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. Author manuscript; available in PMC: 2013 May 15.

Published in final edited form as: J Polym Sci B Polym Phys. 2012 Mar 4;50(10):724–737. doi: 10.1002/polb.23056

Shape memory cycles performed on a H20 foam sample (Tg~50 °C) in a constrained stress recovery mode. (a) Four steps of Shape Memory cycle are shown: (A) Loading: The sample heated up to Tg+30 °C and a 80% compressive strain applied. (B) Fixing: The compressed sample cooled down to Tg−20 °C. (C) Stress Recovery: Sample heated to Tg+30 °C. (D) Unloading: Strain released at Tg+30 °C. (b) The stress vs. strain behavior of the foams for the 5 cycles. (c) The stress vs. temperature behavior of the foam s for 5 cycles. Stages (A), (B), (C) and (D) on plots represent the steps of loading, fixing, stress recovery and unloading respectively.

Shape memory cycles performed on a H20 foam sample (Tg~50 °C) in a constrained stress recovery mode. (a) Four steps of Shape Memory cycle are shown: (A) Loading: The sample heated up to Tg+30 °C and a 80% compressive strain applied. (B) Fixing: The compressed sample cooled down to Tg−20 °C. (C) Stress Recovery: Sample heated to Tg+30 °C. (D) Unloading: Strain released at Tg+30 °C. (b) The stress vs. strain behavior of the foams for the 5 cycles. (c) The stress vs. temperature behavior of the foam s for 5 cycles. Stages (A), (B), (C) and (D) on plots represent the steps of loading, fixing, stress recovery and unloading respectively.