Dynamic Mechanical Property Prediction by Group Contribution Analysis


  1. Szabo, J.P.
  2. Roberts, J.C.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Vibroacoustic materials play a key role in signature control of military platforms, and their performance is related to the frequency dependence of the modulus and loss factor of the polymers from which they are fabricated. The height, wdith, and position (fmax) of the loss factor peak varies from polymer to polymer, as does the rubbery and glassy plateau moduli. This paper presents work in progress on a TTCP operating assignment whose goal is to extend and validate models which relate a polymer's dynamic mechanical properties to its chemical structure. The complex modulus of polymeric materails may be described by the Havriliak-Negami (HN) equation. Group contribution analysis (GCA) was used to derive contributions to the five parameters of the HN equation for a set of polyurethanes. Use of the calculated contributions gave HN parameters which show good agreement with experimental values when used on the training set, but had high error when tested on other polymers. Redefining the groups used for GCA show significantly improved results. The use of a new training set of polymers and the use of different structure descriptors is also discussed.
GCA (Group Contribution Analysis);Vibroacoustic materials
Report Number
DREA-SR-1999-162-PAP-30 — CONTAINED IN CA000150
Date of publication
01 Oct 1999
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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