Non-woven shape-memory polymer blend actuators

Abstract

Abstract The hierarchical design approach provides various opportunities to adjust the structural performance of polymer materials. Electrospinning processing techniques give access to molecular orientation as a design parameter, which we consider here in view of the shape-memory actuation performance. The aim of this work is to investigate how the reversible strain $$\varepsilon^{\prime}_{{{\text{rev}}}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>ε</mml:mi> <mml:mtext>rev</mml:mtext> <mml:mo>′</mml:mo> </mml:msubsup> </mml:math> can be affected by a morphology change from a bulk material to an electrospun mesh. $$\varepsilon^{\prime}_{{{\text{rev}}}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>ε</mml:mi> <mml:mtext>rev</mml:mtext> <mml:mo>′</mml:mo> </mml:msubsup> </mml:math> could be increased from 5.5 ± 0.5% to 15 ± 1.8% for a blend from a multiblock copolymer with poly( ε -caprolactone) (PCL) and poly( L -lactide) (PLLA) segments with oligo( D -lactide) (ODLA). This study demonstrates an effective design approach for enhancing soft actuator performance, which can be broadly applied in soft robotics and medicine. Graphic abstract