In this work we have explored the shape memory capabilities of a novel type of covalently cross-linked semi-crystalline polymers, prepared by exploiting the mild solegel chemistry, starting from alkoxysilane-terminated poly(ε-caprolactone) (PCL), and using silica-based domains as cross-link points. By adopting PCL precursors with different molecular weights, semi-crystalline networks with well defined cross-link densities and with different crystallization and melting temperatures were obtained. Beside a satisfying one-way shape memory behaviour, the materials have displayed a significant two- way shape memory response, undergoing a reversible elongation-contraction process between two distinguished strain levels when subjected to a constant load and cyclically heated/cooled on a temperature region spanning from below the crystallization temperature to above the melting temperature. The applied load and the cross-link density are revealed as key-parameters to obtain tailored actuations. Concurrent wide-angle X-ray diffraction (WAXD) and DSC analyses allowed to ascribe the effect to a structural evolution process occurring during melting and crystallization.

One-way and two-way shape memory behaviour of semi-crystalline networks based on sol-gel cross-linked poly(ε-caprolactone) / S., Pandini; F., Baldi; Paderni, Katia; Messori, Massimo; M., Toselli; Pilati, Francesco; A., Gianoncelli; M., Brisotto; E., Bontempi; T., Riccò. - In: POLYMER. - ISSN 0032-3861. - STAMPA. - 54:(2013), pp. 4253-4265. [10.1016/j.polymer.2013.06.016]

One-way and two-way shape memory behaviour of semi-crystalline networks based on sol-gel cross-linked poly(ε-caprolactone)

PADERNI, KATIA;MESSORI, Massimo;PILATI, Francesco;
2013

Abstract

In this work we have explored the shape memory capabilities of a novel type of covalently cross-linked semi-crystalline polymers, prepared by exploiting the mild solegel chemistry, starting from alkoxysilane-terminated poly(ε-caprolactone) (PCL), and using silica-based domains as cross-link points. By adopting PCL precursors with different molecular weights, semi-crystalline networks with well defined cross-link densities and with different crystallization and melting temperatures were obtained. Beside a satisfying one-way shape memory behaviour, the materials have displayed a significant two- way shape memory response, undergoing a reversible elongation-contraction process between two distinguished strain levels when subjected to a constant load and cyclically heated/cooled on a temperature region spanning from below the crystallization temperature to above the melting temperature. The applied load and the cross-link density are revealed as key-parameters to obtain tailored actuations. Concurrent wide-angle X-ray diffraction (WAXD) and DSC analyses allowed to ascribe the effect to a structural evolution process occurring during melting and crystallization.
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4253
4265
One-way and two-way shape memory behaviour of semi-crystalline networks based on sol-gel cross-linked poly(ε-caprolactone) / S., Pandini; F., Baldi; Paderni, Katia; Messori, Massimo; M., Toselli; Pilati, Francesco; A., Gianoncelli; M., Brisotto; E., Bontempi; T., Riccò. - In: POLYMER. - ISSN 0032-3861. - STAMPA. - 54:(2013), pp. 4253-4265. [10.1016/j.polymer.2013.06.016]
S., Pandini; F., Baldi; Paderni, Katia; Messori, Massimo; M., Toselli; Pilati, Francesco; A., Gianoncelli; M., Brisotto; E., Bontempi; T., Riccò
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/960092
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