Simple theoretical models show that concentration of a compatibilizing A-B block copolymer at the interface between the phases of A and B homopolymers in immiscible polymer blends increases with increasing chain length of copolymers or homopolymers. Copolymers with block lengths comparable to chain length of the blend components reduce interfacial tension most efficiently. Distribution of the block copolymer between the interface and the bulk phases is studied assuming that it is controlled by the rules of equilibrium thermodynamics. Analysis is based on Leibler's mean field theory and its modification by Noolandi. The analysis shows that the distribution of the copolymer between the interface and the bulk phases changes in a broad range depending on the system parameters. Substantial part of the added copolymer can be localized at the interface in contrast to assumptions used in previous analyses.

简单的理论模型表明，不相容的聚合物共混物中A和B均聚物相之间界面处相容性AB嵌段共聚物的浓度随共聚物或均聚物链长的增加而增加。具有可与共混物组分的链长相当的嵌段长度的共聚物最有效地降低了界面张力。假定嵌段共聚物受平衡热力学规则控制，则研究其在界面相和本体相之间的分布。分析基于Leibler的平均场理论及其对Noolandi的修改。分析表明，取决于系统参数，共聚物在界面相和本体相之间的分布在很宽的范围内变化。