| abstract |
The present invention provides a modified polyamide acid and a preparation method therefor, and a preparation method for a composite film layer. The modified polyamide acid comprises polyamide acid and polyvinylidene fluoride. By introducing the polyvinylidene fluoride having good thermal stability, high dielectric constant, and excellent piezoelectric and ferroelectric properties into the modified polyamide acid, the dielectric constant of the polyamide acid is improved, and the structure adjustability thereof is enhanced. |