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Journal of Materials Science

, Volume 52, Issue 23, pp 13669–13680 | Cite as

Unidirectional freezing as a tool for tailoring air permeability in macroporous poly(ethylene glycol)-based cross-linked networks

  • Walter F. Schroeder
  • Roberto J. J. Williams
  • Cristina E. Hoppe
  • Hernán E. Romeo
Polymers

Abstract

Unidirectional freezing followed by photopolymerization at subzero temperatures was used to obtain highly air-permeable monoliths with ordered porous structures. Scaffolds were obtained from aqueous solutions of a poly(ethylene glycol)dimethacrylate (PEGDMA) oligomer, a photosensitizer and a reducing agent. Solutions were vertically frozen in liquid nitrogen at a controlled rate to induce the oriented growth of ice crystals and then cryo-photopolymerized under blue-light irradiation. Ice crystals were finally removed under vacuum producing macroporous hydrophilic networks with aligned pores. Porosities ranged between 80 and 95%, depending on the initial concentration of PEGDMA. The influence of processing variables on the final properties of the materials was addressed, concerning particularly the effect of porosity and freezing directionality on air permeability. Compared to porous PEGDMA-based monoliths with non-aligned macropores, gas permeability was two to three times higher for oriented scaffolds at the same porosity level, a fact explained by the easier transport of gas molecules through the aligned structures. However, the role of pore orientation on gas permeability was shown to be less marked as porosity increased. The results demonstrate that the use of unidirectional freezing strongly increases the permeability of monolithic samples up to values usually required, for instance, in tissue engineering applications (higher than 2D). These findings provide new perspectives on pore design principles toward future scaffolding of polymeric cross-linked matrices.

Notes

Acknowledgements

The financial support of the following institutions is gratefully acknowledged: National Research Council (CONICET), National Agency for the Promotion of Science and Technology (ANPCyT, Argentina, PICT012-2235 and PICT10-1008) and University of Mar del Plata (15/G374).

Compliance with ethical standards

Conflict of interest

Authors declare no conflicts of interest for this work.

Supplementary material

10853_2017_1460_MOESM1_ESM.pdf (401 kb)
Supplementary material 1 (PDF 401 kb)

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Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  1. 1.Institute of Materials Science and Technology (INTEMA)University of Mar del Plata (UNMdP) and National Research Council (CONICET)Mar del PlataArgentina

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