Diffusion of n-alkanes in polydimethylsilicones Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/zc77st32m

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  • Diffusion of short chain n-alkanes was found to be faster in the polydimethylsilicone elastomer SE-30 than in the polydimethylsilicone oil SF-96-2000. The opposite was true for the longer chain n-alkanes suggesting that choice of stationary phase for gas chromatography would depend on the chain length of sample components. The dependence of diffusion on chain length is explained as being the result of competition between the effects of free volume and viscosity for dominance in the diffusion process. Peak skewing was not found to be a problem in SE-30 down to 50°C contrary to previous findings. The equation In K = -1.805 - 0. 590C + (950+905C)/1. 987T was found to be excellent for determining partition coefficients of n-alkanes in SE-30. The entropy and enthalpy for evaporation of n-alkane from SE-30 were determined to be ΔS = 1. 987(1.805+0.590C) cal/deg-mole and ΔH = 950 + 905C cal/mole. The friction coefficient for n-pentane was found to be approximately equal to the reported friction coefficient for a monomer unit of polydimethylsiloxane at 100°C. While friction coefficients for n-alkanes in other polymers have been reported as being linear with carbon number, this was not true for n-alkanes in SE-30 and SF-96-2000.
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