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

Report Date:

1996-07-15

Pagination or Media Count:

47.0

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 copolymers, with poly- dispersity approaching the theoretical polydispersity and with functional groups in alpha, omega-positions by radical copolymerization of radically polymerizable monomers, 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..

Subject Categories:

  • Polymer Chemistry
  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE