glass transition sorption and swelling the g d and nelf approaches
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Glass Transition, Sorption and Swelling: The G-D and NELF approaches. Costas Panayiotou University of Thessaloniki, Greece. The salient features of the development:. The glass transition and glass densification. The Gibbs-DiMarzio + EOS approach. The NELF approach. The Glass – Transition I.

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glass transition sorption and swelling the g d and nelf approaches

Glass Transition, Sorption and Swelling:The G-D and NELF approaches

Costas Panayiotou

University of Thessaloniki, Greece

slide2

The salient features of the development:

The glass transition and glass densification

The Gibbs-DiMarzio + EOS approach

The NELF approach

effect of pressure on tg
Effect of pressure on Tg
  • The pressure increases the Tg of pure polymers
  • The presence of a solvent decreases the Tg of the polymer (plasticization)
  • What will happen when a SCF is interacting with a polymer at high pressures?
slide7

Plasticization of glassy polymers:

Retrograde vitrification

slide8

Handling the Glassy State with EOS

  • Density: An order parameter for the non-equilibrium glassy state. Thus:

(Macromolecules 1998, 31, 7915; IEC Res. 2004, 43, 6841)

  • The Gibbs-DiMarzio criterion:

S 0 at Tg

slide9

Handling the Glassy State with EOS

The Gibbs-DiMarzio Approach

  • The Gibbs-DiMarzio criterion:
  • The key LF equations:

S 0 at Tg

slide10

Handling the Glassy State with EOS

The Gibbs-DiMarzio Approach

  • The Gibbs-DiMarzio criterion:
  • Calculation of entropy:

S 0 at Tg

slide11

Handling the Glassy State with EOS

The Gibbs-DiMarzio Approach

slide12

Handling the Glassy State with EOS

The Gibbs-DiMarzio Approach

slide13

Handling the Glassy State with EOS

The Gibbs-DiMarzio Approach

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