Designing Multiple-Shape Memory Polymers with Blends: Evidence of Shape Memory Effect for PLA-PCL Blends

Shape memory properties of polymers represent one of the most expanding fields in polymer science related to numerous smart applications. Recently, multiple-shape memory polymers (multiple-SMPs) have attracted significant attention and can be achieved with complex polymer architecture. In this study, a cross-linking strategy has been put forward to fabricate the multiple-shape networks via chemical-cross-linking in solid state and PLA-PCL Blends are investigated to design multiple-SMPs. The structures of all the precursors were determined by SEM, and all networks were evaluated by swelling test. Differential Scanning Calorimetry (DSC) analysis reveals that all the PLA-PCL blends display two thermal transitions (Tm,PLA and Tm,PCL), which can be utilized as Ttransto trigger multiple-shape memory behavior. The thermal mechanical testing for shape memory effects was performed by TMA, demonstrates that the composition ratio of two phases has a great effect on shape fixity and shape recovery. Moreover, a practical application as heatshrinkable tube (or film) has been put forward