Dyeing behavior of Technora
®, a p-aramid fiber, after treatment with organic solvents was studied. By treating with dimethyl sulfoxide (DMSO), the fiber shrinkage increased as a result of disorientation of the chains in amorphous region. Appreciable effects were not found with other solvents such as dimethyl formamide (DMF) and dimethyl acetamide (DMAC). Disperse dye (C. I. Disperse Red 60) uptake on Technora
® was markedly increased by treating with DMSO under free length. Under constant length treatment, the increase in the dye uptake was much reduced. Dichroism of the dyed Technora
® decreased from 0.6 to 0.33 when the fiber was treated with DMSO under free length at the temperatures 80 to 140°C. From the above results, it is concluded that fiber orientation in the amorphous region of Technora
® is markedly relaxed by treatment with DMSO.
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