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Biomechanical studies on aliphatic physically crosslinked poly(urethane urea) for blood contact applications

Abstract

Hydrophobic and physically crosslinked (virtually crosslinked through hydrogen bonding) aliphatic poly(urethane urea)s were developed and characterized for its biomechanical properties. The aging under induced-stress (bend samples) condition reveals resistance of poly(urethane urea) to environmental stress corrosion cracking (ESC) in hydrolytic media, Ringer’s solution and phosphate buffered saline at 50°C. The strain-induced (20% tensile strain) and aged polymer in hydrolytic enzyme medium, papain and in buffer reveals increase of elastic modulus in papain enzyme and papain buffer. The increase of elastic modulus is attributed to unidirectional reorganisation of chains under continually strained conditions. The polymer exposed in boiling alcoholic potassium hydroxide solution (accelerated hydrolytic chemical degradation) reveals no degradation. A comparative evaluation of poly(ether urethane urea)s reveals inferior properties. Poly(ether urethane urea)s polymer undergo hydrolytic degradation in boiling alcoholic potassium hydroxide solution. The candidate poly(urethane urea) HFL 18-PUU is more promising elastomer for long-term biomechanically sensitive blood contact applications such as heart valve and blood pump diaphragm of left ventricular assist device.

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Acknowledgements

The authors thank Department of Biotechnology, New Delhi, Government of India for financial assistance. The authors thank Dr. K. Mohandas, Director SCTIMST and Dr. G. S. Bhuvaneshwar, Head, BMT Wing for their support. The authors also thank Dr. Roy Joseph and Dr. P. Ramesh for their assistance for mechanical tests.

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Correspondence to Jayabalan Muthu.

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Thomas, V., Muthu, J. Biomechanical studies on aliphatic physically crosslinked poly(urethane urea) for blood contact applications. J Mater Sci: Mater Med 19, 2721–2733 (2008). https://doi.org/10.1007/s10856-008-3367-8

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  • DOI: https://doi.org/10.1007/s10856-008-3367-8

Keywords

  • Crosslink Density
  • Papain
  • Hard Segment
  • Soft Segment
  • Hard Segment Content