13C Solution NMR Spectra of Poly(ether)urethanes

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Authors
  1. Hiltz, J.A.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Abstract
The 13C solution nuclear magnetic resonance (NMR) spectra of the 15 poly(ether)urethanes are presented. The poly(urethane)s were prepared using one of two diisocyanates, either methylene diphenyl diisocyanate (MDI) or hexamethylene diisocyanate (HDI), one of five poly(ether glycol)s, poly(tetramethylene ether glycol) of molecular weight 650, 1000, or 1400, or poly(ethylene glycol) of molecular weight 600 or 1000, and one of three chain extenders, ,4-butanediol, 2,2-dimethyl-1,3-propanediol, or diethylene glycol. These polymers were prepared as part of a modelling study to determine if Group Contribution Theory and Group Interaction Modelling could be used to predict dynamic mechanical properties of poly(ether)urethanes on the basis of the structural fragments in the polymers. The chemical shifts of the unique carbons in each of the poly(urethane)s are assigned. They can be used to unambiguously identify the diisocyanate/diol/poly(ether glycol) used to prepare the various polyurethanes. For some compounds the spectra show resonances for terminal hydroxyl substituted carbons. These could provide a method, under the right experimental conditions, to compare molecular weights of batches of the same polymer.

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Keywords
1,4-butanediol;13C NMR;4,4'-methylene bis-(phenyl isocyanate);Poly(ether)urethanes;Poly(tetramethlyene ether glycol);Diethylene glycol;2,2-dimethyl-1,3-propanediol (DMPD);Chemical shifts;1,6-diisocyanatohexane (HDI)
Report Number
DRDC-ATLANTIC-TM-2002-146 — Technical Memorandum
Date of publication
01 Nov 2002
Number of Pages
46
DSTKIM No
CA022104
CANDIS No
518928
Format(s):
CD ROM

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