I'm not an expert in this area, but there is very highly-cited review paper that might shed some light on your question:

C Yan and DJ Pochan (2010) Rheological properties of peptide-based hydrogels for biomedical and other applications. CHEMICAL SOCIETY REVIEWS 39(9) 3528-3540.

in particular, this part of the abstract seems relevant: "A fundamental understanding of peptide hydrogel mechanical properties and underlying molecular mechanisms is crucial....we cover the literature containing rheological characterization of the physical properties of peptide and polypeptide-based hydrogels including..."

thank you very much Michael, the abstract seems interesting and full of desired information. Will it be possible for you to send the full paper to me (email id: [email protected]) as the particular journal is not available from my side.

the paper seems to be freely available from the NIH PMC full text archive:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3104857/

thanks Michael