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  • 2000-2004  (1)
  • 1995-1999  (1)
  • 1970-1974  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Demonstration of a biogenetically unprecedented side chain in the marine sterol, gorgosterol (1970)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 92 (1970), S. 2179-2180 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00710a089
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Rheological study of biodegradable blends of starch and polyvinyl alcohol (1995)
    Springer
    Journal of polymers and the environment 3 (1995), S. 161-167 
    Details
    ISSN: 1572-8900
    Keywords: Corn starch ; polyvinyl alcohol ; biodegradable blends ; rheology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The rheological behavior of biodegradable blends of starch and poly(vinyl alcohol) (PVOH) was measured as a function of temperature, shear rate, and moisture content using a capillary rheometer. An excellent correlation was found with a rheological model which was used as a means to characterize the influence of starch/PVOH content as well as a qualification of the viscosity for simulation studies. This model consisted of a power law dependence on shear rate, an Arrhenius dependence on temperature, and an exponential dependence on moisture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02068467
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Hydrolytic degradation of PCL/PEO copolymers in alkaline media (2000)
    Springer
    Journal of materials science 11 (2000), S. 227-233 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract PCL/PEO copolymers with different compositions were obtained from ring opening polymerization of ε-caprolactone in the presence of ethylene oxide and characterized by various analytical techniques. Data collected from DSC and X-ray diffractometry suggested that the copolymer chains possess a blocky structure, leading to both PCL and PEO-type crystalline structures. Hydrolytic degradation of these copolymers was carried out in a pH=10.6 carbonate buffer solution at 37 °C. Comparison was made with a PCL homopolymer and a PCL/PEG blend which had the same gross composition as one of the copolymers. The results showed that the presence of PEO sequences considerably enhanced the hydrophilicity of the copolymers as compared with PCL homopolymer. Nevertheless, the degradability of PCL chains was not enhanced due to the phase separation between the two components. These materials should be of great interest for biomedical uses such as matrices for sustained drug delivery because of the presence of both hydrophilic and hydrophobic microdomains. ©2000 Kluwer Academic Publishers
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008920326988
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    Paper (German National Licenses)
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