Hostname: page-component-76fb5796d-qxdb6 Total loading time: 0 Render date: 2024-04-26T02:31:40.292Z Has data issue: false hasContentIssue false
  • English
  • Français

Compatibilization Mechanism of Polyimide-Silica Hybrids with Organofunctional Trialkoxysilanes

Published online by Cambridge University Press:  10 February 2011

J. D. C. Menoyo ,
L. Mascia  and
S.J. Shaw
J. D. C. Menoyo
Affiliation:
Institute of Polymer Technology and Materials Engineering, Loughborough University, Loughborough LE1 1 3TU, United Kingdom, I.mascia@lboro.ac.uk.
L. Mascia
Affiliation:
Institute of Polymer Technology and Materials Engineering, Loughborough University, Loughborough LE1 1 3TU, United Kingdom, I.mascia@lboro.ac.uk.
S.J. Shaw
Affiliation:
Structural Materials Centre, Defence Evaluation and Research Agency, Farnborough GU14 OLX, United Kingdom
Get access

Abstract

The polyimide hybrids that have been most widely studied by the authors contain a silica phase produced from tetraethoxysilane by the sol-gel method. Despite the expected strong interactions, through H-bonds, between the polyamic acid precursor for the polyimide and the large number of hydroxyl groups from the silica phase, it is rather difficult to prevent phase separation and rapid coarsening of the morphology upon removal of the solvent from the original solution mixture. These systems can be compatibilized, however, with the selective use of functionalized trialkoxysilane coupling agents, such as glycidyl and isocyanate types.

In the present work we have established that compatibilty is achieved only upon exceeding a critical concentration of coupling agent, which increases linearly with the total silica content up to a certain level. This was found to be connected with the ability of the coupling agent to displace the strongly associated solvent molecules with the amic acid units of the polymer chains in order to develop the required level of interactions across the interface between the organic and inorganic components.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 520: Symposium P – Nanostructured Powders & Their Industrial Application , 1998 , 239
Copyright
Copyright © Materials Research Society 1998

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Brinker, C.J. andScherer, G.W., The Physics and Chemistry of Sol-Gel Processing, Academic Press, New York (1990).Google Scholar
2. Uhlmann, C.R. andUlrich, D.R., Eds., Ultrastructure Processing of Advanced Materials, Wiley, New York, 1992.Google Scholar
3. Pope, E.J.A., Sakka, S. and klein, L.C., Eds., Sol-Gel Science and Technology, Vol. 55, American Chemical Society, Westerville, OH, 1995.Google Scholar
4. Hasegawa, I. andSaaka, S., J. Non-Cryst. Solids 100 201 (1988)Google Scholar
5. Schaefer, D.W. andMark, J.E., Eds., Polymer Based Molecular Composites, Vol. 171, Materials Research Society, Pittsburgh, 1990 Google Scholar
6. Wang, H.H., Wilkes, G.L. andCarlson, J.G., Polymer 30 2001 (1989)Google Scholar
7. Nandi, M., Conklin, J.A., Salvati, L. Jr. andSen, A., Chem. Mater. 3 201 (1991).Google Scholar
8. Morikawa, A., lyoku, Y., Kakimoto, M. andImai, Y., Polym. J. 24 107 (1992).Google Scholar
9. Morikawa, A., lyoku, Y., Kakimoto, M. andImai, Y., J. Mater. Chem. 2 679 (1992).Google Scholar
10. iyoku, Y., Kakimoto, M. andImai, Y., High Perform. Polym. 9 95 (1994).Google Scholar
11. Morikawa, A., Yamaguchi, H., Kakimoto, M. andImai, Y., Chem. Mater. 6 913 (1994).Google Scholar
12. Kioul, A. andMascia, L., J. Non-Cryst. Solids 175 169 (1994).Google Scholar
13. Wang, S., Ahmad, Z. andMark, J.E., Chem. of Mater. 6 943 (1994).Google Scholar
14. Mascia, L. andKioul, A., Polymer 36 3649 (1995).Google Scholar
15. Inoue, T., Prog. Polym. Sci. 20 119 (1995).Google Scholar
16. Saegusa, T., J. Macrom. Sci. Chem. A 28 817 (1991).Google Scholar