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采用熔融共混法分别制备了凹凸棒黏土质量分数为1%、3%和5%的纳米凹凸棒黏土(ATT)/聚乳酸(PLA)复合材料,研究了ATT对PLA结晶性能和热稳定性能的影响。结果表明,ATT与PLA基体具有较好的相容性,当ATT含量低于3%时,可以均匀的分散在PLA基体中,而达到5%时则会发生团聚。FTIR结果表明,ATT与PLA基体之间存在较强的相互作用。ATT可明显促进PLA的结晶,起到异相成核的作用。ATT纳米颗粒的添加引起了PLA冷结晶峰向低温方向移动,使冷结晶温度从114.4℃降低至103℃左右。含ATT体系结晶速率比纯PLA快,表明ATT的加入可以促进PLA的结晶,说明ATT是PLA有效的成核剂之一。添加ATT可明显加快PLA的结晶速率并减小球晶尺寸。当添加3%ATT时,ATT/PLA复合材料的热分解温度比纯PLA提高了11℃,这主要是由于ATT/PLA网络密度的提高,使ATT在PLA的降解过程中能够起到较好的阻隔作用,抑制了PLA的降解自加速过程。
The nano-attapulgite clay (ATT) / polylactic acid (PLA) composites with attapulgite clay mass fraction of 1%, 3% and 5% were prepared by melt blending method. The effects of ATT on the crystallization and thermal stability of PLA Impact. The results show that ATT has good compatibility with PLA matrix. When the content of ATT is less than 3%, it can be uniformly dispersed in the matrix of PLA. When the content of ATT reaches 5%, it will agglomerate. FTIR results show that there is a strong interaction between ATT and PLA matrix. ATT can obviously promote the crystallization of PLA and play the role of heterogeneous nucleation. The addition of ATT nanoparticles caused the cold crystallization peak of PLA to shift to the low temperature, which reduced the cold crystallization temperature from 114.4 ℃ to about 103 ℃. The crystallization rate of ATT-containing system is faster than that of pure PLA, indicating that the addition of ATT can promote the crystallization of PLA, indicating that ATT is one of PLA effective nucleating agents. Addition of ATT can significantly accelerate the crystallization rate of PLA and decrease the spherulite size. When 3% ATT was added, the thermal decomposition temperature of ATT / PLA composites was 11 ℃ higher than that of pure PLA, which was mainly due to the increase of ATT / PLA network density, which made ATT play a better role in PLA degradation Barrier, inhibition of PLA degradation from the acceleration process.