摘要
Poly(lactic acid)(PLA) was blended with various polycaprolactone(PCL) components through the melt blending process for toughening modification on PLA.The tensile testing,scanning electron microscope(SEM) and differential scanning calorimetry(DSC) were implemented to analyze mechanical properties,disperse morphology,thermal properties and compatibility of composite materials,respectively.The shape memory performance of PCL/PLA composites was also investigated.The results showed that the elongation at break of composites increased by 10 and 15 times than pure PLA with adding 20% and30% by weight of PCL,and the yield strength retention rates were77% and 67%,respectively.The SEM showed that PCL/PLA composite was a semi-compatible system.PCL particles could be evenly dispersed in the PLA at 20% or 30% by weight PCL content,and the particle size was very small.DSC results showed a decline in Tg and Tm whereas an increase in Td with the addition of PCL.The addition of PCL could improve the shape memory performance of PLA.The shape memory performance was enhanced with the PCL content increase,but decreased with the tensile strain increase.The best temperature for shape recovery was between 60 and 70 ℃,and the shape memory performance remained 80% after 5 times recycle.
Poly（lactic acid）（PLA） was blended with various polycaprolactone（PCL） components through the melt blending process for toughening modification on PLA.The tensile testing,scanning electron microscope（SEM） and differential scanning calorimetry（DSC） were implemented to analyze mechanical properties,disperse morphology,thermal properties and compatibility of composite materials,respectively.The shape memory performance of PCL/PLA composites was also investigated.The results showed that the elongation at break of composites increased by 10 and 15 times than pure PLA with adding 20% and30% by weight of PCL,and the yield strength retention rates were77% and 67%,respectively.The SEM showed that PCL/PLA composite was a semi-compatible system.PCL particles could be evenly dispersed in the PLA at 20% or 30% by weight PCL content,and the particle size was very small.DSC results showed a decline in Tg and Tm whereas an increase in Td with the addition of PCL.The addition of PCL could improve the shape memory performance of PLA.The shape memory performance was enhanced with the PCL content increase,but decreased with the tensile strain increase.The best temperature for shape recovery was between 60 and 70 ℃,and the shape memory performance remained 80% after 5 times recycle.
基金
National Natural Science Foundation of China(No.51303085)
Prospective Joint Research Project of Jiangsu Province,China(No.BY2015047-14)
