离子液体[bmim]PF6对聚乳酸的增塑作用

合成了离子液体[bmim]PF6(1-丁基-3-甲基咪唑六氟磷酸盐),并对其进行了表征。用TG、DSC和偏光显微镜等手段研究了[bmim]PF6对聚乳酸的增塑作用,并比较了它与聚乙二醇300(PEG300)的增塑效果。热重分析结果表明,PEG300作增塑剂时,由于其热降解温度较低,聚乳酸热稳定性变差;离子液体[bmim]PF6作增塑剂时,由于其热失重温度高于聚乳酸热降解温度,用其增塑的聚乳酸热稳定性变好。当[bmim]PF6的质量分数从2%增加到10%时,聚乳酸材料的玻璃化转变温度(Tg)随之降低,当加入质量分数为10%的[bmim]PF6时,聚乳酸材料的Tg降至40℃。偏光显微镜观察看出,加入[bmim]PF6后聚乳酸分子链段的活动能力增强,促进了聚乳酸的结晶,且随其用量增加,结晶度增加。该文报道工作的新颖性,已为教育部科技查新工作站(Z12)于2008年2月26日出具的第ZDT2008017号《科技查新报告》所证实。

The Effect of Ionic Liquid[bmim]PF6as Plasticizer for Polylactide

Ionic liquid[bmim]PF_6(1-butyl-3-methylimidazolium hexafluorophosphate) was synthesized,characterized and used as plasticizer of poly(L-lactide)(PLLA).TG results show that the thermal stability of PLLA plasticized with the ionic liquid was better than that plasticized with PEG300.Glass transition temperature(Tg) of PLLA decreases with increasing mass fraction of ionic liquid[bmim]PF_6 from 2% to 10%.The Tg of PLLA can be reduced to 40 ℃ when the mass fraction of ionic liquid[bmim]PF_6 was 10%.Polarizing microscope shows that the segment of PLLA molecular is more active due to the plasticizing,and the crystallization property is enhanced by the plasticizer.The novelty of this work was confirmed by the report(No.ZDT2008017) provided by the science and technology searching workstation(No.Z12) of Ministry of Education on Feb 26,2008.