Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
권호 표지
DOI QR코드

DOI QR Code

Analysis of Excluded Volume Effect in Theta Solvent Systems of Polymethyl Methacrylate and Polystyrene by Means of a Modified Scaled Temperature Parameter

  • Published : 20011100
Download PDF
⟨ Previous Next ⟩

Abstract

The expansion of two different kinds of hydrodynamic size of polymethyl methacrylate (PMMA Mw: 1.56- 2.04 ${\times}$ 106 g/mol) has been measured by dynamic light scattering and viscometry above the Flory $\theta$ temperature of the variou s solvents such as n-butyl chloride, 3-heptanone, and 4-heptanone. The expansion of PMMA chains was analyzed in terms of universal temperature parameters and also compared with previous results of polystyrene (PS) system. First it was found that simple $\tau/{\tau}c$ parameter no longer had its universality for the expansion behavior of hydrodynamic size in the chemically different linear polymer chains. However after modifying ${\tau}/{\tau}c$ parameter into $(Mw/Ro2)3}2(\tau/\tauc)$, we observed a much better universality for both PMMA and PS systems. Here Mw, Ro, $\tau[=(T-{\theta}$)/${\theta}$]$, and ${\tau}c[=({\theta}-Tc)/Tc]$ are defined as the weight average molecular weight, the unperturbed end-to-end distance, the reduced temperature and the reduced critical temperature, respectively.

Keywords

References

  1. Principles of Polymer Chemistry Flory, P. J.
  2. Modern Theory of Polymer Solutions Yamakawa, H.
  3. Scaling Concepts in Polymer Physics de Gennes, P. G.
  4. J. Phys. Lett v.36;39 de Gennes, P. G.
  5. Macromolecules v.18;21 Sanchez, I. C.;
  6. J. Phys. Fr. v.39 Farnoux, B.;Boue, F.;Cotton, J. P.;Daoud, M.;Jannink, G.;Nierlich, M.;de Gennes, P. G.
  7. Macromolecules v.12 Akcasu, A. Z.;Han, C. C.
  8. Macromolecules v.13 Francois, J.;Schwartz, T.;Weill, G.
  9. Macromolecules v.14 Akcasu, A. Z.;Benmouna, M.;Alkhafaji, S.
  10. J. Chem. Phys. v.78 Oono, Y.;Kohmoto, M.
  11. Macromolecules v.17 Douglas, J. F.;Freed, K. F.
  12. Macromolecules v.10 Adam, M.;Delsanti, M.
  13. Macromolecules v.16 Vidakovic, P.;Rondelez, F.
  14. J. Phys. Fr. v.39 Daoud, M.;Jannink, G.
  15. Polymer v.33 Dondos, A.
  16. Macromolecules v.26 Dondos, A.
  17. Macromolecules v.25 Park, I. H.;Kim, J.-H.;Chang, T.
  18. Macromolecules v.27 Park, I. H.
  19. Macromolecules v.31 Park, I. H.
  20. Viscosity of Polymer Solutions Bohdanecky, M.;Kovar, J.
  21. In Dynamic Light Scattering, The Method and Some Applications no.4 Stepanek, P.;Brown. W.(ed.)
  22. In Light Scattering from Polymer Solutions no.7 Kratochvil, P.;Huglin, M. B.(ed.)
  23. In Dynamic Light Scattering, The Method and Some Applications no.6 Brown, W.;Nicolai, T.;Brown, W.(ed.)
  24. Rev. Sci. Instrum. v.60 Chu, B.;Wang, Z.;Park, I. H.;Tontisakis, A.
  25. J. Chem. Phys. v.105 Xia, K.-Q.;An, X.-Q.;Shen, W.-G.