Open AccessTimescales of self-healing in human bone tissue and polymeric ionic liquids
Author(s) -
Johanna Akbarzadeh,
S. Puchegger,
Anja Stojanovic,
H. O. K. Kirchner,
Wolfgang H. Binder,
Sigrid Bernstorff,
Peter Zioupos,
Herwig Peterlik
Publication year - 2014
Publication title -
bioinspired biomimetic and nanobiomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.247
H-Index - 12
eISSN - 2045-9866
pISSN - 2045-9858
DOI - 10.1680/bbn.14.00007
Subject(s) - ionic bonding , ionic liquid , relaxation (psychology) , cationic polymerization , dissolution , chemistry , chemical engineering , diffusion , materials science , chemical physics , polymer chemistry , ion , organic chemistry , thermodynamics , social psychology , psychology , physics , engineering , catalysis
Strain (stress-free) relaxation in mechanically prestrained bone has a time constant of 75 s. It occurs by a reorganization of the proteoglycan-glycoprotein matrix between collagen fibers, which requires ionic interactions. Dissolving and relinking the ionic bonds is thus an important tool of nature to enable plastic deformation and to develop self-healing tissues. A way to transfer this approach to technical materials is the attachment of ionic end groups to polymeric chains. In these classes of materials, the so-called polymeric ionic liquids, structural recovery of thermally disorganized material is observed. A time constant between minutes and a week could be achieved, also by ionic rearrangement. The same mechanism, rearrangement of ionic bonds, can lead to vastly different relaxation times when the ionic interaction is varied by exchange of the cationic end groups or the anions.
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