| abstract |
Polyamide-imide block copolymers, a preparation method thereof and a polyamide-imide film comprising the same are provided. The polyamide-imide block copolymer comprises a first repeat unit represented by the following Chemical Formula 1, a second repeat unit represented by the following Chemical Formula 2 and a third repeat unit represented by the following Chemical Formula 3. In Chemical Formulae 1 to 3, the definition of each substituents is the same as the detail description of the specification. The polyamide-imide block copolymer according to the present invention makes it possible to provide a polyamide-imide film having excellent thermal stability and chemical resistance and, at the same time, having excellent mechanical properties. |