Surfactant-Emulating Amphiphilic Polycarbonates and Other Functional Polycarbonates through Metal-Free Copolymerization of CO2 with Ethylene Oxide
KAUST DepartmentChemical Science Program
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Physical Science and Engineering (PSE) Division
KAUST Grant NumberBAS/1/1374-01-01
Online Publication Date2021-07-21
Print Publication Date2021-08-02
Embargo End Date2022-07-21
Permanent link to this recordhttp://hdl.handle.net/10754/670275
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AbstractThree types of ethylene oxide-based and carbonate-containing copolymers were prepared through copolymerization of ethylene oxide (EO) with CO2 under metal-free conditions in the presence of triethylborane (TEB), using onium salts (OS) as initiator. Hydrophobic poly[(ethylene carbonate)x-co-(ethylene oxide)y] (PECEO) samples with carbonate contents above 90% (x ≫ y) were first prepared under a CO2 pressure of 10–30 bar with a ratio of [TEB] to [OS] of 1–1.2 equiv in tetrahydrofuran (THF) or in hexane. The above PECEO (carbonate > 91%) then served as a macroinitiator to grow two external poly(ethylene oxide) (PEO) blocks and generate in one-pot amphiphilic PEO-b-PECEO-b-PEO triblocks. Lastly, the copolymerization of EO under a low pressure of CO2 (1–2 bar) with a ratio of [TEB] to [OS] of 1.2–2.0 equiv afforded hydrophilic poly[(ethylene oxide)y-co-(ethylene carbonate)x] (PEOEC) random copolymers with carbonate contents below 10% (y ≫ x); allyl glycidyl ether (AGE) was also terpolymerized with EO and CO2 under the same conditions to introduce functional groups along the backbone of PEO chains. Critical micelle concentrations (CMC) and size of micelles were measured for amphiphilic PEO-b-PECEO-b-PEO samples and compared with the values of other nonionic surfactants. The properties of “PEO-like” hydrophilic PEOECs were characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and wettability test; their degradation behavior was further investigated under different conditions.
CitationJia, M., Zhang, D., Gnanou, Y., & Feng, X. (2021). Surfactant-Emulating Amphiphilic Polycarbonates and Other Functional Polycarbonates through Metal-Free Copolymerization of CO2 with Ethylene Oxide. ACS Sustainable Chemistry & Engineering. doi:10.1021/acssuschemeng.1c03751
SponsorsThis research work is supported by KAUST under baseline funding (BAS/1/1374-01-01).
PublisherAmerican Chemical Society (ACS)
Except where otherwise noted, this item's license is described as This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Sustainable Chemistry & Engineering, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acssuschemeng.1c03751.