Synthesis and characterization of a series of thermoplastic polyurethanes

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Authors
  1. Szabo, J.P.
  2. Cook, D.
  3. Hackett, J.
  4. Keough, L.A.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
The use of Group Contribution Analysis (GCA) and Group Interaction Modelling (GIM) to model the dynamic mechanical properties of polymers is the subject of an ongoing TTCP (The Technical Cooperation Panel) study. This paper describes the synthesis of 20 phase mixed thermoplastic polyurethanes for the TTCP modelling study, and the characterization of these polymers by dynamic mechanical thermal analysis (DMTA). The polyurethane formulations were synthesized from 4,4'-methylenebis(phenyl isocyanate) or 1,6-diisocyanatohexane, and glycol, polgylcol, or glycol/polyglycol mixtures. The standard "one-shot" batch reaction method was initially tried for several of the formulations, but a number of problems were identified. These included bubble formation in the samples, high exotherms, and fast reaction times. As a result, a solution polymerization/solution casting method was developed, using N,N-dimethylformamide as a solvent. This approach has several advantages including control of the reaction temperature and rate and the absence of bubble formation in the samples. All 20 of the formulations were successfully prepared in solution, and 15 of the formulations were successfully solvent cast into 1 mm thick film samples for DMTA testing. TRUNCATED
Keywords
Polymer modelling;Dynamic mechanical properties;Group Interaction Modelling;Group Contribution Analysis
Report Number
DREA-SR-2001-094-SES-VIII-PAP-39 — Special Report
Date of publication
01 Oct 2001
Number of Pages
12
DSTKIM No
CA011876
CANDIS No
516454
Format(s):
Hardcopy;Document Image stored on Optical Disk

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