Preparation of polyvinyl alcohol–chitosan– NH 4 Br catalyst and its application to cycloaddition of carbon dioxide to propylene oxide

2021 ◽  
Author(s):  
Hak‐Min Kim ◽  
Kyeongseok Oh ◽  
Daeseung Kyung ◽  
Han‐geun Ahn ◽  
Inhwan Yoon ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Polyvinyl Alcohol ◽  
Propylene Oxide

Chiral salenCo(iii) complexes with bulky substituents as catalysts for stereoselective alternating copolymerization of racemic propylene oxide with carbon dioxide and succinic anhydride

2021 ◽  
Vol 12 (12) ◽  
pp. 1776-1786
Author(s):  
Zhou Wang ◽  
Ying Mu
Keyword(s):  
Carbon Dioxide ◽  
Propylene Carbonate ◽  
Propylene Oxide ◽  
Succinic Anhydride ◽  
Poly Propylene ◽  
Alternating Copolymerization

Stereoregular poly(propylene carbonate)s and poly(propylene succinate-block-carbonate)s were synthesized with new chiral salenCo(iii) catalysts carrying bulky substituents.

scholarly journals Electrospun polyvinyl alcohol/carbon dioxide modified polyethyleneimine composite nanofiber scaffolds

2014 ◽  
Vol 29 (10) ◽  
pp. 1407-1417 ◽  
Author(s):  
Han-Bing Wu ◽  
David H Bremner ◽  
Hua-Li Nie ◽  
Jing Quan ◽  
Li-Min Zhu
Keyword(s):  
Carbon Dioxide ◽  
Polyvinyl Alcohol ◽  
Composite Nanofiber ◽  
Nanofiber Scaffolds

scholarly journals Tertiary Amines Paired with Trialkyl Boranes: A Simple Organocatalyst for Fully Alternating Copolymerization of Carbon Dioxide and Propylene Oxide

2020 ◽  
Author(s):  
Xing-Hong Zhang
Keyword(s):  
Carbon Dioxide ◽  
Small Molecules ◽  
Propylene Oxide ◽  
Average Molecular Weight ◽  
Tertiary Amines ◽  
Carbon Dioxide Co2 ◽  
Poly Propylene ◽  
Alternating Copolymerization ◽  
Completely Alternating ◽  
Huge Challenge

Metal-free synthesis of fully alternating polycarbonates from carbon dioxide (CO2) and epoxides is highly desired but a huge challenge. Here, we disclose the combination of tertiary amines with trialkyl boranes for completely alternating copolymerization of CO2 with epoxides. Triethylamine (TEA) pairing with triethyl borane (TEB), the simplest catalyst for the copolymerization of CO2 and propylene oxide (PO), afforded fully alternating poly(propylene carbonate) (PPC) with a turnover frequency (TOF) of 54 h-1 at 60 oC. Remarkably, diamine such as, N,N,N',N'-tetraethylethylenediamine (TEED) and triamine such as N,N,N',N'',N''-pentamethyldiethylene triamine (PMDETA) pairing with TEB exhibited improved the copolymer selectivity of up to 99%. Supplementally, the effect of trialkylborane structure on the copolymerization were also investigated. Moreover, PPCs prepared from these tertiary amines/ trialkyl boranes Lewis pairs showed the head-to-tail diad content of around 80%. The number-average molecular weight of PPC was up to 56.0 kg/mol with narrow distribution (Đ =1.16) and could be easily adjusted by simply varying the feeding ratios. The 1H NMR spectra and MALDI-TOF-MS spectra suggest that both tertiary amine-activating CO2 and TEB-masked end anions cooperatively promote the fully alternating CO2/epoxide copolymerization. This work provides an organocatalytic platform for well-defined CO2/epoxide copolymers using simple small molecules with high atomic utilization.<br>

Kinetics of Ternary Copolymerization of Carbon Dioxide with Propylene Oxide, Butene Oxide, and Cyclohexene Oxide

2019 ◽  
Vol 61 (4) ◽  
pp. 395-403 ◽  
Author(s):  
O. M. Chukanova ◽  
K. O. Korenkov ◽  
E. O. Perepelitsina ◽  
N. O. Garifullin ◽  
I. V. Sedov
Keyword(s):  
Carbon Dioxide ◽  
Propylene Oxide ◽  
Cyclohexene Oxide ◽  
Kinetics Of

scholarly journals Fibroin and Polyvinyl Alcohol Hydrogel Wound Dressing Containing Silk Sericin Prepared Using High-Pressure Carbon Dioxide

2019 ◽  
Vol 8 (9) ◽  
pp. 452-462 ◽  
Author(s):  
Supamas Napavichayanun ◽  
Walter Bonani ◽  
Yuejiao Yang ◽  
Antonella Motta ◽  
Pornanong Aramwit
Keyword(s):  
Carbon Dioxide ◽  
High Pressure ◽  
Polyvinyl Alcohol ◽  
Wound Dressing ◽  
Silk Sericin

Protic pyrazolium ionic liquids for efficient chemical fixation of CO2: design, synthesis, and catalysis

2018 ◽  
Vol 3 (2) ◽  
pp. 348-356 ◽  
Author(s):  
Danning Zheng ◽  
Tengfei Wang ◽  
Xinrui Zhu ◽  
Ci Chen ◽  
Tiegang Ren ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Catalytic Activity ◽  
Ionic Liquids ◽  
Propylene Oxide ◽  
Coupling Reaction ◽  
Chemical Fixation ◽  
Design Synthesis

Three new protic pyrazolium ILs, HTMPzBr, HMM3PzBr, and HMM5PzBr, have been synthesized to explore their catalytic activity for the coupling reaction of carbon dioxide and propylene oxide.

Synthesis, structures, and thermal properties of terpolymers of propylene oxide, carbon dioxide, and cyclohexene oxide

2019 ◽  
Vol 68 (11) ◽  
pp. 2119-2125
Author(s):  
Z. N. Nysenko ◽  
E. E. Said-Galiev ◽  
M. I. Buzin ◽  
G. G. Nikiforova ◽  
M. M. Il’in ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Thermal Properties ◽  
Propylene Oxide ◽  
Cyclohexene Oxide

Niobium(v) chloride and imidazolium bromides as efficient dual catalyst systems for the cycloaddition of carbon dioxide and propylene oxide

2014 ◽  
Vol 4 (6) ◽  
pp. 1638-1643 ◽  
Author(s):  
Michael E. Wilhelm ◽  
Michael H. Anthofer ◽  
Robert M. Reich ◽  
Valerio D'Elia ◽  
Jean-Marie Basset ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Catalytic Activity ◽  
Propylene Oxide ◽  
Catalyst System ◽  
Cyclic Carbonates ◽  
Imidazolium Salt ◽  
Catalyst Systems

Imidazolium bromides combined with niobium(v) choride were used as catalyst system for the reaction of CO2 with epoxides to cyclic carbonates. The variation of the cation structure strongly affects the properties of the imidazolium salt and therefore the catalytic activity.

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