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

研究了染料/基材相互作用对有色聚对苯二甲酸乙二酯(PET)薄膜拉伸性能的影响。用菲(AC)及其羟基(OH)衍生物(第I族染料)和蒽醌(AQ)及其羟基衍生物(第II族染料)对PET进行着色。与对照组相比，安曲菌素(I组)和2，6-二羟基蒽醌(II H组)的偏转屈服应力分别增加了16和12 Mpa。退火后，这两个值分别进一步增加了7和5 Mpa。这种增强作用被认为是由于染料和底物之间形成氢键而产生的，而1-羟基蒽醌(II E组)具有增塑作用。染料H的应力松弛速率比对照慢，而染料E的应力松弛速率快。随着薄膜中染料浓度的增加，熔融淬火染料/PET共混体系的熔点(Tm)降低。用Flory方程求出了染料与底物X_1的相互作用参数，表明体系的T_m降低。AC和AQ的X_1值接近于零，而其他染料的X_1值为正值。这些结果表明，大多数染料分子聚集在PET中是因为染料对底物的亲和力不足。然而，这些值几乎取决于染料/底物相互作用的强度。

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.