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  • Polymer and Materials Science  (2)
  • Kinematic design  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Evaluation of kinetic parameters resulting from photostabilized degradation of poly(2,6-dimethyl-1,4-phenylene oxide) films in the absence and presence of zinc bis(O,O′-diisopropyldithiophosphate) (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 103-111 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Light scattering was used to evaluate the resulting changes in molecular weight, root-mean-square radius of gyration, degree of polymerization, number of chain scissions per single chain kngth, degree of degradation, specific rate constant, energy of activation, enthalpy, entropy and free energy of activation for the photo-oxidative degradation of poly(2,6-dimethyl-1,4-phenylene oxide) (poly(oxy-2,6-dimethyl-1,4-phenylene)) film, both in the presence and absence of 0,1 wt.-% zinc bis(O,O'-diisopropyldithiophosphate) (ZnDTP) as photostabilizer, undergoing random chain scission and crosslinking processes in the temperature range 313-363 K with light of wavelength 365 nm. The inhibitive action of ZnDTP was discussed from the viewpoint of the amount of gel fraction.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1984.021850111
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  • 2
    Electronic Resource
    Electronic Resource
    Photo-oxidative degradation and stabilization of isotactic poly(1-butene) in solid state, 1 (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 1637-1648 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The kinetics of photo-oxidative degradation and stabilization of poly(1-butene), [poly(1-ethylethylene), PB-1] at 253, 7 nm and a constant intensity of 2,38·10-9 Einstein.s-1·cm-2 (1,12·10-3 J·mol-1·s-1·cm-2) was studied in the absence and presence of 0,1 wt.-% 6-(2-hydroxyphenyl)-2,4-diphenyl-1,3,5-triazine (1) dispersed evenly in the matrix of polymer films in the temperature range of 267 to 313 K. The progress of the reaction was followed by measuring the rate of chain scission of the polymer. It has been confirmed by light scattering and potassium ferrioxalate actinometric measurements that random scission of the polymer chain occurs and 1 acts as a stabilizer to the photo-oxidative degradation processes. Irrespective of the variations in the values of ΔH≠ and ΔS≠ the values of ΔF≠ remain almost constant around 159 kJ·mol-1 indicating that the rate determining step is the same for both systems.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021810808
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  • 3
    Electronic Resource
    Electronic Resource
    Optimisation of a chair mechanism for partially disabled people for sitting-standing and sitting-lying motions (1979)
    Springer
    Medical & biological engineering & computing 17 (1979), S. 671-682 
    Details
    ISSN: 1741-0444
    Keywords: Kinematic design ; Patient chair
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract An unenergised aid to standing up, sitting down and lying down for partially disabled people has been optimised and a half size kinematic model made. Various facilities such as a foot rest, leg rest, arm rest and knee rest are also provided. The patient is lifted and placed in the desired standing and lying positions. An improved Rosenbrock optimisation technique using a penalty function approach is used to determine the optimum dimensions of the various links used in the chair mechanism. A general computer program has been developed to ascertain new dimensions of the mechanism for different input-output functional relationships.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02440915
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