Bifunctionalized polymer

A bifunctionalized elastomer comprising the reaction product of 1) a living anionic elastomeric polymer initiated with a functional initiator and 2) a functional polymerization terminator, wherein

• 1) the living anionic elastomeric polymer initiated with a functional initiator is of formula AYLi where Y is a divalent polymer radical, Li is a lithium atom bonded to a carbon atom of Y, and A is an amine-containing radical having the formula X
• wherein R15 and R16 independently have from 1 to 20 carbon atoms and each are independently an alkyl group, a cycloalkyl group, an aromatic group, a substituted alkyl group, a substituted cycloalkyl group or a substituted aromatic group, or R15 and R16 taken together with the nitrogen to which both R15 and R16 are attached comprise a heterocyclic amine group wherein R15 and R16 taken together form an alkanediyl group of from 4 to 20 carbon atoms or a substituted alkanediyl group of from 4 to 20 carbon atoms, and R17 is a covalent bond, an alkanediyl group of from 1 to 20 carbon atoms or a substituted alkanediyl group of from 1 to 20 carbon atoms;
• and
• 2) the functional polymerization terminator is of formula I
• wherein R1 is C1 to C4 linear alkyl, or C1 to C4 branched alkanediyl;
• X1, X2, X3 are independently O, S, or a group of formula (II) or (III)
• where R2 is C1 to C18 linear or branched alkyl;
• Z is R3, —OR4, or —R5—X4;
• R3, R4 are independently C1 to C18 linear or branched alkyl;
• R5 is C1 to C18 alkanediyl or dialkyl ether diyl;
• X4 is halogen or a group of structure IV, V, VI, VII or VIII
• wherein R6, R7, R8, R9, and R10 are independently H or C1 to C8 alkyl;
• R11 is C2 to C8 alkanediyl;
• R12 and R13 are independently H, aryl or C1 to C8 alkyl;
• Q is N or a group of structure IX
• wherein R14 is C1 to C8 alkyl.