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  • 1
    Publication Date: 2004-12-03
    Description: Empirical magnetic field models are discussed in terms of using models in multi-instrument data analysis. The variety of previous applications of field models are demonstrated. The problems found by using data based models are addressed and the prospects of their future development are outlined. Some issues related to time-dependency of the field configuration are presented.
    Keywords: Astrophysics
    Type: ; 293-317
    Format: text
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  • 2
    ISSN: 1573-9171
    Keywords: synthesis ; crystal structure ; azepinethiones ; trimethylsilyl derivative
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The title compounds were prepared and X-ray analysis was performed (R = 0.064 and 0.035 for 1309 and 1637 reflections, respectively). In the former the intramolecular S→Si coordination interactions are absent and the Si atom has undistorted tetrahedral coordination with an S...Si distance of 4.034 Å. Crystals of the latter are built of centrosymmetric dimeric H-complexes (S...H(N) 2.58 Å, the S...HN angle 168°).
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-9171
    Keywords: synthesis ; crystal structure ; pentacoordinated silicon ; chelate cycle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The X-ray diffraction structural study of the (N-Si)-chelate of 2-(chlorodimethyl-silylmethylthio)-1-pyrroline was carried out (R = 0.033 for 1894 reflections). The Si atom has a somewhat distorted trigonal bipyramidal coordination with the Cl and N atoms in axial positions. The Si-Cl and Si-N distances (2.423(1) and 1.945(1) Å) belong, respectively, to the longest and shortest known Si-Cl and Si-N distances in pentacoordinated silicon derivatives with an axial N-Si-Cl moiety.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 26 (1988), S. 1125-1141 
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Different synthetic approaches have been used for preparing some new polymers relating to sulphur-containing polyarylenequinodiimides. The latter have been obtained both from quinodi-imidedichloride and aromatic dithioles and directly from 1,4-phenylenediamine and disulphenylchlorides. The mechanism of this process has been proposed on the basis of studying a model reaction of phenylsulphenylchloride with 1,4-phenylenediamine. Polyarylenesulphonequinodi-imides have been obtained by selective oxidation of polyarylenesulphoneamides with phenyliodozoacetate. Their structure has been proved by IR, PMR, and 13C-NMR spectroscopies. Electrophysical properties of synthesized polymers have been studied.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 40 (1990), S. 1095-1114 
    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: Ethylene polymerization on chalk surface under the action of TiCl4-organoaluminium compound systems yields filled composites possessing high stress-strain properties and preserving their ductility up to the chalk content of 60-70 wt %. The kinetics of the process and the properties of the composites have been investigated, as well as the interrelation between catalyst fixation technique, polymerization rate, and the ductile properties of composites containing 50 wt % of chalk. The conditions leading to the formation of “homogeneous” composites with a high ductility are examined. The possible causes of the formation of composites with a low value of elongation at break are analyzed. The principal regularities of the mechanical behavior of composites are considered for the case when the process is taking place on the filler surface and leads to “homogeneous” composites.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 647-653 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurde die Bilding von Polyarylensulfiden bei der Polykondensation polyhalogenaromatischer Verbindungen mit Natriumsulfid untersucht, um die Hauptgesezmäßigkeiten dieser Reaktion aufzuklären. Ferner wurden die wege zur Regulierung der physikalischen Eigenschaften der schwefelhaltigen Polyarylene mittels chemischer Modifikation der Polymerketten durch Einflührung von Sulfonbrückenbindungen, reaktionsfähigen Amino-, Cyano- und Malenimid-gruppen sowie metallorganischen Fragmenten erörtert.
    Notes: The formation of polyarylene sulfides by polycondensation of polyhalogenoaromatic compounds with sodium sulfide was investigated in order to elucidate the basic relationsships of this reaction. Further, approaches to controlling the physical properties of sulfur-containing polyarylenes by chemical modification of the polymer chain, such as introducing sulfone bridges, reactive amino, cyano and maleimide groups and metalorganic substituents, are discussed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The thermal stabilities of N,N′-(4,4′-diphenylmethane)bismaleimide and N,N′-(4,4′-diphenylsulfide)bismaleimide, of the respective homopolymers, and of high molecular weight linear poly(aminoimide) and poly(sulfideimide) have been investigated. The homopolymers of the two bismaleimides are thermally more stable than the initial bismaleimides. The linear poly(aminoimide) and poly(sulfideimide) are thermally less stable than the bismaleimides and the homopolymers. Poly(aminoimide) shows less thermostability as compared to poly(sulfideimide), probably due to ringopening of the succinimide rings in poly(aminoimide) by secondary bridge aminogroups.
    Notes: Die thermische Beständigkeit von N,N′-(4,4′-Diphenylmethan)bismaleinsäureimid und N,N′-(4,4′-Diphenylsulfid)-bismaleinsäureimid, der Homopolymere aus diesen beiden Verbindungen und hochmolekularer linearer Polyaminoimide und Polysulfidimide wurde untersucht. Die Homopolymere beider Bismaleinsäureimide sind thermisch beständiger als die Ausgangs-Bismaleinsäureimide. Die linearen Polyaminoimide und Polysulfidimide weisen eine geringere thermische Beständigkeit als die Bismaleinsäureimide und ihre Homopolymere auf. Die thermische Beständigkeit des Polyaminoimids ist wahrscheinlich als Folge einer Ringöffnung der Succinimidringe im Polyaminoimid durch sekundäre Aminobrückenbindungen geringer als die des Polysulfidimids.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 389-393 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die chemische Modifizierung wird als aussichtsreiche Methode zur Synthese organometallischer Polymere diskutiert. Hochmolekulare Verbindungen mit Benzenringen werden als Makroliganden eingesetzt, um makromolekulare Übergangsmetall-π-Komplexe zu synthetisieren.
    Notes: Chemical modification as a prespective method for synthesizing organometallic polymers is discussed. High-molecular compounds with benzene rings are used as macroligands to synthesize macromolecular transition metal π-complexes.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 35 (1984), S. 286-290 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Neue thermostabile Polymere der allgemeinen Formel [—Ar—X—Ar—S—Me—S—] mit X = O, S oder direkter C—C-Bindung und Me = Pb oder Cd wurden dargestellt. Ihre Eigenschaften sowie ihr thermischer Abbau unter Interbedingungen und in Luft wurden untersucht. Die wichtigsten Thermolyseprodukte sowie die Aktivierungsenergie der Bildung der gasförmigen Produkte wurden bestimmt.
    Notes: New thermostable polymers of the general formula [—Ar—X—Ar—S—Me—S—], where X is O, S or C—C bond, and Me is Pb or Cd, were prepared. Properties and thermal degradation of these polymers in an inert medium and in air have been investigated. Main products of degradation were determined and the activation energy of the reaction leading to gaseous products were determined.
    Additional Material: 5 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 11 (1973), S. 583-587 
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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