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Viscoelastic behavior of formaldehyde and basic chromium sulfate‐crosslinked collagen
Author(s) -
Ramamoorthy Usha,
Subramanian V.,
Ramasami T.
Publication year - 1999
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19990328)71:13<2245::aid-app15>3.0.co;2-i
Subject(s) - viscoelasticity , activation energy , stress relaxation , relaxation (psychology) , formaldehyde , reaction rate constant , covalent bond , chemistry , polymer chemistry , chromium , materials science , kinetics , composite material , physics , organic chemistry , psychology , social psychology , creep , quantum mechanics
Rat tail tendon (RTT) collagen has been crosslinked with 1% basic chromium sulfate (BCS) at pH 3.2, and 2, 4, 8, and 10% formaldehyde (HCHO) at pH 5 and pH 8. The viscoelastic behavior (such as stress relaxation behavior for BCS and HCHO‐tanned RTT) has been studied in water and 6 M urea at different temperatures. The total rate of relaxation has been divided into fast and slow components, and computed using the two‐term model and nonlinear least‐squares fit. The rate of relaxation for crosslinked RTT is less than the native one. Activation energy at absolute zero has been computed using k = AT m e − E 0/ RT and nonlinear least‐squares fit. The activation energy increases for crosslinked RTT than the native one. This is consistent with the observed rate constant values. This may be due to the additional stability imparted to RTT collagen by coordinate covalent and covalent crosslinks through BCS and HCHO, respectively. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 71: 2245–2251, 1999