主权项 |
1. A polymer comprising non-degradable blocks and degradable blocks, wherein said polymer has the structure of Formula (Ia): wherein t, p, q and r are positive integers, m is l, and n is zero; and R, R1, R2, R3, R4 and R″ are independently selected in each structural unit from the group consisting of H, substituted alkyl, unsubstituted alkyl, substituted heteroalkyl, unsubstituted heteroalkyl, substituted cycloalkyl, unsubstituted cycloalkyl, substituted heterocycloalkyl, unsubstituted heterocycloalkyl, substituted aryl, unsubstituted aryl, substituted heteroaryl, unsubstituted heteroaryl, substituted alkoxy, unsubstituted alkoxy, ester, nitro, amine, amide, and thiol. |