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By Mark D. Dadmun, W. Alexander Van Hook, Donald W. Noid, Yuri B. Melnichenko, Robert G. Sumpter

This article is the broadcast model of many ofthe talks awarded at symposiums held as a part of the Southeast local assembly of the yank Chemical Society (SERMACS) in Knoxville, TN in October, 1999. The Symposiums, entitled answer Thermodynamics of Polymers and Computational Polymer technological know-how and Nanotechnology, supplied shops to offer and talk about difficulties of present curiosity to polymer scientists. It was once, hence, determined to put up either court cases in one quantity. the 1st a part of this assortment includes published types of six of the 10 talks awarded on the Symposium on resolution Thermodynamics of Polymers prepared by means of Yuri B. Melnichenko and W. Alexander Van Hook. the 2 periods, extra defined under, inspired attention-grabbing and provocative discussions. even though now not each writer selected to give a contribution to the lawsuits quantity, the papers which are integrated faithfully symbolize the scope and caliber of the symposium. the rest sections are in response to the symposium on Computational Polymer technological know-how and Nanotechnology geared up by means of Mark D. Dadmun, Bobby G. Sumpter, and Don W. Noid. a various and extraordinary workforce of polymer and fabrics scientists, biochemists, chemists and physicists met to debate contemporary learn within the extensive box of computational polymer technology and nanotechnology. The two-day oral consultation was once additionally complemented by means of a few poster shows. the 1st article of this part is at the vital topic of polymer blends. M. D.

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Wignall, Dimension of polymer chains in critical semidilute solutions, Phys. Rev. Lett. 78: 686 (1997). Y. B. Melnichenko, M. A. Anisimov, A. A. Povodyrev, G. D. Wignall, J. V. Sengers, and W. A. Van Hook, Sharp crossover of the susceptibility in polymer solutions near critical demixing point, Phys. Rev. Lett. 79: 5266 (1997). Y. B. Melnichenko, E. Kiran, G. D. Wignall, K. D. Heath, S. Salaniwal, H. D. Cochran, and M. Stamm, Pressure- and temperature-induced transitions in solutions ofpoly(dimethyl siloxane) in supercritical carbon dioxide, Macromolecules 32: 5344 (1999).

95 g/cm3 [4])due to excluded volume effects, indicating that SC CO2 becomes a good solvent for PDMS. The experimental data agree with the results of Monte Carlo simulations which suggest that polymer chains may adopt unperturbed and expanded conformations at high densities [29] A typical variation of [ vs. 8. 001 [30]) in the region around TC. e. 002 [30]). The crossover takes place at [ - Rg and thus reproduces the main features of the crossover observed in solutions of PS in CH-d [3]. The dimension of the poor solvent domain may be made infinitely large (as in PS-AC) or small (as in PS-CH) depending on the density of SC CO2.

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