Prod. No. 1648
Over-dyeing phenomenon and dichroism of dyed polymer†
Article first published online: 9 MAR 2003
Copyright © 1967 John Wiley & Sons, Inc.
Journal of Applied Polymer Science
Volume 11, Issue 12, pages 2533–2542, December 1967
How to Cite
Kobayashi, Y., Okajima, S. and Nakayama, K. (1967), Over-dyeing phenomenon and dichroism of dyed polymer. J. Appl. Polym. Sci., 11: 2533–2542. doi: 10.1002/app.1967.070111213
- Issue published online: 9 MAR 2003
- Article first published online: 9 MAR 2003
- Manuscript Received: 25 APR 1967
Visible dichroism reflects the orientation of the amorphous region of a polymer. Thus the dichroism of a polymer must be constant irrespective of the amount of dye on the polymer. It is generally believed, however, that a fiber specimen must not be over-dyed if the dichroism is to be measured quantitatively. The dichroism of cellulose and poly(vinyl alcohol) dyed with Congo Red was measured carefully, and the causes of this phenomenon were investigated. The “over-dyeing” phenomenon is apparent. When the correct absorbance is measured, Lambert-Beer's law holds good over the range of the possible dye content. The orientation of the dye molecules in polymer is independent of the dye content up to saturation.