文章以过氧化二叔丁基（DTBP）作为聚丙烯（PP）降解的引发剂，选择硬脂酸钴和硬脂酸锌作为催化过氧化物分解的添加剂，讨论添加剂对PP降解的影响。结果表明：随着DTBP含量的增加，PP的熔体流动速率（MFR）明显增加，力学性能下降，结晶性能提高。当引发剂含量增加到0.6%~0.8%时，熔融曲线出现双峰，黏度和模量下降。加入添加剂硬脂酸钴时，冲击性能下降34.63%，黏度和模量下降，PP的MFR进一步增加，最高的MFR比没有加入添加剂的样品高出59.08%，结晶性能高于没加添加剂的样品，晶体排列更规整。加入添加剂硬脂酸锌时，冲击性能下降，黏度和模量下降，最高的MFR比没有加入添加剂的样品高200.99%，晶体排列最规整。因此，硬脂酸锌更适合作为化学法降解PP的添加剂。

Di-tert-butyl peroxide (DTBP) was used as the initiator of polypropylene (PP) degradation, and cobalt stearate and zinc stearate were selected as the additives to catalyze the decomposition of peroxide. The effects of additives on PP degradation was discussed. The results show that with the increase of DTBP content, the melt flow rate (MFR) of PP increases obviously, the mechanical properties decreases, and the crystallization properties improves. When the initiator content increases to 0.6%~0.8%, the melting curve shows two peaks, and the viscosity and modulus decreases. When cobalt stearate is added, the impact property is decreased by 34.63%, the viscosity and modulus decreases, and the MFR of PP further increases. The highest MFR is 59.08% higher than that of the sample without additive, and the crystallization property is higher than that of the sample without additive, and the crystal arrangement is more regular. When zinc stearate is added, the impact property decreases, and the viscosity and modulus decrease. The highest MFR is 200.99% higher than that of the sample without additive, and the crystal arrangement is the most regular. Therefore, zinc stearate is more suitable as an additive for chemical degradation of PP.