Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1980-1984  (3)
  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 991-1003 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A mixture, probably composed of a poly(chlorotrimethylsilyloxy)phosphazene and a compound with the general formula H2Cl2NOP (inactive toward THF) was used to initiate the polymerization of tetrahydrofuran. The resulting polymer (PTHFP) contains phosphorus associated with nitrogen, as assessed by IR, 31P and 1H NMR spectroscopy. The thermal stability of PTHFP, observed by thermogravimetry, was found to be much higher than that of polytetrahydrofuran (PTHF). At the end of its decomposition a solid residue remains, which was identified as a poly(phosphazene oxide) (PNO)n. The combustion behaviour is also modified in that the cool flame combustion area is raised up in the pressure-temperature coordinates. In addition, the disappearance of the so-called secondary cool flame (SCF) phenomenon is in favour of the heterogeneous action of the phosphorus derivatives during the inhibition of combustion at higher temperatures. The thermochemical analysis (DSC-Rheovibron) shows the existence of a semi-cristalline structure proportional to the amount of phosphorus introduced into the PTHF chain. The glass transition temperature of PTHFP was found to be slightly higher than that of PTHF without any apparent relation to their structures. The same conclusion arises from the viscoelastic measurements.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 183 (1982), S. 1137-1143 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polychlorophosphazenes 2 can easily be obtained by thermal condensation of dichlorophosphinoyliminotrichlorophosphorane (1) under atmospheric pressure at 240-290°C, pure POCl3 being eliminated. The different stages of the reaction were studied by chemical analysis, 31P NMR, IR spectroscopy, and thin layer chromatography. The procedure enables one to obtain polymers of low and high molecular weights. The samples do not contain any cyclic or reticular polymers. Species of low molecular weights can be separated from those with high molecular weights by treatment with heptane. The total yield of phosphorus is 100% with regard to the starting material. Substitution products (Cl by OCH2CF3) are obtained which are identical with those obtained with the polychlorophosphazenes prepared via classical methods.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 511 (1984), S. 212-218 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaktion zwischen Bis(dichlorophosphoryl)imid und HexamethyldisilazanBei der Reaktion zwischen Bis(dichlorophosphoryl)imid und Hexamethyldisilazan - mit oder ohne Lösungsmittel - wurden zwei Phasen erhalten.Die feste Phase ist das Ammoniumsalz des Bis(dichlorophosphoryl)imids, das auch wie manche Metallsalze desselben Typus durch die allgemeine Reaktion \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm Cl}_2 {\rm - P(O) - N = PCl}_{\rm 3} + {\rm AO}_{\rm n} ^{\rm - } {\rm M}^{\rm + } \to {\rm MN(P(O)Cl}_{\rm 2})_2 + {\rm AO}_{{\rm n - 1}} {\rm Cl} $$\end{document} erhalten werden kann. Dieses Salz wird durch IR, 31P-, 1H- und 14N-NMR sowie die Hydrolyse charakterisiert.Die Zusammensetzung der flüssigen Phase ändert sich je nach den experimentellen Bedingungen. Die ersten Hauptprodukte sind offenbar Cl2(O)P—N=P(OSiMe3)Cl2 und Cl2(OSiMe3)P=N—PCl(OH)NSiMe3. Diese Verbindungen kondensieren dann weiter zu Hochpolymeren.
    Notes: By reaction between bis(dichlorophosphoryl)imide and hexamethyldisilazane - with or without solvent - the authors obtain two phases.The solid phase is the ammonium salt of the bis(dichlorophosphoryl)imide which can be obtained, like many other metallic salts of this type, by the general reaction: \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm Cl}_2 {\rm P(O) - N = PCl}_{\rm 3} + {\rm AO}_{\rm n} ^{\rm - } {\rm M}^{\rm + } \to {\rm MN(P(O)Cl}_{\rm 2})_2 + {\rm AO}_{{\rm n - 1}} {\rm Cl} $$\end{document}.The salt is characterized by its I.R., and 31P, 1H, and 14N N.M.R. spectra and by its hydrolysis reaction.The composition of the liquid phase changes according the experimental conditions. It seems that at first the main components are Cl2(O)P—N=P(OSiMe3)Cl2 and Cl2(Me3SiO)P=N—PCl(OH)NSiMe3. These compounds condense further to high polymers.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...