A series of crosslinked poly(epsilon-caprolactone) (PCL) materials were obtained starting from linear, three- and four-arm star PCL functionalized with methacrylate end-groups, allowing to tune the melting temperature (T-m) on a range between 36 and 55 degrees C. After deforming the specimens at 50% above T-m, the materials are seen to fully restore their original shape by heating them on a narrow region close to T-m; further, when the shape memory effect is triggered under fixed strain conditions, the materials are able to exert stress on a range between 0.2 and 7 MPa. The materials also display two-way shape memory features, reversibly moving between two shapes when cooled and heated under a fixed load. Finally, to investigate the application of the PCL materials as self-expandable stents, one-way shape memory experiments are currently carried out on tubular specimens.
Tailored One-Way and Two-Way Shape Memory Response of Poly(ε-Caprolactone)-Based Systems for Biomedical Applications / Pandini, Stefano; Passera, Simone; Riccò, Theonis; Borboni, Alberto; Bodini, Ileana; Vetturi, David; Dassa, Luca; Cambiaghi, Danilo; Paderni, Katia; DEGLI ESPOSTI, Micaela; Toselli, Maurizio; Pilati, Francesco; Messori, Massimo. - STAMPA. - 77:(2012), pp. 313-318. (Intervento presentato al convegno Symposium A on Adaptive, Active and Multifunctional Smart Materials Systems of CIMTEC / 4th International Conference on Smart Materials, Structures and Systems tenutosi a Montecatini Terme, ITALY nel JUN 10-14, 2012) [10.4028/www.scientific.net/AST.77.313].
Tailored One-Way and Two-Way Shape Memory Response of Poly(ε-Caprolactone)-Based Systems for Biomedical Applications
PADERNI, KATIA;DEGLI ESPOSTI, Micaela;PILATI, Francesco;MESSORI, Massimo
2012
Abstract
A series of crosslinked poly(epsilon-caprolactone) (PCL) materials were obtained starting from linear, three- and four-arm star PCL functionalized with methacrylate end-groups, allowing to tune the melting temperature (T-m) on a range between 36 and 55 degrees C. After deforming the specimens at 50% above T-m, the materials are seen to fully restore their original shape by heating them on a narrow region close to T-m; further, when the shape memory effect is triggered under fixed strain conditions, the materials are able to exert stress on a range between 0.2 and 7 MPa. The materials also display two-way shape memory features, reversibly moving between two shapes when cooled and heated under a fixed load. Finally, to investigate the application of the PCL materials as self-expandable stents, one-way shape memory experiments are currently carried out on tubular specimens.
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