一种酰胺类成核剂对聚乳酸结晶行为的影响

Effect of Acylamino Nucleating Agent on Crystallization Behavior of Poly(L-lactic Acid)

通过自主设计合成一种含酰胺结构的新型成核剂——1,6-二苯基己烷基脲（NA6）,并利用差示扫描量热仪（DSC）和偏光显微镜（POM）研究了NA6成核剂（1~8wt%）对聚乳酸（PLLA）结晶行为的影响。结果表明,随着NA6成核剂含量的增加,PLLA的结晶温度由93.8℃提高到118.6℃,结晶度由12.0%提高到65.5%;130℃时的等温结晶速率提高到0.56min-1,是纯PLLA的14.5倍。此外,NA6成核剂可显著减小PLLA的球晶尺寸,且随着成核剂含量的提高成核效果愈加明显。

A novel nucleating agent-1,6-diphenyl hexyl carbamide（NA6）with a structure of amide was synthesized to prepare PLLA/NA6 blends.The influence of the nucleating agent content（1-8 wt%）on crystallization and crystal morphology was researched by using differential scanning calorimeter（DSC）and polarizing optical microscopy（POM）.The results first reveal that pure PLLA shows a crystallization peak（Tc）at 93.8℃.Later the Tcvalue shifts gradually to 118.6℃with increasing NA6 content in the PLLA/NA6 blend,and at the same time,the crystalline degree increases from 12.0%to 65.5%.The results also indicate that the isothermal crystallization rate at 130℃ increases to 0.56min-1,14.5times as much as that of pure PLLA.Moreover,the size of PLLA spherulites becomes smaller and the nucleating effect gets more significant with the increase of NA6 content.