高分子物理（ 复旦大学） chapter3 高分子溶液.ppt

第三章 高分子溶液 Chapt. 3 Polymer Solutions 3.1 Criteria (判据) of Polymer Solubility 2. Huggin’s Enthalpy of mixing 3.2 Thermodynamics of Polymer Solutions Flory-Huggins theory (Lattice Model (格子模型)) Entropy of mixing from FH theory Entropy of mixing from FH theory Free Energy of FH Theory Chemical potentials (化学位): Osmotic pressure (渗透压): Appendix: Osmotic pressure Polymer Shapes in Dilute Solutions 3.3 Chain Conformations in Dilute Solutions 溶液中真实单链的末端距概率分布函数W(h,x) 1. Polymer chain in good solvents –method I 2. Polymer chain in good solvents - method II How to get ideal chain? 3. Polymer chain in poor solvents-Method I 3. Polymer chain in poor solvents-Method II Polymer Shapes in Dilute Solutions (1) Polymer in a good solvent h2 ~ S2 ~N6/5 (2) Polymer in a Q solvent h2 ~ S2 ~N1 (3) Polymer in a poor solvent h2 ~ S2 ~N2/3 3.4 Semi-dilute Solutions of Polymers overlap concentration c* Scaling Law of semi-dilute solution Apparent correlation length xapp: Polymer Shapes in Semi-dilute Solutions 3.5 Concentrated Solutions of Polymers Flory-Huggins free energy of a gel Basic Equation of Gel Swelling Volume Phase Transition of Gels 3.6 Solutions of Polyelectrolytes 3.7 Thermodynamics of Polymer Mixtures Why are two kinds of polymers not compatible? The Phase Behavior of Polymer Mixtures Phase Diagram and Phase Equilibrium How to calculate the phase diagram from free energy ? Finding the phase equilibrium conditions (1) Phase equilibrium curve – binodal (2) Metastable/unstable limits - spinodal (3) Critical point Critical points dependence of N UCST/LCST Why UCST or LCST Phase Equilibrium Phase Separation Dynamics Phase diagram and phase separation mechanisms Phase Separation Mechanisms Phase Separation Mechanisms Examples of Phase Separation Dynamics 3.8 Theromodynamics of Block Copolymers Self-assembly of Diblock Copolymers Microphase Separation of Diblock Copolymers (BCPs) Microphase Separation of Triblock Copolymers