Abstract
Glassy polymers are normally classed as amorphous and brittle. However, classifying polymers is very much a time dependent concept where a short experimental time period produces brittleness but an extended time-scale can result in viscous flow. An example of the time dependent behaviour of polymers is the material known as “bouncing putty” which flows like a viscous liquid if left under its own weight for extended periods, but shatters like a glass when hit with a hammer. Temperature is another factor which determines whether a polymer is a glassy solid, an elastic rubber or a viscous liquid. Measurements at low temperatures or high frequencies show glassy responses for polymers with Young’s modulus values in the range 1–10 GPa and small strains at break. At high temperatures or low frequencies the polymer may well produce a large extension without permanent deformation with a reduced modulus in the range 1–10 MPa, thus showing a rubber-like response. The polymer finally acts as a viscous liquid at even higher temperatures where permanent deformation occurs under applied stress.
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Clarke, R.L. (1997). Glassy Polymers. In: Polymeric Dental Materials. Macromolecular Systems — Materials Approach. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-60537-6_2
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DOI: https://doi.org/10.1007/978-3-642-60537-6_2
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