Characterization of Poly(ether)urethanes - High Resolution Thermogravimetric Analysis

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Authors
  1. Hiltz, J.A.
  2. Keough, I.A.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Abstract
High resolution dynamic mode and stepwise isothermal mode thermogravimetric analysis (TGA) has been used to study the thermal degradation of six thermoplastic poly(ether)urethanes. Poly(ether)urethanes are block copolymers consisting of diisocyanate rich hard segments and poly(ether glycol) rich soft segments. In general, the hardness of these polymers increases with an increase in the percent hard segment in the polymer. The literature indicates that these polymers degrade by a two step mechanism; the diisocyanate rich hard segments in the first step and the poly(ether glycol) rich soft segments in the second step. The results of the dynamic mode analysis indicated that in general the temperature of the maximum rate of weight loss for the first step (T sub 1Max) decreased as the Shore D hardness of the polymers increased while the temperature of the maximum rate of weight loss for the second step (T sub 2Max) increased as the Shore D hardness of the polymer increased. However, a plot of T1 sub Max against sample Shore D hardness showed considerable scatter. Better correlations were observed when data for the elastomers from a particular manufacturer were considered separately. This suggested that the technique could be sensitive to differences in the morphology of the polymers arising from the synthetic procedure used to prepare them. The results of the stepwise isothermal mode analysis indicated that the weight losses attributed to the degradation of the hard and soft segme

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Keywords
Poly(ether)urethanes;Thermoplastic polyurethanes;Characterization;Thermogravimetric analysis;High resolution thermogravimetric analysis;High resolution dynamic mode
Report Number
DRDC-ATLANTIC-TM-2004-023 — Technical Memorandum
Date of publication
01 Feb 2004
Number of Pages
34
DSTKIM No
CA024962
CANDIS No
522464
Format(s):
CD ROM

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