Circle the wagons: Well-defined cyclic poly(4-vinylbenzylcarbazole) (cyclic PVBCZ) polymers with differing molecular weights were prepared efficiently by successive atom-transfer radical polymerization (ATRP) and a click reaction (see picture; Σ=azide, Δ=alkynyl groups). The cyclic PVBCZ displayed a higher glass transition temperature than its linear precursor and has a higher fluorescence emission.
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Zhu et al. (2011) studied this question.
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