THERMODYNAMICAL FOUNDATION OF DE GENNES SCATTERING FUNCTION
聚合物体系散射函数的热力学基础

he concepts of two concentrations,namely segmental and molecular concentrations for polymer blends has been proposed.The former is equivalent to the ordinary volume fraction and the latter is defined as the number of the chain heads in the unit volume for every polymer component.The entropy part of the Flory-Huggins free energy should be represented by the molecular concentration, and the mixing heat part should be represented by the segmental concentration.The two concentrations will be correlated each other by the conformational function of the said polymer chain. When neglecting the conformational fluctuation and considering only the influence of the molecular concentration fluctuation,the de Gennes scattering function for polymer binary blends has been deduced on the basis of the general thermodynamical fluctuation theory.