以丁腈橡胶（ＮＢＲ）和氢化丁腈橡胶（ＨＮＢＲ）共聚物为增容剂，用扫描电镜（ＳＥＭ）对ＰＶＣ／ＨＤＰＥ共混物的形态进行了研究。共聚物ＮＢＲ（ＨＮＢＲ）加入共混物中后，使冲击断面形貌发生变化。表明两相间粘合力增大，相分离程度减小，改变增容剂的种类和用量以及共混组成，均将对体系的形态结构产生影响。 The morphology of PVC / HDPE blends was studied by scanning electron microscopy (SEM) with NBR and HNBR copolymers as compatibilizers. Copolymer NBR (HNBR) added to the blend, the impact cross-section morphology changes. It shows that the adhesion between the two phases is increased, the degree of phase separation is reduced, and the type and amount of compatibilizer and the composition of the blend are all changed, which will affect the morphology and structure of the system.