Anisotropic shape-memory elastomeric composites: Fabrication and testing

Erika D. Rodriguez, Derek C. Weed, Patrick T. Mather

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Anisotropic shape-memory elastomeric composites (A-SMEC) are fabricated by infiltrating an aligned electrospun fibrous web with an elastomer, and curing. Mechanical testing proves strong anisotropy in Young's modulus (EY), strain-to-failure (Ïμf), and yield stress (σy) observed with averages of EY = 48.4 and 4.0 MPa, Ïμf = 198 and 351%, and σy = 4.6 and 0.9 MPa for longitudinal and transverse loading directions, with respect to the fibrous web's orientation. Shape-memory (SM) characterization reveals modest anisotropy in the shape fixing ratios (Rf), yet seemingly isotropic shape recovery (Rr) nearing completeness. Such soft, anisotropic materials may be used in laminated composite elastomers. Anisotropic shape-memory elastomeric composites are prepared by electrospinning a web of oriented fibers, followed by the infiltration, and cure of a silicone matrix. The mechanical properties of the composites are found to be strongly anisotropic in a manner similar to bat wing membranes. Shape-memory testing reveals a dependence of the strain-fixing degree on the orientation direction, and excellent shape recovery in all directions.

Original languageEnglish (US)
Pages (from-to)1247-1257
Number of pages11
JournalMacromolecular Chemistry and Physics
Volume214
Issue number11
DOIs
StatePublished - Jun 13 2013

Keywords

  • elastomers
  • mechanical anisotropy
  • shape-memory polymers
  • silicone

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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