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
  • 1
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Durch Phasengrenzflächenpolykondensation von Bis(4-mercaptomethylphenyl)-methan mit ausgewählten aliphatischen und isomeren Phthalsäuredichloriden wurden neue Polythioester erhalten.Um die optimalen Bedingungen der Phasengrenzflächenpolykondensation zu bestimmen, wurde der Einfluß folgender Faktoren auf die reduzierte Viskosität und die Ausbeute der Polythioester ermittelt: Art der organischen Phase, Konzentration der Reagenzien, Verhältnis der wäßrigen zur organischen Phase, Art und Konzentration des HCl-Akzeptors, Reaktionstemperatur und -zeit.Die Polykondensation von Dithiol mit Adipinsäuredichlorid und Isophthalsäuredichlorid wurde als Modellsystem genauer untersucht. Die Polythioesterstrukturen wurden mittels Elementaranalyse, IR-Spektroskopie und Röntgenstrukturanalyse bestätigt. Es wurden weiterhin einige physikalisch-chemische, mechanische und dielektrische Eigenschaften ermittelt. Aufgrund der schlechten Löslichkeit der Polythioester konnten die mittleren Molekulargewichte nicht bestimmt werden.
    Notes: New polythioesters were synthesized by interfacial polycondensation of bis(4-mercaptomethylphenyl)methane with selected aliphatic and isomeric phthaloyl dichlorides. To determine optimum polycondensation conditions, the influence of the following factors on reduced viscosity and yield were studied: type of organic phase, concentration of hydrogen chloride acceptor (NaOH), concentration of reagents, aqueous/organic phase ratio, rate of acid chloride addition, reaction time and reaction temperature.A thorough examination was carried out only for the polycondensation of dithiol with adipoyl and isophthaloyl dichlorides chosen as model systems. The structures of polythioesters were confirmed by elemental analysis, X-ray analysis and infrared spectroscopy. Some physicochemical, mechanical and electrical properties were determined. The molecular weights were not measured, because of the low solubility of the obtained polythioesters.
    Additional Material: 10 Tab.
    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, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 34 (1987), S. 639-650 
    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: Aromatic (poly)cycloaliphatic polysulfonates of high molecular weight can be easily obtained by interfacial polycondensation of aromatic (poly)cycloaliphatic diphenols with aromatic disulfonyl chlorides. The polysulfonates were found to have a low degree of crystallinity, softening ranges in the region 180-310°C and molecular weights in the region: M̄n 3190-4420, and M̄w 19900-83370, thermal stability to above 300°C, and reduced viscosities in the range 0.2-1.00 dL/g.
    Additional Material: 5 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...