On the size effect of additives in amorphous shape memory polymers

Zirdehi, E.M. and Dumlu, H. and Eggeler, G. and Varnik, F.

Volume: 14 Pages: 1-16
DOI: 10.3390/ma14020327
Published: 2021

Small additive molecules often enhance structural relaxation in polymers. We explore this effect in a thermoplastic shape memory polymer via molecular dynamics simulations. The additiveto-monomer size ratio is shown to play a key role here. While the effect of additive-concentration on the rate of shape recovery is found to be monotonic in the investigated range, a non-monotonic dependence on the size-ratio emerges at temperatures close to the glass transition. This work thus identifies the additives’ size to be a qualitatively novel parameter for controlling the recovery process in polymer-based shape memory materials. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

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