End-capped poly(ester amide) copolymers

A polymer of formula:

• PEA-Inactivated Terminal Amino Group
• or
• Inactivated Terminal Carboxyl Group-PEA;
• wherein PEA comprises formula I:
• wherein:
• m is an integer;
• n is 0 or an integer;
• X, Y, Z1 and Z2 are each independently branched or straight chain alkylene, cycloalkylene, alkenylene, alkynylene, arylene, heteroarylene, or heterocycloalkylene;
• Inactivated Terminal Carboxyl Group is:
• —C(O)NR1R2, wherein R1 and R2 are H, 2 to 12 carbon alkyl, alkyl ether, or alkyl hydroxyl;
• or —C(O)SR, wherein R is 2 to 12 carbon alkyl;
• and
• Inactivated Terminal Amino Group is:
• —NR3+X−, wherein X is Br, Cl, or I, and each R is a primary or secondary alkyl radical having 2 to 12 carbon atoms;
• —NHC(O)R, wherein R is a primary or secondary alkyl radical having 2 to 12 carbon atoms;
• —NHR, wherein R is a primary or secondary alkyl radical having 2 to 12 carbon atoms;
• —N(C(R)3)2, wherein each R is hydrogen or a primary or secondary alkyl radical having 2 to 12 carbon atoms;
• —CH═CH2;
• —NO2;
• —NHC(O)R, wherein R is cycloalkyl, aryl, or a saturated, linear or branched alkyl;
• —NHCH2CH(OH)R, wherein R is cycloalkyl, aryl, or a saturated, linear or branched alkyl;
• —NHC(O)NHR, wherein R is cycloalkyl, aryl, or a saturated, linear or branched alkyl;
• —NHC(S)NHR, wherein R is cycloalkyl, aryl, or a saturated, linear or branched alkyl;
• or —NHCH2CH2C(O)R, wherein R is hydrogen, a primary or secondary alkyl radical having 2 to 12 carbon atoms, or OR′, wherein R′ is a primary or secondary alkyl radical having 2 to 12 carbon atoms.