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Synthesis of Fluorinated Homopolymers by ATRP and the Determination of Their Extent Solubility in CO 2 by Light Scattering

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Synthesis of Fluorinated Homopolymers by ATRP and the Determination of Their Extent Solubility in CO2 by Light Scatterin - PowerPoint PPT Presentation


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Synthesis of Fluorinated Homopolymers by ATRP and the Determination of Their Extent Solubility in CO 2 by Light Scattering. Tiffani Nicole Bailey i sarah l. folk ii , joseph m. desimone ii,iii. I. Hampton University School of Science Hampton, VA 23668

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Synthesis of Fluorinated Homopolymers by ATRP andthe Determination of Their Extent Solubility in CO2 by Light Scattering

Tiffani Nicole Baileyi

sarah l. folkii, joseph m. desimoneii,iii

I.Hampton University

School of Science

Hampton, VA 23668

II.University of North Carolina at Chapel Hill

Dept of Chemistry, Venable Hall CB 3290

Chapel Hill, NC 27599

III. North Carolina State University

Dept of Chemical Engineering

Raleigh, NC 27695

NSF Science and Technology Center for Environmentally

Responsible Solvents and Processes

objective
Objective
  • To determine the relative solubilities of
  • a collection of fluorinated Methacrylates
  • and Acrylates in CO2 as a function of
  • molecular weight and structure.
atom transfer radical polymerization
Atom Transfer Radical Polymerization

A CLASSICAL ATRP REACTION SCHEME

pmma gpc results
PMMA – GPC results

OO

Mn, targeted = 22,000g/mol

GPC of PMMA synthesized in

toluene (33 v/v% monomer)

Eluent = THF

pfoma monitoring of conversion
PFOMA – Monitoring of Conversion

monomer

monomer

polymer

polymer

polymer

monomer

7 6 5 4 3 2 1 0

7 6 5 4 3 2 1 0

7 6 5 4 3 2 1 0

4hr 5min 74.2%

1hr 15min 12.8%

22hr 30min 93.3%

cloud point curve of pfoma
Cloud Point Curve of PFOMA

one phase

two phase

1.2 w/w% in CO2

light scattering
Light Scattering
  • Conventional solvents
    • isorefractive
    • too little contrast
  • In CO2 we can determine
    • Molecular Weight
    • Size
    • A2 (second virial coefficient)

Comparison of fluorinated

homopolymer solubilities by A2

future works
Future Works

25% Branching of Fluorinated Chains

25% Branching of Fluorinated Chains

Perfectly Linear

Perfectly Linear

acknowledgments
Acknowledgments
  • North Carolina at Chapel Hill SPGRE Program/
    • National Science Foundation
  • Dr. Mireille Adam, Dr. Darlene Taylor,
  • Dr. Jason Keiper, and Karen Erford
  • This material is based upon work supported in part
    • by the STC Program of the National Science
    • Foundation under Agreement No. CHE-9876674.
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