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Semi-fluorinated trialkyltin fluorides and fluorinated telechelic ionomers as viscosity-enhancing agents for carbon dioxide

Shi, C and Huang, Z and Beckman, EJ and Enick, RM and Kim, SY and Curran, DP (2001) Semi-fluorinated trialkyltin fluorides and fluorinated telechelic ionomers as viscosity-enhancing agents for carbon dioxide. Industrial and Engineering Chemistry Research, 40 (3). 908 - 913. ISSN 0888-5885

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Abstract

Direct thickeners for dense carbon dioxide were designed and synthesized. Each thickener contained "CO2-philic" fluorinated groups to impart solubility in carbon dioxide and "CO2-phobic" functionalities to promote intermolecular associations for viscosity enhancement. Semifluorinated trialkyltin fluorides and fluorinated telechelic ionomers were soluble to at least several weight percent in dense liquid carbon dioxide without the use of a cosolvent. Increases in solution viscosity at 297 K were measured using falling cylinder viscometry. The viscosity of liquid carbon dioxide was increased by a factor of 2-3 at thickener concentrations of 2-4 wt %. These results demonstrate that carbon dioxide viscosity enhancement is possible without the need for a cosolvent through the design of compounds with the appropriate balance of CO2-philic groups for solubility and CO2-phobic associating groups for macromolecular, viscosity-enhancing interactions. Neither compound, however, was as effective as the (29% styrene-71% fluoroacrylate) copolymer we recently developed. More substantial increases in solution viscosity were not attained with the semi-fluorinated trialkyltin fluoride because the fluorinated alkyl chains disrupted the associations that formed viscosity-enhancing, weakly associating, linear polymers. The viscosity increases obtained with the telechelic ionomer were also less than expected because of the relatively low molecular weight of the carbon-dioxide-soluble ionomers. Higher-molecularweight ionomers would not be CO2-soluble, however.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Shi, C
Huang, Z
Beckman, EJbeckman@pitt.eduBECKMAN0000-0002-9958-3589
Enick, RMrme@pitt.eduRME
Kim, SY
Curran, DPcurran@pitt.eduCURRAN
Date: 1 January 2001
Date Type: Publication
Journal or Publication Title: Industrial and Engineering Chemistry Research
Volume: 40
Number: 3
Page Range: 908 - 913
DOI or Unique Handle: 10.1021/ie0001321
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Refereed: Yes
ISSN: 0888-5885
Date Deposited: 14 Feb 2014 16:47
Last Modified: 05 Feb 2019 03:55
URI: http://d-scholarship.pitt.edu/id/eprint/20557

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