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Beckman, Ericka

doi:10.5749/minnesota/9780816679195.003.0006

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“…Indeed, a large body of work has shown that scCO 2 presents very distinct advantages as a solvent for the synthesis of a wide range of polymers . Earlier work has shown that aliphatic polycarbonates can be prepared by precipitation polymerization and that copolymerization to form polycarbonates is viable in scCO 2 . However, the copolymerization of CO 2 and epoxide in scCO 2 has not been much studied.…”

Section: Introductionmentioning

confidence: 99%

Effect of supercritical CO₂ on the copolymerization behavior of cyclohexene oxide/CO₂ and copolymer properties with DMC/Salen‐Co(III) catalyst system

Meng

Pepper

Cheng

et al. 2016

J. Polym. Sci. Part A: Polym. Chem.

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. The copolymerization of cyclohexene oxide (CHO) and carbon dioxide (CO 2 ) was carried out under supercritical CO 2 (scCO 2 ) conditions to afford poly (cyclohexene carbonate) (PCHC) in high yield. The scCO 2 provided not only the C1 feedstock but also proved to be a very efficient solvent and processing aid for this copolymerization system. Double metal cyanide (DMC) and salen-Co(III) catalysts were employed, demonstrating excellent CO 2 /CHO copolymerization with high yield and high selectivity. Surprisingly, our use of scCO 2 was found to significantly enhance the copolymerization efficiency and the quality of the final polymer product. Thermally stable and high molecular weight (MW) copolymers were successfully obtained. Optimization led to excellent catalyst yield (656 wt/ wt, polymer/catalyst) and selectivity (over 96% toward polycarbonate) that were significantly beyond what could be achieved in conventional solvents. Moreover, detailed thermal analyses demonstrated that the PCHC copolymer produced in scCO 2 exhibited higher glass transition temperatures (T g 114 8C) compared to polymer formed in dense phase CO 2 (T g 77 8C), and hence good thermal stability. Additionally, residual catalyst could be removed from the final polymer using scCO 2 , pointing toward a green method that avoids the use of conventional volatile organic-based solvents for both synthesis and work-up.

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Section: Introductionmentioning

confidence: 99%

Effect of supercritical CO₂ on the copolymerization behavior of cyclohexene oxide/CO₂ and copolymer properties with DMC/Salen‐Co(III) catalyst system

Meng

Pepper

Cheng

et al. 2016

J. Polym. Sci. Part A: Polym. Chem.

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Effect of supercritical CO₂ on the copolymerization behavior of cyclohexene oxide/CO₂ and copolymer properties with DMC/Salen‐Co(III) catalyst system

Effect of supercritical CO₂ on the copolymerization behavior of cyclohexene oxide/CO₂ and copolymer properties with DMC/Salen‐Co(III) catalyst system

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Cited by 1 publication

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Effect of supercritical CO2 on the copolymerization behavior of cyclohexene oxide/CO2 and copolymer properties with DMC/Salen‐Co(III) catalyst system

Effect of supercritical CO2 on the copolymerization behavior of cyclohexene oxide/CO2 and copolymer properties with DMC/Salen‐Co(III) catalyst system

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Effect of supercritical CO₂ on the copolymerization behavior of cyclohexene oxide/CO₂ and copolymer properties with DMC/Salen‐Co(III) catalyst system

Effect of supercritical CO₂ on the copolymerization behavior of cyclohexene oxide/CO₂ and copolymer properties with DMC/Salen‐Co(III) catalyst system