Interaction Parameter (χ); Expansion Factor (ε); Steric Hindrance Factor (σ); and Shielding Function F(ξ); for the System PEA–Organic Solvents by Intrinsic Viscosity Measurements
Keywords:Flory binary interaction parameter, hydrodynamic properties of poly(ethylene adipate), Stockmayer-Fixman (SF) hydrodynamic model, Debye-Bueche solution theory, intrinsic viscosity
Abstract. In this work we present experimental data of the Flory binary interaction parameter, χ, of poly (ethylene adipate) PEA, a plasticizer material. We have used the viscometric method for measuring dilute PEA solutions in good solvents: benzene, chloroform and acetone. A procedure based on the Stockmayer-Fixman, (SF), hydrodynamic solutions theory, allows us to evaluate some thermodynamic parameters via the intrinsic viscosity [η], measured in several good solvents. This method also estimates the unperturbed parameter, kθ, and the steric hindrance parameter, (σ), by viscosity measurements at constant temperature of 30°C. By correlation of the molecular weight (M) and intrinsic viscosity data, according to the Stockmayer-Fixman (SF) solution theory model, values of Flory binary interaction parameter χ, equal to χ1,2 =0.1544 ± 0.01; χ1,2 =0.1631 ± 0.01; and χ1,2 =0.1922 ± 0.01, for PEA in benzene, chloroform and acetone, respectively, were obtained. In addition we applied the Debye-Bueche theory, in order to estimate values of: expansion factor (ε), shielding factor (ξ) and depth of shielding (L) for the system PEA-organic solvents, by [η] and (M) experimental data correlation. The results confirm that values obtained, correspond to “good solvents” for the PEA polymer.
2. Huggins, M. L.; Ann. N. Y. Acad. Sci. 1942, 1, 43.
3. Stockmayer W. H.; J. Polym. Sci. Part C 1963, 1, 137.
4. Rabek J. F.; Experimental Methods in Polymer Chemistry, Wiley & Sons: New York, 1980, ch. 2.
5. Fedors R.F.; Polym. Eng. Sci. 1974, 14, 147.
6. Cecopieri-Gómez M. L.; M.Sc. Dissertation, Universidad Nacional Autónoma de México, Faculdad Química, México, 1998.
7. Elias H. G.; Macromolecules, Plenum Press: New York, 1995, vol. I, ch. 9.
8. Allen, G.; Bevington, J. C.; Comprehensive Polymer Science, Ed. Pergamon Press: N.Y., 1989, ch. 17.
9. Mc Caffery, E.; Laboratory Preparation for Macromolecular Chemistry, Ed. Mc. Graw Hill Book Co.: New York, 1970.
10. Pethrick, R. A.; Polymer Year Book 3, Institute of Chemical Physics, USSR, Academy of Science, Harwood Academy Publishers: Moscow, 1986.
11. D 446-89; Standard Specifications and Operating Instructions for Glass Capillary Kinematic Viscometers, Annual Book of ASTM Standards, vol. 05.01, Dec. 1989.
12. D 2857-87; Standard Practice for Diluted Solution Viscosity of Polymers, Annual Book of ASTM Standards, vol. 08.01, Oct., 1987.
13. Chee, K.; Polymer 1987, 28, 977.
14. Yamakawa, H.; Modern Theory of Polymer Solutions, Ed. Harper and Row: New York, 1971, ch. 6.
15. Azim, A.; Azim, A.; Huglin, M. B.; Polymer 1984, 25, 803.
16. Cecopieri-Gomez, M. L.; Palacios-Alquisira, J.; Rev. Soc. Quim. Mex. 2001, 45, 82.
17. David, L. R., ed.; CRC Handbook of Chemistry and Physics, 74th ed., CRC Press: Ann Arbor, 1993-1994.
18. Reid, R. C.; Prausnitz, J. M.; Poling, B. E.; The Properties of Gases and Liquids, 4th ed., Mc. Graw Hill, Book Co.: New York, 1987.
19. The Sigma-Aldrich Library of Chemical Safety Data , Sigma-Aldrich Corp.: Milwaukee, Wisconsin, USA., 1988, (Sigma: 314-771-5765; Aldrich: 414-273-3850).
20. Burrell, H.; Immergut B. In Polymer Handbook, Brandrup, J.; Immergut, E. H., eds., IV-341, Interscience Publish: N. Y., 1966.
21. Seymour, R. B.; Carraher, CH. E.; Polymer Chemistry, 2nd ed., Marcel Dekker Inc.: New York, 1988, ch. 3.
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