Block and graft copolymers with blocks that are identical to, miscible with or adhere to related components of a polymer blend can serve as compatibilizers. The relatively simple models established by Leibler and Noolandi provide the basis for addressing the influence of partial interaction parameters between the individual segments of two homopolymers and one copolymer and the influence of the copolymer block length ratio on the compatibilization efficiency. The maximum compatibilization efficiency for both the wet and dry brush formulae is obtained for a slightly longer chain of units compatible with the dispersed phase than that compatible with the matrix. A negative interaction parameter between a copolymer block and any homopolymer leads to lower copolymer contents at the interface and thus to a weaker compatibilization effect. If the units of one block of copolymer are miscible with one of the homopolymers and the units of the second block are immiscible with the second homopolymer, the copolymer content at the interface is lower than that when the mentioned interaction parameters are zero, and the compatibilization effect becomes weaker.

具有与聚合物共混物的相关组分相同，可混溶或粘附的嵌段的嵌段和接枝共聚物可以用作增容剂。Leibler和Noolandi建立的相对简单的模型为解决两种均聚物和一种共聚物的各个链段之间的部分相互作用参数的影响以及共聚物嵌段长度比对增容效率的影响提供了基础。对于与分散相相容的单元链比与基质相容的单元更长的链，可获得湿刷配方和干刷配方的最大增容效率。共聚物嵌段与任何均聚物之间的负相互作用参数导致界面处较低的共聚物含量，从而导致较弱的增容效果。