Abstract
Acrylic fibres, coloured by inert thermal-treatments up to 573K are highly pleochroic. The preferred absorption is parallel to the fibre axis, implying that the chromophore is a molecular sequence intrinsically part of the oriented polymer chain. The biabsorption, k∥-k⊥, shows a direct correlation with amount of nitrile reacted in the polymer. Although the development of chromophore is directly related to polymerization of nitriles, the polymerized nitrile sequences themselves may not necessarily be the specific chromophore.
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