Modification polymerization initiator and method for preparing the same

A modification polymerization initiator, comprising at least one derived unit from a compound represented by the following Formula 1 and a derived unit from a compound represented by the following Formula 2:

• in Formula 1,
• A is —NRaRb, —ORc, or —SRd, and
• Ra to Rd are each independently an alkyl group of 1 to 30 carbon atoms, an alkenyl group of 2 to 30 carbon atoms, an alkynyl group of 2 to 30 carbon atoms, a cycloalkyl group of 3 to 30 carbon atoms, an aryl group of 6 to 30 carbon atoms, a heteroalkenyl group of 2 to 30 carbon atoms, a heteroalkynyl group of 2 to 30 carbon atoms, a heterocycloalkyl group of 2 to 30 carbon atoms or a heteroaryl group of 3 to 30 carbon atoms, where each of Ra to Rd is unsubstituted or substituted with a substituent comprising one or more heteroatoms selected among N, O, S, Si and F atoms, and Ra and Rb are optionally combined with each other to form an aliphatic hydrocarbon ring of 5 to 20 carbon atoms, an aromatic hydrocarbon ring of 5 to 20 carbon atoms, or a heterocycle of 3 to 20 carbon atoms, which is unsubstituted or substituted with an alkyl group of 1 to 30 carbon atoms,
• M+—Re− [Formula 2]
• in Formula 2,
• M is an alkali metal, and
• Re is hydrogen, an alkyl group of 1 to 30 carbon atoms, an alkenyl group of 2 to 30 carbon atoms, an alkynyl group of 2 to 30 carbon atoms, a cycloalkyl group of 5 to 30 carbon atoms, or an aryl group of 6 to 30 carbon atoms.