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Models for multiple relaxation processes in collagen fiber
Two element model suits best the dimensional relaxation processes, of which one event appears to originate from stress strain induced changes in hydrogen bond network whereas the other seems to be more strongly coupled to salt like bridges and electrostatic interactions. Urea alters the activation energy for one relaxation step while pH and solvent dielectric constant alter the relaxation behavior one set of processes.
In other words, collagen derives its dimensional stability from secondary and intermolecular non-covalent interactions significantly.
Where the pre-exponential term A is temperature dependent, Eo is activation energy at absolute zero and m is a constant
Activation energy measurements for various dimensional relaxation steps indicate a multiple site interactions. Pre-exponential factors in activation exhibit unusual dependence on temperature.