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The cis-trans isomerization of 4-N,N-diethylaminoazobenzene dispersed in two polyamidic fibers has been studied. The fibers were obtained by blending polyamide 6 with appropriate amounts of an aromatic copolyamide, which allowed a controlled enhancement of the T g value of the polyamide. The different fastness properties of the dyed materials could be explained in terms of the observed different...
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