相容剂又称增容剂，是指借助于分子间的键合力，促使不相容的两种聚合物结合在一体，进而得到稳定的共混物的助剂，这里是指高分子增容剂。
Compatibilizer, also known as compatibilizer, refers to the use of intermolecular bonding force to promote the incompatibility of two kinds of polymers in one, and then to obtain a stable blend of additives, here refers to the polymer compatibilizer.
目前比较好的相容剂通常以马来酸酐接枝，马来酸酐单体和其它单体比较极性比较强，相容效果比较好。
At present, the better compatibilizer is usually grafted with maleic anhydride. Compared with other monomers, the maleic anhydride monomer has stronger polarity, and the compatibility is better.
相容剂的作用机理 ：相容剂的增容作用本质上说是借助于分子间的键合力来实现的，可以起到类似油分散于水中所用的表面活性剂的作用。
The mechanism of compatibilizer: Compatibilization of compatibilizer is essentially realized by the bonding force between molecules. It can act as a surfactant used in water dispersion.
相容剂可分为两类，即非反应型相容剂和反应型相容剂。[
Compatibilizer can be divided into two categories, i.e., non reactive compatibilizer and reactive compatibilizer. [
一、非反应型相容剂
Non reactive compatibilizer
非反应型相容剂是目前比较通用相容剂。在不相容的高分子体系中通过添加非反应型相容剂而实现相容化的方法，在高分子合金技术中是最常见的。非反应型相容剂一般为共聚物，可以是嵌段共聚物，也可以是接枝共聚物或无规共聚物。
Non reactive compatibilizer is a universal compatibilizer at present. In incompatible polymer systems, the method of compatibility by adding non reactive compatibilizer is the most common in polymer alloy technology. The non reactive compatibilizer is generally a copolymer and may be a block copolymer or a graft copolymer or a random copolymer.
二、反应型相容剂  反应型相容剂是一种同非极性高分子主链Pc及活性基团（如羟基、环氧基组成，多为无规的）组成的聚合物。
Two, reactive compatibilizer, reactive compatibilizer is a polymer with non-polar polymer backbone Pc and active groups (such as hydroxyl group, epoxy group, mostly random).
一般是大分子型的，其活性官能团可以在分子的末端，也可以在分子的侧链上，其大分子主链可以和共混体系中的至少一种高分子基体相同，也可以不同，但在不同的情况下，其大分子主链应和共混体系中的至少一种高分子基体有较好的相容性。
The general is a large molecule type, which can active functional groups at the molecular ends, also can be in the side chain of molecules, the molecular chain can at least a polymer matrix and blends of the same, can also be different, but in different situations, at least one of the polymer backbone and the matrix the blends have good compatibility.