Carbon dioxide is {inexpensive|affordable|low-cost|economical|cheap} and abundant, and its prevalence as waste {makes|tends to make} it {attractive|appealing|desirable|eye-catching} as a sustainable chemical feedstock. {Although|Even though|Though|Despite the fact that|While} {there are|you will find|you’ll find|you can find|you will discover|there are actually} examples of copolymerizations of CO2 with high-energy monomers, the direct copolymerization of CO2 with olefins has not been reported. Herein, an alternate route to tunable, recyclable polyesters derived from CO2 and butadiene {via|by way of|through|by means of} an intermediary lactone, 3-ethyl-6-vinyltetrahydro-2H-pyran-2-one, is described. Catalytic ring-opening polymerization {of the|from the|in the|on the|with the|of your} lactone by 1,{5|five},7-triazabicyclo[4.{4|four}.0]dec-5-ene yields polyesters with molar masses {up to|as much as} 13.{6|six} kg/mol and pendent vinyl sidechains {that can|that may|that will|that could|which will|which can} undergo post-polymerization functionalization. The polymer {has a|features a|includes a} low ceiling temperature of 138 ºC, {allowing|permitting|enabling} for facile chemical recycling. These {results|outcomes|final results|benefits} mark {the first|the very first|the initial} {example|instance} of a well-defined polyester derived solely from CO2 and olefins, expanding access to new feedstocks that {were|had been|have been} {once|as soon as|when|after} {considered|regarded as|deemed|regarded|viewed as|thought of} unfeasible. 23978-55-4 custom synthesis 870991-70-1 In stock PMID:32472497
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