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- E-ISSN 2288-8985
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- E-ISSN2288-8985
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A Study Effect of Mixed Solvents on the Retention of Polystyrenes Using Thermal Field-Flow Fractionation
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1993, v.6 no.5, pp.453-462
Lee,
D., Jeon,
S., &
Park,
W.
(1993). A Study Effect of Mixed Solvents on the Retention of Polystyrenes Using Thermal Field-Flow Fractionation. Analytical Science and Technology, 6(5), 453-462.
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Abstract
The retention behaviors of polystyrenes influenced by mixed solvents are examined in thermal field-flow fractionation(ThFFF). Experimental data are obtained with polystyrene samples of molecular weights of 35,000, 110,000, 200,000 and 470,000 dissolved in organic solvents. The pure and mixed solvents are tetrahydrofuran(THF), chloroform(CHL), cyclohexane(CH), and benzene(BZ), respectively. The values of retention ratio(R) and thermal diffusion coefficient(<TEX>$D_T$</TEX>) are measured with change of molecular weight and composition of mixed solvents. Atempts are then made to correlate the measured values with various physicochemical parameters of polymers and solvents. Studies suggest that R is significantly increased with the density of solvent and a good correlation is found between them. <TEX>$D_T$</TEX> values decreases in the mixed solvent having has a higher concentration of poor solvent.
- keywords
- Thermal field-flow fractionation, Retention behavior, Retention ratio, thermal diffusion coefficient
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