Connecting free volume with shape memory properties in noncytotoxic gamma‐irradiated polycyclooctene

The free volume holes of a shape memory polymer have been analyzed considering that the empty space between molecules is necessary for the molecular motion, and the shape memory response is based on polymer segments acting as molecular switches through variable flexibility with temperature or other...

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Published in:Journal of polymer science. Part B, Polymer physics Polymer physics, 2015-08, Vol.53 (15), p.1080-1088
Main Authors: Axpe, Eneko, García‐Huete, Nuria, Cuevas, José María, Ribeiro, Clarisse, Mérida, David, Laza, José Manuel, García, José Ángel, Vilas, José Luis, Lanceros‐Méndez, Senentxu, Plazaola, Fernando, León, Luis Manuel
Format: Article
Language:English
Subjects:
Chains (polymeric)
Ciências Físicas
Ciências Naturais
free volume
Gamma irradiation
gamma radiation
Gamma rays
gamma-irradiated polycylooctene
medicine
noncytotoxic polymers
polymers
Positron annihilation
positron annihilation lifetime spectroscopy
Recovery
Science & Technology
Shape memory
shape memory polymers
Spectroscopy
temperature
Thermomechanical analysis
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Summary:The free volume holes of a shape memory polymer have been analyzed considering that the empty space between molecules is necessary for the molecular motion, and the shape memory response is based on polymer segments acting as molecular switches through variable flexibility with temperature or other stimuli. Therefore, thermomechanical analysis (TMA) and positron annihilation lifetime spectroscopy (PALS) have been applied to analyze shape recovery and free volume hole sizes in gamma‐irradiated polycyclooctene (PCO) samples, as a noncytotoxic alternative to more conventional PCO crosslinked via peroxide for future applications in medicine. Thus, a first approach relating structure, free volume holes and shape memory properties in gamma‐irradiated PCO is presented. The results suggest that free volume holes caused by gamma irradiation in PCO samples facilitate the recovery process by improving movement of polymer chains and open possibilities for the design and control of the macroscopic response. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015, 53, 1080–1088
ISSN:0887-6266
1099-0488
DOI:10.1002/polb.23750