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Proceedings Paper

Structure-property relationships in viscoelastic behavior of interpenetrating polymer networks for constrained-layer damping
Author(s): Rodger N. Capps; Christopher S. Coughlin; Mary Q. Samuels
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Paper Abstract

Interpenetrating polymer networks (IPNs) are materials composed of two or more crosslinked polymers permanently and intimately intertwined on a molecular level. The resulting distribution of microenvironments can result in a material with a high mechanical loss in the glass-rubber relaxation, that is shifted in temperature and broadened over that of either constituent polymer. Several series of polyurethane/epoxy IPNs have been prepared for evaluation as possible broad band damping materials. Dynamic mechanical analysis and differential scanning calorimetry revealed that the temperature of the loss peak could be varied widely with sample formulation. Flexible epoxy components and plasticizers were incorporated. This resulted in materials with relatively low Young's and shear moduli, with losses that were broadened in the temperature regime. Simply supported beam assemblies were used to measure damping of three layer constrained structures. Comparison of measured temperature and frequency dependent viscoelastic behavior in constrained layer structures is analyzed in terms of the Ross-Kerwin-Ungar model for coated beams, and correlated to polymer composition and morphology.

Paper Details

Date Published: 1 May 1994
PDF: 9 pages
Proc. SPIE 2193, Smart Structures and Materials 1994: Passive Damping, (1 May 1994); doi: 10.1117/12.174101
Show Author Affiliations
Rodger N. Capps, Naval Research Lab. (United States)
Christopher S. Coughlin, Naval Research Lab. (United States)
Mary Q. Samuels, Naval Research Lab. (United States)


Published in SPIE Proceedings Vol. 2193:
Smart Structures and Materials 1994: Passive Damping
Conor D. Johnson, Editor(s)

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