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Nanomaterials
Poly(1-decene)
Effective Viscosification of Supercritical Carbon Dioxide by Low Molecular Weight Poly(1-decene)
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Kar T, Firoozabadi A. et al. IScience, 2022, 25(5).
Viscosification of carbon dioxide by polymers could make large-scale carbon dioxide storage safe and effective. Poly-1-decene (P1D) with approximately 20 repeating units effectively promotes CO2 viscosification, with a 6.5-fold increase in viscosity enhancement at a concentration of 1.8 wt% at 308 K and 31 MPa. For most CO2 sequestration conditions, a five-to-six-fold increase in CO2 viscosity will allow significant sweep improvement and make CO2 storage safe.
How does poly-1-decene achieve CO2 viscosification?
· It is inferred that methyl groups and branching promote dissolution and viscosity. Low molecular weight oligomers can have lower solubility in CO2 than higher molecular weight ones.
· At supercritical pressure conditions of 17 MPa and 24 MPa, the solubility in CO2 is not monotonic.
· At 31 MPa, also a supercritical condition, there is a slow reduction in CO2 solubility with molecular weight followed by a sharp drop.
· For the same concentration, there is increase in viscosity from increase in molecular size. The trend is exponential.
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