2. Huggin,s Enthalpy of minong hxt A Different pairs in solution solvent-solvent molecule: [1-1,6 solute-solute segment: [2-2,E2 solvent-solute: [1-21,612 Mixing process:1-1]+-[2-2]=[1-2] ●→0● N, v and o xN,L AE2=612-(E1+82) N,+xN. y N+xN. y △H P24812 P12 total pairs of[1-2 AH=(2-2)N中24E12 Inning (Z-2)xN24E1 =[(z-2)x+19N2=(z-2)N2 kTxN中2=R7xn2 cells surrounding number of polymers im-kTxpa2=Vm928-82/N a polymer volume fraction of solvent- Possibility 2(z-2)△ 12-V(82-82 of the cell occupied by solvent. RT Flory-Huggins parameter2. Huggin’s Enthalpy of mixing Mixing process: 1 [2 2] 2 1 [ 2 1 1]    [ 2 1 ]  12 12  11 22  1 2 'H H   H H Different pairs in solution: solvent-solvent molecule: [1-1], H11 solute-solute segment: [2-2], H22 solvent-solute: [1-2], H12 ' 'H H P mixing 12 12 1 2 12 ( 2) ' I H ZN mixing  'H 12 ( 2) Z kT F  'H ' H kT N mixing F 1 2 I Flory-Huggins parameter: (interaction parameter) P Zx 12  >( 2) 2@ volume fraction of solvent ~ Possibility of the cell occupied by solvent. cells surrounding a polymer number of polymers P12 total pairs of [1-2] 1 1 1 1 2 s m N V N N xN V I  2 2 2 1 2 s m xN xN V N xN V I  and N1 N2 10 I1 1 2 N2  ( 2) Z N I RT n F 1 2 I = 1 2 m s V kT V FI I > @ 2 12 1 2 / V N m  II G G    2 Vs 1 2 RT G G  2 1 12  ( 2) Z xN I 'H V V s ps with x segments