Comparative Studies on Thermomechanical Behavior of Veriflex®, a Shape Memory Polymer,for a Low Strain (ϵm = 70%): Laser Experiments |
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| Authors: | A M Sarwaruddin Chowdhury Christina Schmidt Klaus Neuking Gunther Eggeler |
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| Institution: | 1. Institut für Werkstoffe, Ruhr-Universit?t Bochum , Bochum, Germany;2. Department of Applied Chemistry &3. Chemical Technology , University of Daka , Dhaka, Bangladesh;4. Institut für Werkstoffe, Ruhr-Universit?t Bochum , Bochum, Germany |
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| Abstract: | An interesting comparative case study on thermomechanical cycles including programming, cooling, unloading and heating to trigger the 1WE was done using Veriflex® at 62°C (T < Tg close to and below 5°C of Tg) and also at 72°C (T > Tg, close to and above 5°C of Tg) for slightly low strains (?m = 70%) and the recovery time of 10 min. Accumulation of strain was estimated during the thermomechanical treatments for using both 70% strains at 62°C (T < Tg), as well as at 72°C (T > Tg). Recovery ratios for 70% strains at 62°C (T < Tg), as well as for 72°C (T > Tg) were also estimated. It turns out that programming, cooling, unloading and heating to trigger the 1WE causes an increase of irreversible strain and is associated with a corresponding decrease of the intensity of the 1WE, in particular, during the first thermomechanical cycles. A LSCM (Laser Scanning Confocal Microscopic) study shows very little change in surface structure which evolved during cycling up to 70% strains at 72°C (T > Tg). |
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| Keywords: | Shape memory polymers Veriflex® thermomechanical cycles stress strain and recovery ratio |
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