The mechanical properties of undyed (treated under conditions identical to those of dyeing) and dyed polyester fibers, dyed with PNA (a model disperse dye), C.I. Disperse Yellow I, and Red 17 were investigated. It was observed that the presence of these dyes causes perceptible changes in the mechanical behavior of the fibers. While PNA (model dye) acts as a plasticizer, the disperse dyes cause hindrance to the movement of the molecular chains of the polymer..
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