Phase mixed polyurethane synthesis

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Authors
  1. Cook, D.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Bodycote Ortech Lab, Mississauga ONT (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 report describes the synthesis of 20 phase mixed thermoplastic polyurethanes that will be characterized and modelled by GCA and GIM. 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;GCA (Group Contribution Analysis);Group Interaction Modelling;Characterization;Dynamic mechanical properties
Report Number
DREA-CR-2000-076 — Contractor Report
Date of publication
01 Jul 2000
Number of Pages
35
DSTKIM No
CA010940
CANDIS No
515066
Format(s):
Hardcopy;Document Image stored on Optical Disk

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