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  • birefringence  (2)
  • Black soil  (1)
  • 1985-1989  (3)
  • 1965-1969
  • 1955-1959
  • 1940-1944
  • 1
    Electronic Resource
    Electronic Resource
    Mechanical properties of oriented fibres of semicrystalline polymers based upon orientation function from optical properties (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 128-130 
    Details
    ISSN: 1435-1536
    Keywords: Orientation of polymer chains ; mechanical properties ; birefringence ; deformation scheme
    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 computation of the orientational averages is a great problem in the case of semicrystalline polymers. In a previous communication [1] it has been shown that sinθ=f(λ) sinθ′ describes the orientational changes satisfactorily for a certain class of polymers. In this paper some alternative deformation schemes are also discussed. It has been concluded that birefringence provides a useful guideline in the choice of a deformation scheme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414838
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  • 2
    Electronic Resource
    Electronic Resource
    Unified study of the different physical properties of amorphous polymers (1988)
    Springer
    Colloid & polymer science 266 (1988), S. 501-508 
    Details
    ISSN: 1435-1536
    Keywords: Amorphous polymers ; mechanical properties ; birefringence ; thermal condcutivity ; thermal expansivity
    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 Uptil now it has not been possible to explain the different physical properties of amorphous polymers using a model based on a single conceptual scheme. In this paper, a phenomenological model is proposed which tries to explain the mechanical, optical and thermal properties (both thermal conductivity and expansivity) of amorphous polymers. The model has similarities with the composite model, proposed by the present authors, which has proved to be successful in interpreting the different physical properties of semicrystalline polymers. The present model considers the bulk form of the polymer as an aggregate of microscopic units possessing intrinsic physical properties. On drawing, the development of anisotropy in different physical properties is supposed to be due to the development of preferred orientation of these units. The development of the preferred orientation has been estimated directly from birefringence data. The agreement between the calculated and experimental values of the elastic modulus, thermal conductivity and thermal expansivity of PVC, PMMA and PS is found to be reasonable good.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01420760
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  • 3
    Electronic Resource
    Electronic Resource
    Nature and properties of humic acid prepared from different sources and its effect on nutrient availability (1985)
    Springer
    Plant and soil 88 (1985), S. 71-91 
    Details
    ISSN: 1573-5036
    Keywords: Black soil ; Extractant ; Humic substances ; Laterite Soil ; Metal-organic-complex ; Polymer ; Primary minerals ; Red Soil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Effect of sources, moisture levels and extractants on extraction, analytical properties, IR-spectra, macromolecular characteristics, interaction with cations and physiological properties of the extracted material (humic acid) were studied. Among the three variables, extractant influenced the degree of humification, IR-spectra, nature and properties of humic acids to a greater extent though the other two had significant contribution. Sodium pyrophosphate found to be an ideal extractant for humic acid. Reduced viscosity of humic acids increased with dilution particularly below 0.1 g/dl and decreased with increasing H+ concentration between pH 6.5 and 8.5 irrespective of source, moisture level and extractant. The amount of proton released and drop in initial pH of humic acids on addition of different metal ions indicated formation of mono-, di-hydroxy metal-HA complexes which broke down at pH 8.0 and above. HA-Fe2+ and HA-Cu2+ complexes were found to be most stable. Humic acids from different sources varied significantly in their effect on available nutrient status of soils though, the latter is main determining factor particularly for calcium and magnesium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02140667
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