Branched multi-functional macromonomers and related polymers and uses thereof

A macromonomer of Formula (II):

• or a salt thereof, wherein:
• each instance of RA is independently hydrogen, halogen, or substituted or unsubstituted, C1-6 alkyl;
• a is an integer from 1 to 20, inclusive;
• each instance of M′ is independently an agent;
• each instance of m′ is independently an integer from 2 to 10, inclusive;
• each instance of L is independently substituted or unsubstituted, C1-200 alkylene, substituted or unsubstituted, C2-200 alkenylene, substituted or unsubstituted, C2-200 alkynylene, substituted or unsubstituted, C2-200 heteroalkylene, substituted or unsubstituted, C2-200 heteroalkenylene, or substituted or unsubstituted, C2-200 heteroalkynylene, wherein:
• optionally one or more carbons in each instance of the substituted or unsubstituted, C1-200 alkylene, substituted or unsubstituted, C2-200 alkenylene, substituted or unsubstituted, C2-200 alkynylene, substituted or unsubstituted, C2-200 heteroalkylene, substituted or unsubstituted, C2-200 heteroalkenylene, and substituted or unsubstituted, C2-200 heteroalkynylene are independently replaced with substituted or unsubstituted carbocyclylene, substituted or unsubstituted heterocyclylene, substituted or unsubstituted arylene, or substituted or unsubstituted heteroarylene;
• optionally one or more heteroatoms in each instance of the substituted or unsubstituted, C2-200 heteroalkylene, substituted or unsubstituted, C2-200 heteroalkenylene, and substituted or unsubstituted, C2-200 heteroalkynylene are independently replaced with substituted or unsubstituted carbocyclylene, substituted or unsubstituted heterocyclylene, substituted or unsubstituted arylene, or substituted or unsubstituted heteroarylene;
• each instance of RB is independently hydrogen, halogen, or substituted or unsubstituted, C1-6 alkyl;
• each instance of b is independently an integer from 1 to 20, inclusive;
• e is an integer from 1 to 10, inclusive;
• X is —ORC or —N(RD)2, wherein:
• RC is hydrogen, substituted or unsubstituted, C1-1000 alkyl, substituted or unsubstituted, C2-1000 alkenyl, substituted or unsubstituted, C2-1000 alkynyl, substituted or unsubstituted, C1-1000 heteroalkyl, substituted or unsubstituted, C2-1000 heteroalkenyl, substituted or unsubstituted, C2-1000 heteroalkynyl, an oxygen protecting group, or a leaving group;
• each instance of RD is independently hydrogen, substituted or unsubstituted, C1-1000 alkyl, substituted or unsubstituted, C2-1000 alkenyl, substituted or unsubstituted, C2-1000 alkynyl, substituted or unsubstituted, C1-1000 heteroalkyl, substituted or unsubstituted, C2-1000 heteroalkenyl, substituted or unsubstituted, C2-1000 heteroalkynyl, or a nitrogen protecting group, or two RD are taken together to form a substituted or unsubstituted heterocyclyl or substituted or unsubstituted heteroaryl moiety;
• and
• each instance of R1 is independently hydrogen, halogen, or substituted or unsubstituted, C1-6 alkyl, or two R1 bonded to the same carbon are taken together to form an oxo group.