Study on dyeing properties of PLA fiber with disperse dyes

The glass transition temperature was known through the measurement of DSC scan o f PLA fiber.The curve reflected the relation between the dye up-take and dyeing temperature for three disperse dyes with different chemi cal structure, the results show that the optimum temperature of dyeing is 110 ℃.In addition, based on the dyeing characteristic of PLA fiber with 12 kinds of disperse dyes,i t can be concluded that the molecules is too small or there are too much polar g roup in dye molecule,both aren't favorable to dyeing. On the other hand,the pre se nce of acetate group seems to be beneficial to increase affinity of dye for P LA fiber,and thus render higher dye up-take.