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Temperature-Dependent Vapor Pressure of Selected Cyclic and Linear Polydimethylsiloxane Oligomers

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Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, Ontario, Canada, M5S 3E5, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada, M5S 3H6, and Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, Ontario, Canada, M1C 1A4
* To whom correspondence should be addressed. E-mail address: [email protected]
†Department of Chemical Engineering and Applied Chemistry, University of Toronto.
‡Department of Chemistry, University of Toronto.
§Department of Physical and Environmental Sciences, University of Toronto Scarborough.
Cite this: J. Chem. Eng. Data 2010, 55, 12, 5868–5873
Publication Date (Web):November 30, 2010
Copyright © 2010 American Chemical Society

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    The isothermal retention times of seven cyclic (D4 to D10) and nine linear (L5 to L13) dimethylsiloxane oligomers on a nonpolar gas chromatographic column were determined at temperatures between (308.15 and 438.15) K. Using normal alkanes as standard reference and calibration compounds, these retention times were used to derive liquid state vapor pressures at 298.15 K as well as enthalpies of vaporization that allow for the estimation of vapor pressures over a wide range of temperatures. The data agree within 0.25 log units with vapor pressure values previously reported by Flaningam (1986) but extend those values to lower temperatures and larger oligomers. Cyclic dimethylsiloxanes are more volatile than linear dimethylsiloxanes of a similar size. Oligomers with 10 and more dimethylsiloxane units are expected to sorb appreciably to aerosol at environmentally relevant temperatures.

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    Triplicate retention times for the compounds for which tridecane, octadecane, and pentadecane serve as the standard reference compound (Tables S1, S2, and S3, respectively) and for linear alkanes that served as the standard reference and calibration compounds (Table S4) and vapor pressure data for the used calibration compounds (Table S5). This material is available free of charge via the Internet at

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