PDLLA-PCL-PDLLA的添加对PLA/PCL共混材料力学性能的影响

Effect of PDLLA-PCL-PDLLA on Mechanical Property of PLA/PCL Blending Matrtial

通过开环聚合法自主合成聚乳酸聚己内酯（PDLLA‐PCL‐PDLLA ）嵌段聚合物材料，并将其作为聚乳酸／聚己内酯（PLA／PCL）共混体系中两亲性增容剂。通过利用1 H‐NMR、FT‐IR、DMA、FE‐SEM和万能力学实验机对共混材料进行了性能测试，探索增容剂添加量对PLA／PCL共混材料结构和力学性能方面的影响规律。结果表明：随着增容剂PDLLA‐PCL‐PDLLA添加量的提高，在对PLA／PCL共混材料强度影响不大的前提下，断裂伸长率由6．35％提高至15．44％，弹性模量从1782．63 M Pa降到了1471．76 M Pa；共混形貌显示，PCL 在 PDLLA‐PCL‐PDLLA添加量到7％时，在基体PLA中分布均匀。

Poly（DL‐lactide）（PDLLA）‐poly（ε‐caprolactone）（PCL） block copolymers were successfully synthesized by ring‐opening polymerization and used as an amphiphilic compatibilizer in polylactic acid/polycaprolactone （PLA/PCL） blending system .Property test was done for the blending material through 1H‐NMR ,FT‐IR ,DMA ,FE‐SEM and universal tester ,respectively .The influence law of the dosage of bulking agent on the structure and mechanical property of blending material was explored .The results show that elongation at break of PLA/PCL blending material increases from 6 .35% to 15 .44% with the rise in dosage of PDLLA‐PCL‐PDLLA ,but the elasticity modulus of blending material declines to 1 471 .76 MPa from 1 782 .63 MPa .blending morphology shows that PCL is distributed evenly in the matrix PLA when the dosage of PCL in PDLLA‐PCL‐PDLLA reaches 7% .