Affiliation:
1. USDA, Western Regional Research Center, Albany, California 94710, U.S.A.
Abstract
The keratin in wool is a highly crosslinked protein. The high molecular weight, crosslinked structure prevents its shaping into films without extensive decomposition. Since the crosslinks are —S—S— bridges, reducing agents can break them up. resulting temporarily in lower molecular weight polymers. In this work, wool fibers are pretreated with an aqueous solution of various reducing agents to open the disulfide bonds, and then pressed into films at 130-150°C and pressures of 41.7-66.7 MPa in a hydraulic press. The optimum conditions to obtain clear, transparent films include using Na2SO3 in aqueous alcohol solutions before pressing 135°C and 55.6 MPa.
Subject
Polymers and Plastics,Chemical Engineering (miscellaneous)
Reference6 articles.
1. On the Formation of Yuba-like Film from Chicken Feather and Wool
2. Mercer, E.H. "Keratin and Keratization," Pergamon Press, NY, 1961, p. 1-52.
3. Morton, W.E. , and Hearle, J.W.S. "Physical Properties of Textile Fibers ," The Textile Institute, Manchester . U.K. 1978 , p. 282.
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24 articles.
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