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Infinite dilution activity and diffusion coefficients of several solvents in polystyrene have been measured by inverse gas chromatographic on a capillary column for temperatures between 110 and 170°C. Chromatographic data have been treated according to Khan's model, evaluating the contribution to the peak broadening due to radial and axial molecular diffusion in the mobile phase, radial diffusion in the stationary phase, and interfacial mass transfer resistance. Four capillary columns have been prepared with coating thickness ranging from 0.5 to 3.3 microns in order to determine the minimum thickness necessary to obtain reliable measurements of the diffusion coefficient of the solvent in the polymer in every possible experimental condition. Our experimental data are in considerable agreement with the data already available in the literature, obtained by static and chromatographic methods. © 1994 John Wiley & Sons, Inc.

ContentSEM of the Na 2 CO 3 utilized Preparation of the stock solutions and Schlenk tube Kinetic test for styrene ARGET ATRP with ascorbic acid/Na 2 CO 3 GPC traces of PSs: effect of reaction time and catalyst amount MALLS analyses GPC traces of PSs: effect of dilution with monomer Effect of the EtOAc/EtOH ratio on the polymerization Kinetic investigation Instability of the yellow chromophore Experimental procedure for the isolation of TPMA Reduction of CuCl 2 /TPMA by Na 2 CO 3 in EtOAc/EtOH Linear sweep voltammetry Kinetic comparison between ARGET ATRP with and without ascorbic acid Replacement of Na 2 CO 3 with nitrogen bases Linear sweep voltammetry in S/t-BuOAc/t-BuOH

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