Supercritical Carbon Dioxide as an Environmentally Benign Reaction Medium for Chemical Synthesis

ChemInform ◽  
2003 ◽  
Vol 34 (29) ◽  
Author(s):  
Nathalie Tanchoux ◽  
Walter Leitner
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Chemical Synthesis ◽  
Reaction Medium ◽  
Environmentally Benign ◽  
Supercritical Carbon

scholarly journals The Effect of Polymerization Temperature on the Properties of Polyvinyl Fluoride Polymerization in Supercritical Carbon Dioxide

2021 ◽  
Vol 2101 (1) ◽  
pp. 012063
Author(s):  
Wei Liu ◽  
Yanzhong Zhang ◽  
Huaiyun Chang ◽  
Rong Cai ◽  
Peiliang Ma
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Reaction Medium ◽  
Chemical Processes ◽  
Light Transmittance ◽  
Polymerization Temperature ◽  
Irregular Structure ◽  
Lower Melting Point ◽  
Application Fields ◽  
Supercritical Carbon

Abstract The ongoing search for environmentally friendlier alternative to the organic solvents used in chemical processes has led to the development of technologies based on supercritical carbon dioxide (scCO2), which is non-flammable, non-toxic and relatively inert fluid. Polymer chemistry does not escape this trend. Fluoropolymers prepared in scCO2 have many special properties, which are different from fluoropolymers that use water as the reaction medium, this paper studies the effect of polymerization temperature on polyvinyl fluoride polymerization in supercritical carbon dioxide. The results show that as the polymerization temperature increases, the intrinsic viscosity and shear viscosity of the polymer gradually decreases; at the same time, the increasing of polymerization temperature leads to higher proportion of irregular structure of the polymer, which causes lower melting point and lower crystallinity, and the film prepared by the resin also exhibits a higher visible light transmittance. The above results show that the resin polymerized in supercritical carbon dioxide can impart better performance to conventional polymerization, which expands the potential application fields of the resin.

Study on the Graft Copolymerization of AN onto PP by Using Supercritical Carbon Dioxide

2013 ◽  
Vol 815 ◽  
pp. 717-721 ◽  
Author(s):  
Ya Zhen Wang ◽  
Di Ma ◽  
Cheng E Yue ◽  
Wei Nan Jia ◽  
Yong Li
Keyword(s):  
Carbon Dioxide ◽  
Reaction Time ◽  
Solid State ◽  
Supercritical Carbon Dioxide ◽  
Graft Copolymerization ◽  
Environmentally Benign ◽  
Graft Polymer ◽  
Swelling Agent ◽  
Grafting Reaction ◽  
Supercritical Carbon

The research reported in this paper aimed at exploring the advantages of using supercritical carbon dioxide (scCO2) as an environmentally benign solvent and swelling agent for carrying out the grafting process of acrylonitrile (AN) onto polypropylene (PP) in the solid state by using benzoyl peroxide (BPO) as initiator in the reaction. In order to get a well graft ratio, the effects of various factors in this grafting reaction are investigated. Those factors included the reaction time, reaction temperature, monomer and initiator concentrations and the CO2 pressure. IR was used to characterize the constituent of the graft polymer. Then anti-aging of the PP-g-AN was studied by UV-vis. Results showed that the scCO2-assisted solid-state grafting process of AN onto PP did have some scientifically interesting and industrially relevant advantages over the melt process. Compare with virgin PP, the graft polymer have a better performance in anti-aging.

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