Block copolymer composition

1. A block copolymer composition, comprising:

a diblock copolymer and a triblock copolymer, wherein each include a polyolefin-based block and a polystyrene-based block,

wherein the polyolefin-based blocks of the diblock and the triblock copolymers are present between 45 wt % to 90 wt %, and the polystyrene-based blocks of the diblock and the triblock copolymers are present between 10 wt % to 55 wt %, based on the total weight of the block copolymer composition,

wherein a difference (ΔT) between a thermal decomposition initiation temperature and a thermal decomposition termination temperature, measured by Thermo-Gravimetric Analysis (TGA), is 55° C. or greater,

wherein the diblock copolymer and the triblock copolymer do not have a residual unsaturated bond therein, and

wherein the block copolymer composition has weight average molecular weight (Mw) of 60,000 g/mol to 120,000 g/mol.

2. The block copolymer composition of claim 1 , wherein the polyolefin-based block comprises a repeating unit derived from ethylene and a repeating unit derived from alpha-olefin, and the polyolefin-based block comprises the repeating unit derived from ethylene in an amount of 40 wt % to 60 wt % and the repeating unit derived from alpha-olefin in an amount of 10 wt % to 35 wt % based on the total weight of block copolymer composition.

3. The block copolymer composition of claim 1 , wherein the polyolefin-based block comprises a repeating unit represented by Formula 1 below:

in Formula 1 above,

R 1 is hydrogen, alkyl having 1 to 20 carbon atoms, alkyl having 1 to 20 carbon atoms substituted with silyl, arylalkyl having 7 to 20 carbon atoms, or arylalkyl having 7 to 20 carbon atoms substituted with silyl, and

n is an integer of 10 to 10,000.

4. The block copolymer composition of claim 2 , wherein the polyolefin-based block comprises a repeating unit represented by Formula 2 below:

in Formula 2 above,

R 1 ′ and R 1 ″ are each independently hydrogen, alkyl having 1 to 20 carbon atoms, alkyl having 1 to 20 carbon atoms substituted with silyl, arylalkyl having 7 to 20 carbon atoms, or arylalkyl having 7 to 20 carbon atoms substituted with silyl, wherein R 1 ′ and R 1 ″ are different from each other,

0<p<1, and

n′ is an integer of 10 to 10,000.

5. The block copolymer composition of claim 1 , wherein the polystyrene-based block comprises a repeating unit represented by Formula 6 below and a repeating unit represented by Formula 9 below:

in the formulas above,

R 2 and R 3 are aryl having 6 to 20 carbon atoms, or aryl having 6 to 20 carbon atoms substituted with halogen, alkyl having 1 to 12 carbon atoms, cycloalkyl having 3 to 12 carbon atoms, alkoxy having 1 to 8 carbon atoms or aryl having 6 to 12 carbon atoms, and

1 and m are each independently an integer of 10 to 1,000.

6. The block copolymer composition of claim 5 , wherein R 2 and R 3 are each independently phenyl, or phenyl substituted or unsubstituted with halogen, alkyl having 1 to 8 carbon atoms, cycloalkyl having 3 to 12 carbon atoms, alkoxy having 1 to 8 carbon atoms or aryl having 6 to 12 carbon atoms.

7. The block copolymer composition of claim 1 , wherein the triblock copolymer comprises a first block including one or more kinds of repeating units represented by Formula 1 below, a second block including a repeating unit represented by Formula 6 below, and a third block including a repeating unit represented by Formula 9 below:

in the formulas above,

R 1 is hydrogen, alkyl having 1 to 20 carbon atoms, alkyl having 1 to 20 carbon atoms substituted with silyl, arylalkyl having 7 to 20 carbon atoms, or arylalkyl having 7 to 20 carbon atoms substituted with silyl,

R 2 and R 3 are aryl having 6 to 20 carbon atoms, or aryl having 6 to 20 carbon atoms substituted with halogen, alkyl having 1 to 12 carbon atoms, cycloalkyl having 3 to 12 carbon atoms, alkoxy having 1 to 8 carbon atoms or aryl having 6 to 12 carbon atoms,

n is an integer of 10 to 10,000, and

1 and m are each independently an integer of 10 to 1,000.

8. The block copolymer composition of claim 7 , comprising a composite block represented by Formula 8 below, the composite block formed by coupling the first block including a repeating unit of Formula 1 above and the second block including a repeating unit of Formula 6:

in Formula 8 above,

R 1 ′ and R 1 ″ are each independently hydrogen, alkyl having 1 to 20 carbon atoms, alkyl having 1 to 20 carbon atoms substituted with silyl, arylalkyl having 7 to 20 carbon atoms, or arylalkyl having 7 to 20 carbon atoms substituted with silyl, wherein R 1 ′ and R 1 ″ are different from each other,

R 2 is aryl having 6 to 20 carbon atoms, or aryl having 6 to 20 carbon atoms substituted with halogen, alkyl having 1 to 12 carbon atoms, cycloalkyl having 3 to 12 carbon atoms, alkoxy having 1 to 8 carbon atoms or aryl having 6 to 12 carbon atoms,

0<p<1,

n′ is an integer of 10 to 10,000, and

1 is an integer of 10 to 1,000.

9. The block copolymer composition of claim 7 , comprising a structure represented by Formula 13 below:

in Formula 13 above,

R 1 ′ and R 1 ″ are each independently hydrogen, alkyl having 1 to 20 carbon atoms, alkyl having 1 to 20 carbon atoms substituted with silyl, arylalkyl having 7 to 20 carbon atoms, or arylalkyl having 7 to 20 carbon atoms substituted with silyl, wherein R 1 ′ and R 1 ″ are different from each other,

R 2 and R 3 are each independently aryl having 6 to 20 carbon atoms, or aryl having 6 to 20 carbon atoms substituted with halogen, alkyl having 1 to 12 carbon atoms, cycloalkyl having 3 to 12 carbon atoms, alkoxy having 1 to 8 carbon atoms or aryl having 6 to 12 carbon atoms,

0<p<1,

n′ is an integer of 10 to 10,000, and

1 and m are each independently an integer of 10 to 1,000, and

a is an integer of 1 to 50.

10. The block copolymer composition of claim 1 , comprising 19 wt % or less of the diblock copolymer.

11. The block copolymer composition of claim 1 , wherein a polydispersity index (PDI) of 1.4 to 2.0.

12. The block copolymer composition of claim 1 , wherein the block copolymer composition has a weight average molecular weight (Mw) thereof of 60,000 g/mol to 100,000 g/mol.

13. The block copolymer composition of claim 1 , wherein ΔT is 55° C. to 70° C.

14. The block copolymer composition of claim 1 , wherein ΔT is 57° C. to 65° C.

15. The block copolymer composition of claim 1 , wherein the thermal decomposition termination temperature is 440° C. to 470° C. and the thermal decomposition initiation temperature is 385° C. to 405° C.