DSC/DMA study of poly(ether)urethane thermoplastic elastomers

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Authors
  1. Hiltz, J.A.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Poly(ether)urethane thermoplastic elastomers are being considered for use by the Canadian Forces in several applications where their chemical resistance, processibility, and range of temperature and frequency depenent properties lead to reduced costs and improved performance. Poly(ether)urethanes are linear segmented copolymers consisting of urethane rich hard segments and polyrol rich soft segments. Incompatibility of the hard and soft segments leads to the formation of hard segment and soft segment domains within the polymer. The degree of phase separation/mixing depends on a number of factors including the structure of the diisocyanate, polyol, and chain extender used to prepare the urethane, the molecular weight of the polyol, the relative proportions of diisocyanate, polyol and chain extender, thermal history and how the elastomer was synthesized. More importantly, the degree of phase mixing affects the properties of the material. In this paper the results of differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) studies of five commerical 4,4'-diphenylmethane diisocyanate/poly(tetramethylene oxide)/1,4-butanediol based poly(ether)urethanes are reported. The results indicate that poly(ether)urethanes with similar compositions have very different levels of phase separation/mixing. TRUNCATED
Keywords
Characterization;Differential Scanning Calorimetry;Dynamic Mechanical Analysis;Infrared spectrometry;Poly(ether)urethanes;MDI;Pol(oxytetrameylene);Thermal properties;Thermoplastic elastomers
Report Number
DREA-SL-2000-068 — Paper
Date of publication
30 May 2000
Number of Pages
20
Reprinted from
Canadian Thermal Analysis Society, 1999, p 134-149
DSTKIM No
CA010567
CANDIS No
515355
Format(s):
Hardcopy;Document Image stored on Optical Disk

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