Abstract
A rule-of-mixtures approach is used with dynamic mechanical analysis (DMA) to determine the viscoelastic characteristics of individual layers of a fourth-generation advanced magnetic tape used for archival storage. Such tapes are comprised of three layers: a 0.92 µm thick poly(ester-urethane)-based front coat that binds the magnetic particles together, a 5.00 µm thick poly(ethylene naphthalate) substrate, and a protective 0.64 µm thick back coat with cellulose nitrate as a constituent. The storage modulus, loss modulus, and loss tangent determined for each layer are discussed in terms of their influence on magnetic tape properties and characteristics.
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