Polyamide combination film prepared by using same, and display device including the film

1. A polyamide combination comprising:

a first polyamide comprising (i) a structure unit represented by Chemical Formula 2, and (ii) a structure unit represented by Chemical Formula 3; and

a second polyamide (i) consisting of a structure unit represented by Chemical Formula 3,

wherein, in Chemical Formula 2,

R 5 is the same or different in each structure unit, and each R 5 is independently a substituted or unsubstituted C6 to C30 aromatic organic group,

R 6 and R 7 are the same or different and are each independently an electron withdrawing group,

R 8 and R 9 are the same or different and are each independently a halogen, a hydroxyl group, an ether group (—OR 204 , wherein R 204 is a C1 to C10 aliphatic organic group), a silyl group (—SiR 205 R 206 R 207 , wherein R 205 , R 206 , and R 207 are the same or different and are each independently hydrogen or a C1 to C10 aliphatic organic group), a substituted or unsubstituted C1 to C10 aliphatic organic group, or a C6 to C20 aromatic organic group,

n3 is an integer ranging from 1 to 4, n5 is an integer ranging from 0 to 3, n3+n5 is an integer of 1 to 4,

n4 is an integer ranging from 1 to 4, n6 is an integer ranging from 0 to 3, and n4+n6 is an integer of 1 to 4,

wherein, in Chemical Formula 3,

R 10 is the same or different in each structure unit, and each R 10 is independently a noncyclic Si-containing group, a noncyclic P-containing group, a S-containing group, a halogen-substituted C1 to C10 aliphatic organic group, or a noncyclic ether bond (—O—)-containing group,

R 11 is the same or different in each structure unit, and each R 11 is independently a substituted or unsubstituted C6 to C30 aromatic organic group,

R 12 and R 13 are the same or different in each structure unit and are each independently a single bond or a substituted or unsubstituted C6 to C20 aromatic organic group,

R 14 and R 15 are the same or different and are each independently a halogen, a hydroxyl group, an ether group (—OR 200 , wherein R 200 is a C1 to C10 aliphatic organic group), a silyl group (—SiR 201 R 202 R 203 , wherein R 201 , R 202 , and R 203 are the same or different, and are each independently hydrogen or a C1 to C10 aliphatic organic group), a substituted or unsubstituted C1 to C10 aliphatic organic group, or a C6 to C20 aromatic organic group, and

n7 and n8 are each independently integers ranging from 0 to 4,

wherein the electron withdrawing group is —CF 3 , —CCl 3 , —CBr 3 , —CI 3 , —F, —Cl, —Br, —I, —NO 2 , —CN, —COCH 3 , or —CO 2 C 2 H 5 ,

wherein the first polyamide comprises the structure unit represented by Chemical Formula 2 in an amount of from about 10 mol % to about 30 mol % based on the total moles of the structure units of the first polyamide,

wherein the first polyamide has a weight average molecular weight (Mw) of from about 101,000 g/mol to about 176,000 g/mol,

and wherein the first polyamide and the second polyamide are included at a weight ratio of the first polyamide to the second polyamide of from about 20:80 to about 30:70.

2. The polyamide combination of claim 1 , wherein R 10 is —SO 2 —, —O—, —C(CF 3 ) 2 —, —C(CCl 3 ) 2 —, —C(CBr 3 ) 2 —, —CF 2 —, CCl 2 —, or —CBr 2 —.

3. The polyamide combination of claim 1 , wherein R 12 and R 13 are the same or different and are each independently a single bond, -Ph-, —O-Ph-, or —C(CF 3 ) 2 -Ph-, wherein Ph is a phenylene group.

4. The polyamide combination of claim 1 , wherein R 5 , and R 11 are the same or different and are each independently selected from the group consisting of the following chemical formulae:

wherein, in the chemical formulae,

R 16 to R 27 are the same or different and are each independently a halogen, a substituted or unsubstituted C1 to C10 aliphatic organic group, or a substituted or unsubstituted C6 to C20 aromatic organic group,

n7 and n10 to n16 are each independently integers ranging from 0 to 4, and

n8 and n9 are each independently integers ranging from 0 to 3,

provided that the number of carbon atoms in each of the chemical formulae does not exceed 30 carbon atoms.

5. The polyamide combination of claim 4 , wherein R 5 , and R 11 are the same or different and are each independently selected from the group consisting of the following chemical formulae:

6. The polyamide combination of claim 1 , wherein the first polyamide comprises the structure unit represented by Chemical Formula 2 in an amount of about 30 mol % based on the total moles of structure units of the first polyamide.

7. The polyamide combination of claim 1 , wherein the second polyamide has a weight average molecular weight (Mw) of about 20,000 g/mol to about 400,000 g/mol.

8. The polyamide combination of claim 1 , wherein the polyamide combination has a total light transmittance at a wavelength range of about 380 nm to about 700 nm of about 80% or more.

9. The polyamide combination of claim 1 , wherein the polyamide combination has a light transmittance at a wavelength of about 400 nm of about 60% or more.

10. The polyamide combination of claim 1 , wherein

the structure unit represented by Chemical Formula 2 is a reaction product of 2,2′-bis(trifluoromethyl)benzidine and a carboxylic acid dichloride selected from the group consisting of terephthaloyl chloride and isophthaloyl chloride, and

the structure unit represented by Chemical Formula 3 is a reaction product of a diamine selected from the group consisting of 4,4′-diaminodiphenyl sulfone and bis[4-(4-aminophenoxy)phenyl]sulfone and a carboxylic acid dichloride selected from the group consisting of terephthaloyl chloride and isophthaloyl chloride.

11. A film prepared using the polyamide combination according to claim 1 .

12. The film of claim 11 , wherein the film has a coefficient of thermal expansion from about 10 ppm/° C. to about 30 ppm/° C.

13. A display device comprising the film according to claim 11 .