EFFECT OF DYE/POLYMER INTERACTION ON THE TENSILE PROPERTIES OF DYED POLY (ETHYLENE TEREPHTHALATE)

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The effect of dye/substrate interaction on the tensile properties of colored poly (ethylene terephthalate) (PET) film was examined. PET was colored with anthracene (AC) and its hydroxyl (OH) derivatives (Group I dyes) as well as with anthraquinone (AQ) and its OH derivatives (Group II dyes). The offset yield stress of PET colored with anthratobin (Group I) and with 2,6-dihydroxyanthraquinone (Group II H) increased by 16 and 12 MPa, respectively more than the control. After annealing, the values increased further by 7 and 5 MPa, respectively. This reinforcing effect is thought to arise from the formation of hydrogen bondings between dye and substrate, while 1-hydroxyanthraquinone (Group II E) has a plasticizing effect. The dye H has a slower stress-relaxation rate than the control, whereas the dye E has a faster rate. As the dye concentration in the films increased, the melting points (T_m) of melt-quenched dye/PET mixed systems were depressed. The interaction parameter between dye and substrate X_1 was obtained using Flory's equation which showed T_m depression of the systems. The values of X_1 of AC and AQ were approximately zero, but other dyes had positive values. These results suggest that most of dye molecules aggregate in PET because the affinity of dyes for the substrate is inadequate. However, the values are almost dependent on the strength of the dye/substrate interaction.