Poly(amide-imide) copolymer, composition and polymer film comprising thereof
The present disclosure relates to a poly(amide-imide) copolymer in which each of at least one of imide repeating units and at least one of amide repeating units is substituted with a functional group including Chemical Formula 1, wherein, R 1 is hydrogen or an alkyl group having 1 to 10 carbon atoms, and L is a single bond or an alkylene having 1 to 10 carbon atoms, and a composition and a polymer film comprising the same.
1. A polymer film comprising a cured product of a poly(amide-imide) copolymer comprising imide repeating units and amide repeating units,
wherein at least one of the imide repeating units is substituted with a functional group including Chemical Formula 1 and at least one of the amide repeating units is substituted with a functional group including Chemical Formula 1,
wherein the imide and amide repeating units each substituted with a functional group including Chemical Formula 1 are contained in an amount of 5 to 40 parts by mol based on 100 parts by mol of the whole repeating units of the poly(amide-imide) copolymer, and
wherein the polymer film has a yellow index of 1.61 to 1.72 measured according to ASTM D1925 based on a thickness of 50±2 μm, a glass transition temperature of 185° C. to 193° C. measured using a TMA IC600 device, and a modulus of 4.08 GPa to 4.21 GPa measured using DMA 9800 based on a thickness of 50±2 μm:
wherein,
R 1 is hydrogen or an alkyl group having 1 to 10 carbon atoms, and
L is a single bond or an alkylene having 1 to 10 carbon atoms.
2. The polymer film of claim 1 , wherein
R 1 is hydrogen or methyl.
3. The polymer film of claim 1 , wherein
L is an alkylene having 1 to 5 carbon atoms.
4. The polymer film of claim 1 , wherein
the at least one of the imide repeating units includes any one selected from the group consisting of a first repeating unit represented by Chemical Formula 2-1 and a second repeating unit represented by Chemical Formula 2-2:
wherein, in the Chemical Formulae 2-1 and 2-2,
X 1 is a tetravalent organic group,
R 2 to R 4 are each independently hydrogen; a hydroxy group; an alkyl group having 1 to 10 carbon atoms; or the functional group including the Chemical Formula 1,
Q 1 is a single bond, —O—, —S—, —C(═O)—, —CH(OH)—, —S(═O) 2 —, —Si(CH 3 ) 2 —, —(CH 2 )p- (where 1≤p≤10), —(CF 2 )q- (where 1≤q≤10), —C(CH 3 ) 2 —, —C(CF 3 ) 2 — or —C(═O)NH—, and
a, b, and c are each independently an integer of 1 to 4.
5. The polymer film of claim 1 , wherein
the at least one of the amide repeating units includes any one selected from the group consisting of a third repeating unit represented by Chemical Formula 3-1 and a fourth repeating unit represented by Chemical Formula 3-2:
wherein, in the Chemical Formulae 3-1 and 3-2,
X 2 is an arylene group having 6 to 30 carbon atoms,
R 5 and R 6 are each independently hydrogen, or an alkyl group having 1 to 10 carbon atoms,
R 7 to R 9 are each independently hydrogen; a hydroxyl group; an alkyl group having 1 to 10 carbon atoms; or the functional group including the Chemical Formula 1,
Q 2 is a single bond, —O—, —S—, —C(═O)—, —CH(OH)—, —S(═O) 2 —, —Si(CH 3 ) 2 —, —(CH 2 )p- (where 1≤p≤10), —(CF 2 )q- (where 1≤q≤10), —C(CH 3 ) 2 —, —C(CF 3 ) 2 — or —C(═O)NH—, and
d, e and f are each independently an integer of 1 to 4.
6. The polymer film of claim 4 , wherein
X 1 is any one group selected from the groups represented by the following structural formulae:
7. The polymer film of claim 5 , wherein
X 2 is any one group selected from the groups represented by the following structural formulae:
8. The polymer film of claim 1 , wherein
a molar ratio of the imide repeating units and the amide repeating units is 10:90 to 90:10.
9. The polymer film of claim 1 , wherein
a weight average molecular weight of the poly(amide-imide) copolymer is 5,000 to 300,000 g/mol.
10. The polymer film of claim 1 , wherein
the polymer film has a haze measured according to ASTM D1003 is 2% or less.
11. A method for producing the polymer film of claim 1 comprising the steps of: coating a composition comprising the poly(amide-imide) copolymer onto a substrate and curing the coated composition at a temperature of 200° C. or less.
12. The method of claim 11 , wherein the composition further comprises a photoinitiator.
13. The method of claim 11 , wherein the composition further comprises a polyfunctional (meth)acrylate monomer.