Structure–Performance Relationships in Newly Designed Linear Polyamines for Advanced CO2 Sorption
Year: 2026
Type: preprint
Abstract: Establishing structure–performance relationships is key to designing next‑generation CO2 sorbents with high efficiency and durability. This study investigates two newly designed linear polyamines, poly(hexyleneimine) (PHI) and poly(undecyleneimine) (PUI), obtained from polyamide feedstocks and developed as innovative polymer‑based materials for advanced CO2 capture. Their sorption capacity, desorption kinetics and thermal stability were evaluated in unsupported and fumed‑silica‑supported forms to elucidate how backbone architecture and amine spacing govern performance. Thermogravimetric analysis revealed that unsupported PHI and PUI effectively sorb and desorb CO2 at 110°C and 50°C, respectively. Cryo-milling selectively enhanced PUI performance, highlighting the critical influence of molecular architecture on amine site accessibility. Support impregnation significantly improved low-temperature performance: supported PHI achieved a maximum uptake of 1.67 mmol·g-1 at 70°C with an amine efficiency of 0.34, comparable to commercial linear poly(ethyleneimine) (L-PEI), while supported-PUI reached 0.85 mmol·g-1 at 50°C. Both polyamines demonstrated superior resistance to oxidative degradation compared to L-PEI, attributed to their higher density of amine spacers. Overall, PHI and PUI demonstrate how molecular design directly translates/impacts CO2 sorption performance, positioning these linear polyamines as robust, thermally reversible sorbents for advanced carbon‑capture applications.
Source: ChemRxiv
Language: English
Subfield: Filtration and Separation
Field: Chemical Engineering
Domain: Physical Sciences
SDG: Climate action
Open Access status: green
OpenAlex ID: W7204953145