Vibration damping materials, broad

Viscoelastic Properties of Acrylic Latex Interpenetrating Polymer Networks as Broad Temperature Span Vibration Damping Materials... 

The morphology of IPNs has been widely investigated via electron microscopy and dynamical mechanical spectroscopy. Many IPNs have dual-phase continuity, with phase domain sizes of the order of several hundred angstroms. For sound and vibration damping over broad temperature ranges, the two polymers are mixed in different extents in different parts of the material, usually in the submicron range. 

A sound and vibration damping material effective over a very broad temperature range with iso-E" is required. What kinds of morphologies might work best ... 

For many investigators in the sound and vibration damping field, interpenetrating polymer networks, or IPNs, are a new class of polymers capable of exhibiting relatively broad-band damping properties. The purpose of this chapter is to provide an introduction (1,2) to these materials, what they are, how they are made, the kind of morphologies that may be expected, and why they have the properties they have. 

Using a computerized data reduction scheme that incorporates a generalized WLF equation, dynamic mechanical data for two different polymers were correlated on master curves. The data then were related to the vibration damping behavior of each material over a broad range of frequencies and temperatures. The master curves are represented on a novel reduced temperature nomograph which presents the storage modulus and loss tangent plots simultaneously as functions of frequency and temperature. ... 

L. H. Sperling, T.-W. Chiu, R. G. Gramlich, and D. A. Thomas, Latex IPN Coating System for Damping Noise and Vibrations over a Broad Temperature Range, U.S. Nat. Tech. Inform. Serv., Ad Rep. No. 765511/1. Latex IPNs as damping materials. 

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