Copolymer

A copolymer comprising

• a main chain comprising a polymerization unit of an olefin-based monomer;
• a branched chain bound to the main chain and represented by the following Formula 1;
• and
• a branched chain bound to the main chain and represented by the following Formula 2:
• —SiR1lR2(2-l)R3 [Formula 1]
• wherein R1 and R2 each independently represent a halogen, an amine group, —R4R5, or —R5 bound to a silicon atom;
• R4 represents oxygen, or a sulfur atom;
• R5 represents hydrogen, an alkyl group, an aryl group, an aralkyl group, or an acyl group;
• l is an integer of 1 or 2;
• R3 represents —OSiR6mR7(2-m)R8 bound to a silicon atom;
• R6 and R7 each independently represent a halogen, an amine group, —R9R10, or —R10 bound to a silicon atom;
• R9 represents oxygen, or a sulfur atom;
• R10 represents hydrogen, an alkyl group, an aryl group, an aralkyl group, or an acyl group;
• R8 represents —(CH2)nNR11R12 bound to a silicon atom;
• R11 and R12 each independently represent hydrogen, or R13NH2 bound to a nitrogen atom;
• R13 represents an alkylene group;
• m is an integer of 1 or 2;
• and
• n is an integer greater than or equal to 0,
• —SiR14oR15(3-o) [Formula 2]
• wherein R14 and R15 each independently represent a halogen, an amine group, —R16R17, or —R17 bound to a silicon atom;
• R16 represents oxygen, or a sulfur atom;
• R17 represents hydrogen, an alkyl group, an aryl group, an aralkyl group, or an acyl group;
• and
• o is an integer ranging from 1 to 3;
• and
• an unsaturated silane and an aminosilane compound engrafted to the main chain,
• wherein the aminosilane compound is included in an amount of 1 to 40 parts by weight with respect to 100 parts by weight of the silane compound in the copolymer.