β晶型成核剂对聚丙烯力学及结晶性能的影响

Influence of β-Nucleating Agent on the Mechanical and Crystallization Characteristics of Polypropylene

研究了N,N′-二环己胺基对苯二酰胺作为β成核剂对聚丙烯(PP)力学性能及结晶性能的影响。结果表明,成核剂具有使聚丙烯增韧的优异性能,当添加质量分数为0.3%时,其抗冲击强度由原来的36.06 J/m2提高到65.79 J/m2。DSC研究表明,添加β成核剂可以诱导PP中β晶生成。考察了冷却速率对结晶温度的影响,当冷却速率为10℃/m in时,结晶温度从118.38℃提高到124.53℃,表明该成核剂的加入使结晶向高温方向偏移,结晶速度加快。

The influence of β-nucleating agent （N, N′-dicyclohexylterephthalicamide） on the mechanical and crystallization characteristics of polypropylene （PP） was studied. The β-nucleating agent displayed an outstanding effect on increasing the PP toughness. The impact strength rised from 36.09 J/m^2 to 65.79 J/m^2 by adding 0. 3% β-nucleating agent. DSC showed that the addition of a small amount of the β-nucleating agent to PP induced a rather high proportion of fl modification. The effect of cooling rate on the peak crystallization temperature and the crystallinity was also studied. When the cooling rate was 10 ℃/min, the peak temperature increased from 118.38℃ to 124.53℃. Nucleated PP showed a higher crystallization temperature and a faster crystallization rate.