Cold deformation shape memory effect of PLLA-PCL random copolymer

The synthesis of Poly-L-lactide(PLLA)/Poly-e-caprolactone(PCL) random copolymer initiated by stannous octoate Sn(Oct)2 has been systematically studied.The structure,composition and thermal properties of copolymers are characterized by means of FTIR and differential scanning calorimetry(DSC).The mechanical behavior of copolymers in glass state shows that the large strain after yielding is high elastic strain in essence.The cold deformation shape memory effect is studied by tensile test.The experimental results show that the composition,deformation strain and retention temperature have an obvious effects on the cold deformation shape memory effect.With the deformation strain increasing,the shape recovery rate decreases.And better cold deformation shape memory effect can be obtained at the lower retention temperature.