摘要
利用链段浓度和链头浓度的概念，根据热力学涨落理论，给出了聚合物二元共混体系ｄｅＧｅｎｎｅｓ散射函数的一个普遍的热力学证明，指出了这个函数和Ｆｌｏｒｙ－Ｈｕｇｇｉｎｓ共混自由能公式一样，也依赖于忽略构象涨落的假设．
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.
出处
《高分子学报》
SCIE
EI
CAS
CSCD
北大核心
1995年第3期332-336,共5页
Acta Polymerica Sinica
基金
国家基础性重大关键项目
关键词
链段浓度
链头浓度
共混体系
散函数
Segmental concentration,Chainhead concentration, Molecular concentration,Scattering function, Thermodynamical fluctuation
