Optimizing the thermomechanics of shape-memory polymers for biomedical applications

Conference Paper

We examine the shape-memory effect in polymer networks intended for biomedical applications. The polymers were photopolymerized from tert-butyl acrylate (tBA) with polyethyleneglycol dimethacrylate (PEGDMA) acting as a crosslinker. Three-point flexural tests were used to systematically investigate the thermomechanics of shape-storage deformation and shape recovery. The glass transition temperature (Tg) of the polymers varied over a range of 100°C and is dependent on the molecular weight and concentration of the crosslinker. The polymers show 100% strain recovery up to maximum strains of approximately 80% at low and high deformation temperatures (Td). Free strain recovery was determined to depend on the temperature during deformation; lower deformation temperatures (Td < Tg) decreased the temperature required for free strain recovery. Constrained stress recovery shows a complex evolution as a function of temperature and also depends on Td. The thermomechanical results are discussed in light of potential biomedical applications and a prototype stent that can be activated at body temperature is presented. © 2005 Materials Research Society.

Full Text

Duke Authors

Cited Authors

  • Yakacki, CM; Gall, K; Shandas, R; Ontega, AM; Willett, N; Greenberg, AR

Published Date

  • January 1, 2004

Published In

Volume / Issue

  • 855 /

Start / End Page

  • 106 - 111

International Standard Serial Number (ISSN)

  • 0272-9172

International Standard Book Number 10 (ISBN-10)

  • 1558998071

International Standard Book Number 13 (ISBN-13)

  • 9781558998070

Digital Object Identifier (DOI)

  • 10.1557/proc-855-w3.27

Citation Source

  • Scopus