Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

On the Size Effect of Additives in Amorphous Shape Memory Polymers

Version 1 : Received: 13 December 2020 / Approved: 14 December 2020 / Online: 14 December 2020 (12:02:39 CET)

A peer-reviewed article of this Preprint also exists.

Zirdehi, E.M.; Dumlu, H.; Eggeler, G.; Varnik, F. On the Size Effect of Additives in Amorphous Shape Memory Polymers. Materials 2021, 14, 327. Zirdehi, E.M.; Dumlu, H.; Eggeler, G.; Varnik, F. On the Size Effect of Additives in Amorphous Shape Memory Polymers. Materials 2021, 14, 327.

Journal reference: Materials 2021, 14, 327
DOI: 10.3390/ma14020327

Abstract

Thermal shape memory polymers (SMPs) find increasing applications in biology and medicine due to their promising potential for improved biocompatibility. In such applications, the inevitable penetration of small molecules from the ambient fluid into the polymer influences the shape recovery process and often leads to a reduction of the temperature, at which shape recovery takes place. We show here via molecular dynamics simulations that the size of additive molecules plays a key role for this process. While the effect of concentration on the recovery rate is monotonic in the investigated range, a non-monotonic dependence on the size of additive molecules emerges at temperatures close to the glass transition. This work thus identifies the additives’ size to be a qualitatively novel parameter for switching the recovery process in polymer-based shape memory materials.

Subject Areas

Shape memory polymers; Size effect of additives; Molecular dynamics simulations

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