Comparisons of Polymer/Gas Partition Coefficients Calculated from Responses of Thickness Shear Mode and Surface Acoustic Wave Vapor Sensors

Analytical Chemistry

Volumn 70, Issue 1, 1998, Pages 199-203

  Grate, Jay W ^a   Kaganove, Steven N ^a   Bhethanabotla, Venkat R ^b  

^a PACIFIC NORTHWEST NATIONAL LABORATORY   (United States)

^b University of South Florida   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0001235314     PISSN: 00032700     EISSN: None     Source Type: Journal    
DOI: 10.1021/ac970608z     Document Type: Article

References (32)

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4. We obtain a log K value for perchloroethylene on PDMS of 3.26 from the response of a 200 MHz SAW sensor with a 35 nm thick coating. Bodenhofer et al. found log K values from 3.19 to 3.37.
5. 3 or lower, with data reported primarily for perchloroethylene.
6. PIB (Aldrich), PECH (Aldrich), and cis-PBD (Aldrich) were solid, rubbery polymers. PDMS (Petrarch) was a slowly pourable liquid with a viscosity of 65 000 cP.
7. All films were applied by spray coating to plasma-cleaned sensor surfaces and are not necessarily uniform, especially on the SAW devices. Film material was distributed on both sides of the TSM devices. Films were examined by optical microscopy before and after vapor exposures to be certain that dewetting problems had not occurred.
8. The film thicknesses on the TSM devices (International Crystal Manufacturers) in kilohertz and nanometers were (polymer, kHz, nm) PIB, 20.3, 960; PECH, 21.2, 680; PBD, 5.2, 900; and PDMS, 20.9, 940. The nominal thicknesses in nanometers were calculated from the kilohertz values and the Sauerbrey equation, assuming a uniform thin film and mass effects only.
9. The film thicknesses on the SAW devices (Femtometrics) in kilohertz and nanometers were (polymer, kHz, nm) PIB, 140, 30; PECH, 173, 25; PBD, 208, 41; and PDMS, 169, 35. The nominal thicknesses in nanometers were calculated from the kilohertz values and the Sauerbrey equation, assuming a uniform thin film and mass effects only.
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27. Results from both McCrum and Martin indicate a dynamic glass transition temperature for PIB at frequencies of 100 MHz or higher of 313 K or higher.
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29. The static glass transition temperature of PECH is 251 K, so its dynamic glass transition temperature at megahertz frequencies will likely be well above 298 K.
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31. It is noteworthy that these authors used 700 nm thick films applied by spin-coating. These are undoubtedly continuous films. Therefore, the enhancement of the SAW response that we attribute to modulus contributions is not an artifact of discontinuous films applied by spray-coating.
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