CUED Publications database

In situ measurements of free volume during recovery process of a shape memory polymer

García-Huete, N and Axpe, E and Cuevas, JM and Mérida, D and Laza, JM and García, J and Vilas, JL and Plazaola, F and León, LM (2016) In situ measurements of free volume during recovery process of a shape memory polymer. Polymer, 109. pp. 66-70.

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Abstract

The physics and mechanics governing the shape memory effect in shape memory polymers is not fully understood at the nanoscale. A very recent publication highligths a possible link between the free volume of the polymer and its ability to recover the original shape in shape memory cycles. In this study, it is demonstrated that there is a reorganisation of the monomeric unit of polymer chains via molecular sized free volume that makes the shape recovery possible. For that purpose, the free volume properties are measured in situ during the shape recovery process of a crosslinked polycyclooctene shape memory polymer by employing positron annihilation lifetime spectroscopy. By this technique, the size and distribution of the dynamic subnanoscale free volume holes are obtained by measuring the lifetime of the positrons inside the polymer at different stages of the shape recovery.

Item Type: Article
Uncontrolled Keywords: shape memory polymer in situ free volume positron annihilation lifetime spectroscopy
Subjects: UNSPECIFIED
Divisions: Div C > Biomechanics
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 20:07
Last Modified: 18 Jul 2017 08:40
DOI: