ISSN:
0887-6266
Keywords:
collagen
;
surfactants
;
calorimetry
;
segment-long-spacing
;
anionic
;
titration
;
sodium lauryl sulfate
;
castor oil
;
Physics
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Leather, a textile based on collagen, usually requires the addition of sulfated oils that have been recently found to cause instability when heated in critical manufacturing processes. Here reactions between collagen and sodium dodecyl sulfate (SDS), sulfated castor oil, or a synthetic sulfated oil are studied calorimetrically. Sodium lauryl sulfate below its critical micelle concentration (cmc) displayed an immediate exotherm due to equilibrium binding of the reagents with stoichiometry n = 12.6 ± 0.2, K = (2.02 ± 0.8) × 107 M-1, and enthalpy ΔH = 62 ± 2 Kcal/mol; and a delayed endotherm due to denaturation of collagen. The endotherms accompanying the reactions with sulfated oils with longer chains were smaller, with no apparent denaturation of collagen. The micellar nature of these surfactants was apparent from very large n for sulfated castor oil, 4082 ± 11 and a very small value of ΔH, 0.77 ± 0.01 cal/mol. The binding of sulfated castor oil at the polar bands of collagen crystallites, comprising extended molecules arranged side-by-side, was shown directly by electron microscopy. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 805-813, 1998
Additional Material:
8 Ill.
Type of Medium:
Electronic Resource
