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Chapter 38 – SANS FROM POLYMER BLENDS . 38:1. THE FLORY-HUGGINS MODEL. 38:2. BINODAL AND SPINODAL LINES. 38:3. THE RANDOM PHASE APPROXIMATION. 38:6. GIBBS FREE ENERGY DENSITY AND PHASE DIAGRAM. Polymer Blend. 38:1. THE FLORY-HUGGINS MODEL. Gibbs free energy density:. Scattering factor:.

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Chapter 38 – SANS FROM POLYMER BLENDS

38:1. THE FLORY-HUGGINS MODEL

38:2. BINODAL AND SPINODAL LINES

38:3. THE RANDOM PHASE APPROXIMATION

38:6. GIBBS FREE ENERGY DENSITY AND PHASE DIAGRAM

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Polymer

Blend

38:1. THE FLORY-HUGGINS MODEL

Gibbs free energy density:

Scattering factor:

38:2. BINODAL AND SPINODAL LINES

Chemical potential:

Osmotic pressure:

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38:3. THE RANDOM PHASE APPROXIMATION

Recall:

Single-chain form factor:

Cross section:

38:6. GIBBS FREE ENERGY DENSITY AND PHASE DIAGRAM

Spinodal condition:

Binodal condition:

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GIBBS FREE ENERGY

PHASE DIAGRAM

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COMMENTS

-- The Flory-Huggins model describes the phase behavior for polymer blends. It can predict the spinodal temperature.

-- The Gibbs free energy density has two contributions: entropic and enthalpic.

-- The Random Phase Approximation model is used to fit SANS data in the homogeneous (single-phase) region.

-- Flory-Huggins interaction parameters can be measured.