Modified conjugated diene-based polymer, method for preparing the same and rubber composition including the same

A modified conjugated diene-based polymer comprising:

• a first chain consisting of a repeating unit derived from a conjugated diene-based monomer, or a repeating unit derived from a conjugated diene-based monomer and a repeating unit derived from an aromatic vinyl-based monomer;
• a second chain comprising a repeating unit derived from a compound represented by Formula 1;
• and a derived unit from an alkoxysilane-based modifier,
• wherein the first chain and the second chain are coupled by the derived unit from the alkoxysilane-based modifier:
• in Formula 1,
• R1a to R1c are each independently a hydrogen atom;
• an alkyl group of 1 to 20 carbon atoms;
• an alkenyl group of 2 to 20 carbon atoms;
• an alkynyl group of 2 to 20 carbon atoms;
• a heteroalkyl group of 1 to 20 carbon atoms, a heteroalkenyl group of 2 to 20 carbon atoms;
• a heteroalkynyl group of 2 to 20 carbon atoms;
• a cycloalkyl group of 5 to 20 carbon atoms;
• an aryl group of 6 to 20 carbon atoms;
• or a heterocyclic group of 3 to 20 carbon atoms,
• R1d is a single bond, or an alkylene group of 1 to 20 carbon atoms;
• a cycloalkylene group of 5 to 20 carbon atoms;
• or an arylene group of 6 to 20 carbon atoms, each of which is unsubstituted or substituted with an alkyl group of 1 to 10 carbon atoms, a cycloalkyl group of 5 to 10 carbon atoms, or an aryl group of 6 to 20 carbon atoms, and
• R1e is an alkyl group of 1 to 20 carbon atoms;
• an alkenyl group of 2 to 20 carbon atoms;
• an alkynyl group of 2 to 20 carbon atoms;
• a heteroalkyl group of 1 to 20 carbon atoms;
• a heteroalkenyl group of 2 to 20 carbon atoms;
• a heteroalkynyl group of 2 to 20 carbon atoms;
• a cycloalkyl group of 5 to 20 carbon atoms;
• an aryl group of 6 to 20 carbon atoms;
• a heterocyclic group of 3 to 20 carbon atoms;
• or a substituent represented by the following Formula 1a:
• in Formula 1a,
• R1f is a single bond, or an alkylene group of 1 to 20 carbon atoms;
• a cycloalkylene group of 5 to 20 carbon atoms;
• or an arylene group of 6 to 20 carbon atoms, each of which is unsubstituted or substituted with an alkyl group of 1 to 10 carbon atoms, a cycloalkyl group of 5 to 10 carbon atoms, or an aryl group of 6 to 20 carbon atoms, and
• R1g and R1h are each independently an alkyl group of 1 to 20 carbon atoms;
• an alkenyl group of 2 to 20 carbon atoms;
• an alkynyl group of 2 to 20 carbon atoms;
• a heteroalkyl group of 1 to 20 carbon atoms;
• a heteroalkenyl group of 2 to 20 carbon atoms;
• a heteroalkynyl group of 2 to 20 carbon atoms;
• a cycloalkyl group of 5 to 20 carbon atoms;
• an aryl group of 6 to 20 carbon atoms;
• or a heterocyclic group of 3 to 20 carbon atoms, or R1g and R1h are connected with each other, and together with N to which they are attached to form a heterocyclic group of 2 to 10 carbon atoms.