Influence of operating temperature on CO2-NH3 reaction in an aqueous solution

Choi, Bong Gill; Kim, Gyo Hee; Yi, Kwangkeun; Kim, Jong‐Nam; Hong, Won Hi

doi:10.1007/s11814-011-0203-5

Cited by 9 publications

(1 citation statement)

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“…FT-IR spectroscopic analysis of the species obtained from the 1:1 molar ratio reaction of DBU and Bu-NCA further confirms the formation of zwitterionic species in the initiation event (Figure S9). The peak at 1572 cm –1 is due to the carbonyl stretch of the carbamate group at the chain end, ,, which is consistent with the molecular ions observed by the ESI-MS analysis of the reaction mixture. The peak at 1684 cm –1 is due to the amide carbonyl group of the PNBG backbone.…”

Section: Resultssupporting

confidence: 84%

Amidine-Mediated Zwitterionic Ring-Opening Polymerization of N-Alkyl N-Carboxyanhydride: Mechanism, Kinetics, and Architecture Elucidation

et al. 2016

Macromolecules

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Zwitterionic ring-opening polymerization (ZROP) of Nbutyl N-carboxyanhydrides (Bu-NCAs) has been investigated using 1,8diazabicycloundec-7-ene (DBU), a bicyclic amidine initiator. It was found that poly(N-butylglycine)s (PNBGs) with molecular weight (M n ) in the 3.5−32.4 kg mol −1 range and polydispersity index (PDI) in the 1.02−1.12 range can be readily obtained by systematically varying the initial monomer to initiator feed ratio. The polymerization exhibits characteristics of a controlled polymerization, as evidenced by the linear increase of polymer molecular weight with conversion and the successful enchainment experiments. Kinetic studies revealed that the reaction is first-order dependent on the monomer and the DBU concentration. The rate of initiation is comparable to that of the propagation. Random copolypeptoids of poly[(N-propargylglycine)-r-(N-butylglycine)]s [P-(NPgG-r-NBG)s] were also synthesized by DBU-mediated copolymerization of Bu-NCA and N-propargyl N-carboxyanhydride (Pg-NCA). Subsequent grafting with azido-terminated poly(ethylene glycol) (PEG) produces bottlebrush copolymers. Analysis of bottlebrush copolymer samples using atomic force microscopy (AFM) revealed a surface morphology of toroid-shaped nanostructures, consistent with the polypeptoid backbone having cyclic architecture. Small-angle neutron scattering (SANS) characterization of the bottlebrush polymer ensemble in solution also confirms the cyclic architecture of the polypeptoid backbones.

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Section: Resultssupporting

confidence: 84%