文档介绍：-Flory-,andstronglydependentonthechemicalstructuresandcondensedstatesofthesamples. Crosslinkedpolymer:onlycanbeswelled. CrystallinePE:dissolveatthetemperatureapproachedtoits meltingtemperature. CrystallineNylon6,6:dissolvedatroomtemperaturebyusingthe (判据)(DE/v)cohesiveenergydensity(内聚能密度)d=(DE/v)1/2:solubilityparameter(溶度参数)1-1+2-21-2+1-(混合焓)1:solvent;2:’sEnthalpyofmixingMixingprocess:Differentpairsinsolution: solvent-solventmolecule:[1-1],e11 solute-solutesegment:[2-2],e22 solvent-solute:[1-2],e12Flory-Hugginsparameter:(interactionparameter)volumefractionofsolvent~[1-2](1)Entropyofmixingforidealsolution(2)(segment)-Hugginstheory(LatticeModel(格子模型))体系中有N1个溶剂分子+N2个链段数为x的高分子总格子数:N=N1+xN2已有j个高分子放入,剩下N-xj个空格,求第j+1个高分子的放置方式Wj+1???+1个高分子的第1个链段的概率N-+1个高分子的第2个链段的概率Z(N-xj-1)/+1个高分子的第3个链段的概率(Z-1)(N-xj-2)/N….(Z-1)(N-xj-x+1)/Z–1Entropyofsolution:总方式EntropyofmixingfromFHtheoryUsingStirling’sapproximation(lnx!xlnx–x),wehave:Entropyofthepuresolventandpurepolymer:(N1=0)andTherefore,andwhereFreeEnergyofFHTheoryHugginsEnthalpy:GibbsFreeEnergy:摩尔数分子数一般通式ForPolymerSolutionsx1=1Chemicalpotentials(化学位):(forsolvent)(forpolymer)Inthecaseoff2<<1,c<1/2,goodsolventc=1/2,thetaQsolventc>1/2,poorsolventc=1/2,有热效应的“理想溶液”???