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Post-Polymerization Crosslinked Polyurethane Shape-Memory Polymers.

Publication ,  Journal Article
Hearon, K; Gall, K; Ware, T; Maitland, DJ; Bearinger, JP; Wilson, TS
Published in: Journal of applied polymer science
July 2011

Novel urethane shape-memory polymers (SMPs) of significant industrial relevance have been synthesized and characterized. Chemically crosslinked SMPs have traditionally been made in a one-step polymerization of monomers and crosslinking agents. However, these new post-polymerization crosslinked SMPs can be processed into complex shapes by thermoplastic manufacturing methods and later crosslinked by heat exposure or by electron beam irradiation. Several series of linear, olefinic urethane polymers were made from 2-butene-1,4-diol, other saturated diols, and various aliphatic diisocyanates. These thermoplastics were melt-processed into desired geometries and thermally crosslinked at 200°C or radiation crosslinked at 50 kGy. The SMPs were characterized by solvent swelling and extraction, differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), tensile testing, and qualitative shape-recovery analysis. Swelling and DMA results provided concrete evidence of chemical crosslinking, and further characterization revealed that the urethanes had outstanding mechanical properties. Key properties include tailorable transitions between 25 and 80°C, tailorable rubbery moduli between 0.2 and 4.2 MPa, recoverable strains approaching 100%, failure strains of over 500% at T(g), and qualitative shape-recovery times of less than 12 seconds at body temperature (37°C). Because of its outstanding thermo-mechanical properties, one polyurethane was selected for implementation in the design of a complex medical device. These post-polymerization crosslinked urethane SMPs are an industrially relevant class of highly processable shape-memory materials.

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Published In

Journal of applied polymer science

DOI

EISSN

1097-4628

ISSN

0021-8995

Publication Date

July 2011

Volume

121

Issue

1

Start / End Page

144 / 153

Related Subject Headings

  • Polymers
  • 40 Engineering
  • 34 Chemical sciences
  • 09 Engineering
  • 03 Chemical Sciences
 

Citation

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Hearon, K., Gall, K., Ware, T., Maitland, D. J., Bearinger, J. P., & Wilson, T. S. (2011). Post-Polymerization Crosslinked Polyurethane Shape-Memory Polymers. Journal of Applied Polymer Science, 121(1), 144–153. https://doi.org/10.1002/app.33428
Hearon, K., K. Gall, T. Ware, D. J. Maitland, J. P. Bearinger, and T. S. Wilson. “Post-Polymerization Crosslinked Polyurethane Shape-Memory Polymers.Journal of Applied Polymer Science 121, no. 1 (July 2011): 144–53. https://doi.org/10.1002/app.33428.
Hearon K, Gall K, Ware T, Maitland DJ, Bearinger JP, Wilson TS. Post-Polymerization Crosslinked Polyurethane Shape-Memory Polymers. Journal of applied polymer science. 2011 Jul;121(1):144–53.
Hearon, K., et al. “Post-Polymerization Crosslinked Polyurethane Shape-Memory Polymers.Journal of Applied Polymer Science, vol. 121, no. 1, July 2011, pp. 144–53. Epmc, doi:10.1002/app.33428.
Hearon K, Gall K, Ware T, Maitland DJ, Bearinger JP, Wilson TS. Post-Polymerization Crosslinked Polyurethane Shape-Memory Polymers. Journal of applied polymer science. 2011 Jul;121(1):144–153.
Journal cover image

Published In

Journal of applied polymer science

DOI

EISSN

1097-4628

ISSN

0021-8995

Publication Date

July 2011

Volume

121

Issue

1

Start / End Page

144 / 153

Related Subject Headings

  • Polymers
  • 40 Engineering
  • 34 Chemical sciences
  • 09 Engineering
  • 03 Chemical Sciences