Accession Number : ADA137542

Title :   Properties of Multiphase Polyurethane Systems.

Descriptive Note : Final rept. 1 Jul 82-30 Jun 83,


Personal Author(s) : Cooper,S L

PDF Url : ADA137542

Report Date : Jul 1983

Pagination or Media Count : 25

Abstract : The incorporation of urea linkages in the polyurethane hard segment has a profound effect on the phase separation and domain structure of polyether polyurethaneureas (PEUU's). This is due to the high polarity difference between the hard and soft segments and the likely development of a three dimensional hydrogen bonding network. A new series of PEUU's was synthesized from 4,4'-diphenyl methane diisocyanate, ethylene diamine and poly(tetramethylene oxide) (PTMO). The molar ratios of the reactants and the soft segment (PTMO) molecular weight were varied to produce samples of varying hard segment content and block length. Previously (1981-82) we reported results of thermal, dynamic mechanical and tensile experiments on these materials. In the past year we have continued our investigation of these materials using IR spectroscopy.

Descriptors :   *Polyurethane resins, Polyethers, Urea, Molecular structure, Mechanical properties, Linkages, Phase, Separation, Polarity, Hydrogen bonds, Three dimensional, Synthesis, Morphology, Carbonyl compounds, Chemical radicals, Interfaces, Stress strain relations, Polymers, Polymerization, Hydrolysis, Stability, Permeability, Tensile properties, Ionomers, Transition temperature, Infrared spectroscopy

Subject Categories : Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE