers is still incomplete. This paper shows that molecular modeling based on molecular mechanics and dynamics can be used to study the molecular structure of polyacrylonitrile-based fibers with appropriate strategies. Additional information has thus been obtained which is impossible to obtain by using other instrumental techniques. It is concluded that the chain conformations of polyacrylonitrile-based fibers are similar to those of nematic liquid crystal composites in which the chains are formed by the irregular combination of two or more species of unit groups. Hence the polyacrylonitrile molecules should be viewed as ‘aperiodic chain molecules’. © 1996 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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