Polypropylene is a typical semi-crystalline thermoplastic polymer.Due to the slow crystallization rate of PP melt,it is easy to form big spherulites,resulting in poor gloss and transparency of products,which limits the development of PP in the fields of transparent packaging and daily necessities.At present,most of the modification methods for PP are focused on changing the crystallization behavior of PP crystal.The blending of nucleating agents and PP not only retains the original advantages of PP,but also significantly improves the transparency and surface gloss,which is a common means of PP modification.Based on this,summarize the mechanism of PP crystallization and review the current research status of PP nucleating agents.The types of α nucleating agents are included inorganic nucleating agents,abietic acid nucleating agents,cyclic carboxylate nucleating agents,sorbitol acetal nucleating agents and phosphate ester nucleating agents.The types of βnucleating agents are included fused ring nucleating agents,dicarboxylate nucleating agents,amide nucleating agents,rare earth nucleating agents and compound nucleating agents.
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