Typical Fracture Appearance of Broken Wool Fibers After Simulated Sunlight Irradiation

Abstract

After determining the wet bundle strength of sunlight irradiated wool, the broken fiber ends are evaluated optically by electron microscope. Three different modes of fiber fracture are identified. Due to the breakage morphology, we assume that the histological wool components are damaged to a different extent as a function of ir radiation time. Thus, the frequency of the breakage modes may serve to indicate the stage of fiber damage. We suppose that the initial step of photodamage is the pho tooxidation of the internal lipids, because they are obviously modified after a very short time of irradiation, while the keratin components are visibly intact. After long irradiation periods, the fibrous structure of the keratin fibrils is no longer recognizable.

References

Curzio, M. , Poli, G. , Esterbauer, H. , Di Mauro, C. , and Dianzani, M.U. , Detection of Carbonyl Products of Lipid Peroxidation in Rat Pleural Exsudat , IRCS Med. Sci. 14, 984-985 (1986).

Dobb, M.G. , and Murray, R. , Aspects of Keratin Struc. ture, in "Proc. 5th Int. Wool Text. Res. Conf. Aachen, vol. II, 1976, pp. I-II.

Evans, D.J. , Russel, I. M. , and Jones, L.N. , Osmium Staining of Beta-Layers Within the Cell Membrane Complex of Wool Butadiene Copolymers, Textile Res. J. 54 (10), 696-698 (1984).

Feldtman, H.D. , and Leeder, J.D. , Effects of Polar Organic Solvents on the Abrasion Resistence of Wool Fabric, Textile Res. J. 54 (1), 26-31 (1984).

Herrling, J. , Textile Chemical Concernings of the Cdl Membrane Complex of Wool (in German), Masters thesis, RWTH Aachen, 1981.

Holt, L.A. , and Milligan. B. , The Formation of Carbonyl Groups During Irradiation of Wool and Its Relation to Photoyellowing, Textile Res. J. 47 (9), 620-624 (1977).

Kappus, H. , Lipid Peroxidation: Mechanism, Analysis, Enzymology and Biological Relevance, in "Oxidative Stress," H. Sies , Ed., Academic Press, NY, 1985, pp. 273-310.

Lee, J.S. , and Finkner, M.D. , Some Physical Properties of Weathered Wool, Textile Res. J. 37 (3), 210-220 (1967).

Logani, M.K. , and Davies, R.E. , Lipid Oxidation : Biologic Effect and Antioxidants—A Review, Lipids 15 (6), 485-495 (1980).

10.

Maclaren, J.A. , and Milligan, B. , "Wool Science: The Chemical Reactivity of the Wool Fiber," Science Press. Marrickville, Australia, 1981.

11.

Nielsen, H. , Covalent Binding of Peroxidized Phospholipid to Protein, III: Reaction of Individual Phospholipids with Different Proteins , Lipids 16 (4), 215-222 ( 1981).

12.

Orwin, D.F.G. , and Thomson, R.W.J. , The Electron Microscopy of Two Types of Fibre Damage and its Relationship to Some Cell Components, in "Proc. 5th Int. Wool Text. Res. Conf., Aachen," vol. II, 1976, pp. 173-183.

13.

Orwin, D.F.G. , Woods, J.L. , and Gourdie, R.G. , Cortical Cell Type and Wool Strength, in "Proc. 7th Int. Wool Text. Res. Conf., Tokyo," vol. 1, 1985, pp. 194-203.

14.

Röper. K. , and Finnimore, E. , Chemical Structure of Chromophores Formed During Photoyellowing of Wool, in "Proc. 7th Int. Wool Text. Res. Conf., Tokyo," vol. IV, 1985, pp. 21-30.

15.

Roubal, W.T. , and Tappel, A.L. , Damage to Proteins, Enzymes, and Amino Acids by Peroxidizing Lipids, Arch. Biochem. Biophys. 113, 5-8 ( 1966).

16.

Schäfer, K. , the Protection of Wool against Photoyellowing , Melliand Textilber. 69 (7), 520-524 (1988).

17.

Schwan, A. :, Herrling, J., and Zahn, H., Characterization of Internal Lipids from Wool , Colloid Polym. Sci., 264, 171-175 ( 1986).

18.

Weatherall, L. , The Tendering of Wool by Light, in "Proc. 5th Int. Wool Text. Res. Conf., Aachen," vol. II, 1976, pp. 580-589.

19.

Zimmermann, M. , Internal Lipids of Wool: Photooxidative Induced Alterations and Their Effect on the Wool Fiber (in German), Doctoral thesis, RWTH Aachen, 1989.