以过氧化苯甲酰（ＢＰＯ）为引发剂、二甲苯为界面剂，研究丙烯酸（ＡＡ）在粉料高密度聚乙烯（ＨＤＰＥ）上的固相接枝反应．红外光谱证实了该接枝反应。Ｘ光衍射发现接枝后的ＨＤＰＥ结晶度下降不多，表明接核反应发生在ＨＤＰＥ的无定区域和晶区表面或晶区缺陷上。实验还发现，随着引发剂用量、ＨＤＰＥ颗粒度的增加，反应温度的升高，单体／聚合物比增加，接枝率提高。本研究制得的ＨＤＰＥ—ｇ—ＡＡ，其接枝率可高达１５．９２％。 Using benzoyl peroxide (BPO) as initiator and xylene as the interfacial agent, the solid-phase grafting reaction of acrylic acid (AA) on powdery high density polyethylene (HDPE) was studied. Infrared spectroscopy confirmed the grafting reaction. X-ray diffraction showed that the degree of crystallinity of grafted HDPE decreased little, indicating that the nuclear reaction occurred in the HDPE amorphous region and the crystal surface or grain defects. The experiment also found that, with the amount of initiator, HDPE particle size increases, the reaction temperature increases, the monomer / polymer ratio increases, the graft rate increased. The HDPE-g-AA obtained in this study, the grafting rate of up to 15.92%.