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  • Key words Isotactic polyacrylonitrile  (2)
  • Canal polymerization  (1)
  • Progressive supranuclear palsy  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Computed tomographic findings in progressive supranuclear palsy (1987)
    Springer
    Neuroradiology 29 (1987), S. 168-171 
    Details
    ISSN: 1432-1920
    Keywords: Progressive supranuclear palsy ; Enlargement of ventricles ; CT scan findings ; Cortical dementia ; Subcortical dementia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary CT findings of 6 patients with progressive supranuclear palsy (PSP) are described, with emphasis on their supratentorial changes in comparison with those of control subjects and patients with Parkinson's disease (PD). As estimated from CT films, the lateral ventricles, third ventricle and prepontine cistern were significantly enlarged in PSP patients compared with both controls and PD patients. It is suggested that the patients with PSP have not only infratentorial but also supratentorial lesions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00327543
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Tacticity, molecular weight, and molecular-weight-distribution relationships in stereoregular polyacrylonitrile prepared by electron beam irradiation canal polymerization (2000)
    Springer
    Colloid & polymer science 278 (2000), S. 757-763 
    Details
    ISSN: 1435-1536
    Keywords: Key words Isotactic polyacrylonitrile ; Canal polymerization ; Electron beam irradiation ; Structure ; properties relationships
    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 preparation and characterization of stereoregular isotactic polyacrylonitrile (PAN) by electron beam (EB) irradiation on a urea canal complex are described. The EB method has several advantages over the ordinary γ-ray irradiation method: a very short polymerization time is needed (within a few seconds) and EB irradiation is carried out intermittently, and so all the polymer properties can be studied as a function of the EB irradiation dose. The structure–properties relationships of PAN, such as intrinsic viscosity versus the number-average molecular weight and the viscosity versus the isotacticity range were clarified. Significant information for the optimization of the tacticity of PAN was extracted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960000305
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A segment concept in the dissolution of stereoregular isotactic polyacrylonitrile into three dinitrile solvents, CN-(CH2) n -CN (n = 1, 2, and 3), at elevated temperatures (2000)
    Springer
    Colloid & polymer science 278 (2000), S. 352-357 
    Details
    ISSN: 1435-1536
    Keywords: Key words Isotactic polyacrylonitrile ; High-temperature dissolution ; Dinitrile solvents ; Segment mobility
    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 dependence of the dissolution temperature (T sol) of isotactic polyacrylonitrile (PAN) on tacticity was studied for three dinitrile solvents. A linear relationship was obtained in the inverse plots of the tacticity dependence of the T sol of PAN. A phenomenological analogy between the tacticity dependence of the T sol of isotactic PAN and the molecular-weight dependence of the glass-transition temperature of amorphous polystyrene is discussed from a thermodynamic point of view. The linear relationships in both phenomena are explained in terms of a common mechanism: a breakdown of thermodynamic competition, enthalpy, and entropy through the segment mobility. The significance of segment concept and molecular mobility at elevated temperatures are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050524
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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