Aldehyde end-capped CO₂-based polycarbonates: a green synthetic platform for site-specific functionalization

Abstract

Aldehyde end-capped CO2-based polycarbonates were prepared to serve as a green platform for the construction of diverse functional polymers.

Phosphine-Borane Frustrated Lewis Pairs for Metal-Free CO2/Epoxide Copolymerization

“…By the Gaussian fitting and integration, the M n of the low-molecular-weight part was 3.2 kDa with a Đ of 1.06, and the M n of the high-molecular-weight part was 4.8 kDa with a Đ of 1.02. Combined with the m/z and relative intensity of MALDI-TOF MS, the peak corresponding to the low molecular weight (3.2 kDa) and less proportion (18%) in GPC was attributed to the double hydroxyl terminated copolymer produced from the chain transfer to water (Scheme S1) while the peak with a high molecular weight (4.8 kDa) and more proportion (82%) was corresponded to the α -P t Bu 3 and ω -OH terminated copolymer. A similar copolymer structure was also obtained when the copolymerization was initiated by PCy 3 , PPh 3 , and P n Pr 3 (Figures S28–30).…”

From plastic to elastomers: introducing reversible copper–thioether coordination in CO2-based polycarbonate

“…Wang and coworkers reported an aldehyde end-capped PPC via telomerization using 4-formylbenzoic acids as a starter, allowing for improvements in hydrophilicity, thermal stability, and fluorescence properties after post-functionalization. 28 However, owing to the low glass transition temperature (T g < 40 °C), PPC cannot be utilized as an engineering material on its own. [29][30][31] In contrast, poly(cyclohexene carbonate) (PCHC) derived from the copolymerization of CO 2 /CHO shows a high T g of above 110 °C with good mechanical strength, but suffers from high brittleness.…”

Calculation of Greenhouse Gas Savings: Switch from Electricity Production to Biomethane. Case Study

“…Two main ways of using carbon dioxide can be distinguished -its conversion into various products (for example, plastic [9], [10], and its use directly without modification [3]. Unlike using carbon dioxide directly, converting it is a more attractive option, as it allows getting valuable products, such as new chemical compounds (like carbon monoxide), as well as fuel Environmental and Climate Technologies ____________________________________________________________________________ 2023 / 27 837 [11], [12].…”