Pre-foamed particles of polypropylene was made from HMSPP.The effects of vesicant, nucleating agent, gel content of HMSPP and process on particle foam density were studied.

• 3.；探讨了HMSPP的凝胶含量、不同制备工艺流程、发泡剂、成核剂对珠粒发泡密度的影响。