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Degradation behaviour of polyurethane studied by linear temperature programmed pyrolysis FTIR spectroscopy
Author(s) -
Herzog Klaus
Publication year - 1991
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19910520132
Subject(s) - polyurethane , isocyanate , pyrolysis , polyester , fourier transform infrared spectroscopy , materials science , infrared spectroscopy , evaporation , adipic acid , degradation (telecommunications) , polymer chemistry , chemical engineering , chemistry , organic chemistry , composite material , physics , thermodynamics , engineering , telecommunications , computer science
FTIR spectrometers with two measurement beams offer the possibility to record and process spectra from 4000 to 400 cm −1 taken every 30 seconds in situ from a polyurethane film which is subjected to a programmed linear rise of temperature from ambient to 400°C and to take quasi simultaneously the spectra of the gaseous pyrolysis products. As an example, polyurethane (PUR) prepared from diphenylmethane diisocyanate (MDI) with polyesteralcohol from adipic acid was thermally degraded to isocyanate and polyester alcohol. Carbodiimid was found in the pyrolysis products and carbon dioxide was detected in the pyrolysis gas. The isocyanate evaporation and the thermal degradation of polyester alcohol were studied.