The "two-way" shape memory response of semicrystalline networks was studied on poly(epsilon-caprolactone)-based systems, crosslinked by thermal curing of methacrylic end-capped linear chains. By changing the methacrylation degree of the precursors, it was possible to vary the network density over one order of magnitude, without any remarkable change in their transition temperatures and crystallinity content. When subjected to a constant stress and to a cooling-heating cycle from above T-m to below T-c, the materials display reversible two-way shape memory capabilities, consisting in a cyclic elongation-contraction effect, which involves significant variations of strain. Two different cooling induced elongational processes are evidenced, one due to entropy elasticity and the other to a crystallization driven effect. The amount of elongation that may be achieved depends on the network density and on the applied stress, and it is maximized for systems with a crosslink density that allows to exploit both the entropy-and the crystallization-induced effect.

The network density as tailoring parameter for the two-way shape memory response of crosslinked poly(ε-caprolactone) / Pandini, Stefano; Dioni, Daniele; Paderni, Katia; Messori, Massimo; Toselli, Maurizio; Riccò, Theonis. - 1599:(2014), pp. 270-273. ((Intervento presentato al convegno 7th International Conference on Times of Polymers (TOP) and Composites 2014 tenutosi a Ischia, Italy nel 22–26 June 2014 [10.1063/1.4876830].

The network density as tailoring parameter for the two-way shape memory response of crosslinked poly(ε-caprolactone)

PADERNI, KATIA;MESSORI, Massimo;
2014

Abstract

The "two-way" shape memory response of semicrystalline networks was studied on poly(epsilon-caprolactone)-based systems, crosslinked by thermal curing of methacrylic end-capped linear chains. By changing the methacrylation degree of the precursors, it was possible to vary the network density over one order of magnitude, without any remarkable change in their transition temperatures and crystallinity content. When subjected to a constant stress and to a cooling-heating cycle from above T-m to below T-c, the materials display reversible two-way shape memory capabilities, consisting in a cyclic elongation-contraction effect, which involves significant variations of strain. Two different cooling induced elongational processes are evidenced, one due to entropy elasticity and the other to a crystallization driven effect. The amount of elongation that may be achieved depends on the network density and on the applied stress, and it is maximized for systems with a crosslink density that allows to exploit both the entropy-and the crystallization-induced effect.
7th International Conference on Times of Polymers (TOP) and Composites 2014
Ischia, Italy
22–26 June 2014
1599
270
273
Pandini, Stefano; Dioni, Daniele; Paderni, Katia; Messori, Massimo; Toselli, Maurizio; Riccò, Theonis
The network density as tailoring parameter for the two-way shape memory response of crosslinked poly(ε-caprolactone) / Pandini, Stefano; Dioni, Daniele; Paderni, Katia; Messori, Massimo; Toselli, Maurizio; Riccò, Theonis. - 1599:(2014), pp. 270-273. ((Intervento presentato al convegno 7th International Conference on Times of Polymers (TOP) and Composites 2014 tenutosi a Ischia, Italy nel 22–26 June 2014 [10.1063/1.4876830].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/1074670
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