Chapter 15.2

Chapter 15.2 - Viscoelasticity (I) Amorphous polymer: glass...

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Viscoelasticity (I) ¾ Amorphous polymer: glass at low temperatures, rubber at intermediate temperatures, viscous liquid at high T. ¾ Low temperatures : elastic deformation at small strains ( σ = E ε ). Deformation is instantaneous when load is applied. Deformation is reversible. ¾ High temperatures : viscous behavior. Deformation is time dependent and not reversible. ¾ Intermediate temperatures : viscoelastic behavior. Instantaneous elastic strain followed by viscous time dependent strain. ¾ Viscoelastic behavior is determined by rate of strain (elastic for rapidly applied stress, viscous for slowly applied stress) Rate dependence of viscoelastic properties in a silicone polymer (Silly Putty). Picture by Geon Corp.
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8 MSE 2090: Introduction to Materials Science Chapter 15, Processing of Polymers Viscoelasticity (II) Load is applied at t a and released at t r Elastic Viscous Viscoelastic
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9 MSE 2090: Introduction to Materials Science Chapter 15, Processing of Polymers Viscoelasticity (III)
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Chapter 15.2 - Viscoelasticity (I) Amorphous polymer: glass...

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