Accession Number : ADA324659

Title :   Isodisperse Telechelic Polymers and their Polyurethane Derivatives.

Descriptive Note : Final rept. Jan 95-Jun 96,

Corporate Author : MAGYAR TUDOMANYOS AKADEMIA KOZPONTI KEMIAI KUTATO INTEZET BUDAPEST

Personal Author(s) : Tuedoes, Ferenc ; Foeldes-Beerezsnich, Tamara

PDF Url : ADA324659

Report Date : 15 JUL 1996

Pagination or Media Count : 47

Abstract : This report describes the so-called 'isodisperse telechelic polymerization' method for the preparation of hydroxy-terminated polybutadienes (HTPBD). From these polymer diols polyurethane can be produced. This method relates to a process for preparihg (co)polymers, with poly- dispersity approaching the theoretical polydispersity and with functional groups in alpha, omega-positions by radical (co)polymerization of radically polymerizable monomer(s), using one or more initiators. The isodisperse polymerization can be approximately realized by isothermal polymerization but with very rigid polymerization regime. The exact isodisperse polymerization regime can be realized under nonisothermal conditions. For the practical realization of the method, the degree of polymerization is regulated by the continuous elevation of the temperature according to a temperature program' determined by a function describing the variation of the polymerization process against time with the aid of independent variables affecting the process (concentrations, initial temperature, etc.).

Descriptors :   *POLYMERS, *POLYURETHANE RESINS, THERMAL PROPERTIES, TEMPERATURE, PREPARATION, POLYMERIZATION, MONOMERS, ELEVATION, RIGIDITY, ISOTHERMS, HYDROXYL RADICALS, GLYCOLS, HYDROXY TERMINATED POLYBUTADIENE, UNITED KINGDOM.

Subject Categories : Polymer Chemistry
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE