Pick your polymer: The reactivity ratios, r, of the comonomers can be controlled by the configuration of the active species in the copolymerization of ε-caprolactone (CL) and l,l-lactide (LA; see scheme). Thus, by varying the configuration of the initiator, a broad spectrum of copolymers with different microstructures, from gradient to more random, can be prepared in a controlled way.
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