Temperature triggered alternating copolymerization of epoxides and lactones via pre-sequenced spiroorthoester
Hyuk-Joon Jung1, Chatura Goonesinghe1, Parisa Mehrkhodavandi1
1Department of Chemistry, University of British Columbia 2036 Main Mall Vancouver BC V6T 1Z1 Canada mehr@chem.ubc.ca.
Abstract:
We report the alternating copolymerization of caprolactone and epoxide through the in situ formation of pre-sequenced spiroorthoester monomer. The reaction is catalyzed by the temperature triggered, bifunctional cationic indium complex (±)-[(NNiOtBu)In(CH2SiMe3)][B(C6F5)4] (1). 1 can catalyze the coupling of epoxide and lactone to form spiroorthoester at 60 °C and its double ring-opening polymerization at 110 °C to form poly(ether-alt-ester). The post-polymerization modification and degradation of the poly(ether-alt-ester) are further investigated.
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