Herein we report the use of a tetrazine-norbornene inverse electron demand Diels–Alder
conjugation applied to polymer end-functionalization and polymer–polymer coupling. The
reaction was found to be applicable to polymer–polymer coupling, as judged by SEC, DOSY
NMR, and LCxSEC analyses, giving diblock copolymers by merely mixing the constituent
homopolymers together under ambient conditions, using no catalyst, additive, or external
stimulus.

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