Abstract/Details

Interaction of ionic liquid-dissolved polymers


2010 2010

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Abstract (summary)

Ionic liquids (ILs), neoteric salts with Tm < 100°C, have garnered vast interest due to a number of unique properties including vanishingly low volatility, non-toxicity and property tunability. Many polymers were found to dissolve in ILs, and polymer solution properties were measured using the room temperature IL 1-ethyl-3-methylimidiazolium ethylsulfate, [EMIM][EtSO 4], as a model IL. Polyethylene glycol (PEG) dissolves in [EMIM][EtSO 4] above ∼60°C, the neat polymer's melting temperature, and if concentration and molecular weight are high enough, the solution transforms into a semi-transparent gel at lower temperature. Thermoreversible gelation is traced to kinetically frustrated polymer crystallization, a mechanism established previously for many pairings of crystallizable polymer with aqueous or organic solvent. Negatively and positively charged polymers dissolve in [EMIM][EtSO 4], typically over long time periods, and solution chain properties are measured using common physiochemical techniques. Electrostatic interactions of sodium poly(styrene sulfonate) are screened without the need of added salt due to the presence of the charged solvent and size-molecular weight relationships indicate sodium poly(styrene sulfonate) assumes a coiled conformation in solution. Lysozyme dissolves in [EMIM][EtSO4] assuming an expanded conformation with compromised secondary structure, the unfolded structure stabilized by the IL. Preferential solvation of dissolved lysozyme in mixed [EMIM][EtSO 4]/H2O solvents prevents lysozyme aggregation above its denaturation temperature.

Indexing (details)


Subject
Polymer chemistry
Classification
0495: Polymer chemistry
Identifier / keyword
Pure sciences; Ionic liquids; Polymers; Solubility
Title
Interaction of ionic liquid-dissolved polymers
Author
Harner, John M.
Number of pages
168
Publication year
2010
Degree date
2010
School code
0118
Source
DAI-B 71/07, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9781124072487
Advisor
Hoagland, David A.
Committee member
Dubin, Paul L.; Hayward, Ryan C.
University/institution
University of Massachusetts Amherst
Department
Polymer Science & Engineering
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3409586
ProQuest document ID
638631026
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/638631026
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