Surface characterization of micrometre-sized, polypyrrole-coated polystyrene latexes: verification of a ‘core–shell’ morphology

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Stuart F. Lascelles, Steven P. Armes, Peter A. Zhdan, Stephen J. Greaves, Andrew M. Brown, John F. Watts, Stuart R. Leadley and Shen Y. Luk


Abstract

Micrometre-sized, polypyrrole-coated polystyrene latexes with various conducting polymer loadings have been extensively characterized using X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectroscopy (TOF-SIMS), Raman and UV–VIS reflectance spectroscopy, scanning force microscopy (SFM) and scanning electron microscopy (SEM). Both XPS and TOF-SIMS studies are consistent with relatively uniform, chloride-doped polypyrrole overlayers. Raman studies also indicated a ‘core–shell’ morphology since only bands attributable to polypyrrole were observed; no evidence was found for the underlying polystyrene component even at the lowest polypyrrole loadings. This is most likely due to remarkably efficient attenuation of the polystyrene bands by the highly absorbing polypyrrole overlayer. UV–VIS reflectance spectroscopy studies confirmed that a coated latex had a much lower reflectance (higher absorbance) than a heterogeneous admixture of polypyrrole and polystyrene with a similar polypyrrole content. High-resolution images of the polypyrrole overlayer nanomorphology were obtained using SFM. At low polypyrrole loadings (1.0 mass%) the overlayer was relatively smooth and uniform, but higher loadings (8.9 mass%) resulted in a rougher, more globular morphology. Finally, the underlying polystyrene latex ‘core’ was quantitatively removed by solvent extraction. SEM studies of the polypyrrole residues revealed a ‘broken egg-shell’ morphology, thus providing irrefutable evidence for the ‘core–shell’ morphology of the original polystyrene/polypyrrole particles.


References

  1. S. F. Lascelles and S. P. Armes, Adv. Mater., 1995, 7, 864 CAS.
  2. S. F. Lascelles and S. P. Armes, J. Mater. Chem., preceding paper Search PubMed.
  3. (a) A. R. Goodall, M. C. Wilkinson and J. Hearn, J. Polym. Sci. , Polym. Chem. Ed., 1977, 15, 2193 CrossRef CAS; (b) C. W. A. Bromley, Colloids Surf., 1986, 17, 1 CrossRef CAS.
  4. (a) A. J. Paine, W. Luymes and J. McNulty, Macromolecules, 1990, 23, 3104 CrossRef CAS; (b) C. K. Ober, K. P. Lok and M. L. Hair, J. Polym. Sci., Polym. Lett., 1985, 23, 103 Search PubMed.
  5. H. Ge, P. R. Teasdale and G. G. Wallace, J. Chromatogr., 1991, 544, 305 CrossRef CAS.
  6. (a) H. Kawaguchi, Microspheres for Diagnosis and Bioseparation in Polymer Materials for Bioanalysis and Bioseparation, ed. T. Tsuruta et al., CRC Press, London, 1993 Search PubMed; (b) P. J. Tarcha, D. Misun, M. Wong and J. J. Donovan, Polymer Latexes: Preparation, Characterisation and Applications, ed. E. S. Daniels, E. D. Sudol and M. S. El-Aassar, ACS. Symp. Ser. no. 492, 1992, 22, 347 Search PubMed; (c) M. R. Pope, S. P. Armes and P. J. Tarcha, Bioconjugate Chem., 1996, 7, 436 CrossRef CAS.
  7. D. B. Cairns, S. P. Armes, M. M. Chehimi, M. Delamar and S. Y. Luk, Macromolecules, to be submitted Search PubMed.
  8. (a) A. E. Wiersma and L. M. A. vd Steeg, Eur. Pat., 589 529 Search PubMed; (b) A. E. Wiersma, L. M. A. vd Steeg and T. J. M. Jongeling, Synth. Met., 1995, 71, 2269 CrossRef CAS.
  9. C. Perruchot, M. M. Chehimi, M. Delamar, S. F. Lascelles and S. P. Armes, Langmuir, 1996, 12, 3245 CrossRef CAS.
  10. J. C. Vickerman, A. Brown and N. M. Reed, Secondary Ion Mass Spectrometry: Principles and Applications, Clarendon Press, Oxford, 1989 Search PubMed.
  11. B. Drake, C. B. Prater, A. L. Weisenhorn, S. A. C. Gould, T. R. Albrecht, C. F. Quate, D. S. Cannell, H. G. Hansma and P. K. Hansma, Science, 1989, 243, 1586 CrossRef CAS.
  12. Y. Deslandes, D. F. Mitchell and A. J. Paine, Langmuir, 1993, 9, 1468 CrossRef CAS.
  13. (a) M. M. Chehimi, S. F. Lascelles and S. P. Armes, Chromatographia, 1995, 41, 671 CAS; (b) M. M. Chehimi, M. L. Abel, Z. Sahraoui, K. Fraoua, S. F. Lascelles and S. P. Armes, Int. J. Adhes. Adhes., 1997, 17, 1 CrossRef CAS.
  14. (a) M. L. Abel, S. R. Leadley, A. M. Brown, J. Petitjean, M. M. Chehimi and J. F. Watts, Synth. Met., 1994, 66, 85 CrossRef CAS; (b) S. Y. Luk, W. Lineton, M. Keane, C. DeArmitt and S. P. Armes, J. Chem. Soc., Faraday Trans., 1995, 91, 905 RSC.
  15. R. S. Venkatachalam, F. J. Boerio, P. G. Roth and W. H. Tsai, J. Polym. Sci., Part B: Polym. Phys., 1988, 26, 2447 CrossRef CAS.
  16. (a) C. H. Jones and I. J. Wesley, Spectrochim. Acta, Part A, 1991, 47, 1293 CrossRef; (b) R. A. Nyquist, C. L. Putzig, M. A. Leugers, R. D. McLachlan and B. Thill, Appl. Spectrosc., 1992, 46, 981 CAS.
  17. C. M. Jenden, R. G. Davidson and T. G. Turner, Polymer, 1993, 34, 1649 CrossRef CAS.
  18. (a) F. Tuinstra and J. L. Koenig, J. Chem. Phys., 1970, 53, 1126 CrossRef CAS; (b) M. A. Tadayyoni and N. R. Dando, Appl. Spectrosc., 1991, 45, 1613 CAS.
  19. M. J. Hearn, I. W. Fletcher, S. P. Church and S. P. Armes, Polymer, 1993, 34, 262 CrossRef CAS.
  20. S. P. Armes, M. Aldissi, M. Hawley, J. G. Beery and S. Gottesfeld, Langmuir, 1991, 7, 1447 CrossRef CAS.
  21. S. P. Armes, S. Gottesfeld, J. G. Beery, F. Garzon, M. Mombourquette, M. Hawley and H. H. Kuhn, J. Mater. Chem., 1991, 1, 525 RSC.
  22. S. Shen, M. S. El-Aasser, V. L. Dimonie, J. W. Vanderhoff and E. D. Sudol, J. Polym. Chem., Part A: Polym. Chem., 1991, 29, 857 Search PubMed.
  23. F. P. Bradner, J. S. Shapiro, H. J. Bowley, D. L. Gerrard and W. F. Maddams, Polymer, 1989, 30, 914 CrossRef CAS.
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