DYNAMIC MECHANICAL PROPERTY PREDICTION BY GROUP INTERACTION MODELLING

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Authors
  1. Szabo, J.P.
  2. Davis, W.M.
  3. Petitpas, R.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Group Interaction Modelling (GIM) is a new procedure that relates the chemical structure of polymers to real-world observables. In this work, the equations specific to calculating the complex moduli of polymers were presented and implemented in MATLAB. GIM was used to calculate the mechanical moduli of several polymers and some differences were found when the results were compared to values presented in earlier work. Two problems with the GIM modelling of dynamic mechanical moduli were identified and explored. The first poroblem deals with the GIM variable tan Dg, which should be always a positive number, but in fact was found to be negative in some cases. The second problem identified was the behaviour of the modulus in the complex plane, which was not consistent with the behaviour of thermorheologically simple materials.
Keywords
Glass transition temperatures;Group Interaction Modelling;Polymer modelling;Group Contribution Analysis;Dynamic mechanical properties
Report Number
DREA-TM-98-219 — Technical Memorandum
Date of publication
01 Jul 1998
Number of Pages
26
DSTKIM No
99-00178
CANDIS No
510048
Format(s):
Hardcopy;Document Image stored on Optical Disk

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