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Crystalline CO2-based polycarbonates prepared from racemic catalyst through intramolecularly interlocked assembly
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Crystalline CO2-based polycarbonates prepared from racemic catalyst through intramolecularly interlocked assembly
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Journal Article
Crystalline CO2-based polycarbonates prepared from racemic catalyst through intramolecularly interlocked assembly
2015
Overview
The crystalline stereocomplexed polycarbonates can be prepared by mixing enantiopure polymers with opposite configuration, which derived from the asymmetric copolymerization with CO
2
using enantiopure catalyst or/and chiral epoxides. Herein, we develop a powerful strategy for producing crystalline intramolecular stereocomplexed polycarbonates from
racemic
catalysts, which possess similar thermal stability and crystalline behaviour in comparison with the stereocomplexes by mixing opposite enantiopure polymers. Living polymer chains shuttle between catalyst molecules with different configurations to produce diastereomeric active species which is suggested to be responsible for the formation of isotactic multiblock polycarbonates in
racemic
bimetallic cobalt catalyst-mediated stereoselective copolymerization of CO
2
and
meso
-epoxides. Solid-state NMR spectroscopy study suggests that the interaction in the carbonyl and methine regions is responsible for the strong crystallization capacity and compact package structure in the crystalline polycarbonates.
Crystalline polycarbonates can be formed by mixing enantiopure polymers with opposite configurations. Here, the authors produce crystalline intramolecular stereocomplexed polycarbonates using a racemic catalyst, and show that these display similar properties to those formed by mixing the two enantiomers.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Pub. Group
