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Chapter 38 – SANS FROM POLYMER BLENDS

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

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  1. 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

  2. Polymer Blend 38:1. THE FLORY-HUGGINS MODEL Gibbs free energy density: Scattering factor: 38:2. BINODAL AND SPINODAL LINES Chemical potential: Osmotic pressure:

  3. 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:

  4. GIBBS FREE ENERGY PHASE DIAGRAM

  5. 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.

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