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 PLA fiber,and thus render higher dye up-take.
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