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In vitro degradation and in vivo biocompatibility study of a new linear poly(urethane urea)
Author(s) -
Asplund Basse,
Aulin Cecilia,
Bowden Tim,
Eriksson Niklas,
Mathisen Torbjörn,
Bjursten LarsMagnus,
Hilborn Jöns
Publication year - 2008
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.30986
Subject(s) - biocompatibility , elongation , in vivo , ultimate tensile strength , urea , hydrolysis , nuclear chemistry , polyester , materials science , degradation (telecommunications) , in vitro , biodegradation , polymer chemistry , chemistry , biomedical engineering , composite material , biochemistry , organic chemistry , medicine , telecommunications , microbiology and biotechnology , biology , computer science
Abstract Segmented poly(urethane urea)s (PUUs) with hard segments derived only from methyl 2,6‐diisocyantohexanoate (LDI) without the use of a chain extender have previously been described. These materials, which contain hard segments with multiple urea linkages, show exceptionally high strain capability (1600–4700%). In the study reported here, the rate and effect of hydrolysis of these materials were determined for gamma‐sterilized and nonsterilized samples. Materials investigated contained PCL, PTMC, P(TMC‐ co ‐CL), P(CL‐ co ‐DLLA), or P(TMC‐ co ‐DLLA) as soft segments and, as well as their mechanical properties, changes in mass, inherent viscosity (I.V.), and thermal properties were studied over 20 weeks. Results showed that the degradation rate was dependant on the soft segment structure, with a higher rate of degradation for the polyester‐dominating PUUs exhibiting a substantial loss in I.V. A tendency of reduction of tensile strength and strain hardening was seen for all samples. Also, loss in elongation at break was detected, for PUU‐P(CL‐DLLA) it went from 1600% to 830% in 10 weeks. Gamma radiation caused an initial loss in I.V. and induced more rapid hydrolysis compared with nonsterilized samples, except for PUU‐PTMC. A cytotoxicity test using human fibroblasts demonstrated that the material supports cell viability. In addition, an in vivo biocompatibility study showed a typical foreign body reaction after 1 and 6 weeks. © 2007 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2008