Preparation and Properties of Poly(Phenyleneterephthalamide)-Silica Ceramers with Interphase Bonding from Aminophenyltrimethoxysilane

Abstract

Poly(phenyleneterephthalamide) chains having carbonyl chloride end groups were prepared by reacting a mixture ofm- and p--phenylene diamines with terephthaloyl chloride, and were then end-capped with aminophenyl-trimethoxysilane. The polymer thus prepared was used to synthesize a hybrid material in which it was chemically bonded to a silica network producedin-situ by hydrolyzing tetramethoxysilane. Films prepared from this hybrid material were yellow but transparent, and quite tough. The transparency of the films and their mechanical strength were considerably improved relative to the corresponding systems in which the inorganic network was not bonded to the organic phase. Tensile strength was found to increase initially with addition of silica but then to decrease rapidly with further additions. Elongation at rupture also decreased after an initial small increase. A systematic increase in the tensile modulus and hardness with increase in the silica content and a decrease in water absorption were also observed. SEM analysis showed that the silica particle size depends on the silica content, and was 0.5 μm or less. These transparent ceramers were found to withstand tensile stresses the order of 175 MPa and had thermal decomposition temperatures around 460 - 475 ° C, and could thus be very useful in engineering applications at high temperatures.

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References

  1. 1.

    H. Schmidt, Mater. Res. Soc. Svmp. Proc. 180, 961 (1990).

    CAS  Article  Google Scholar 

  2. 2.

    C.J. Brinker and G.W. Scherer, “Sol-Gel Science: the Physics and Chemitry of Sol-Gel Processing”, Academic Press, Boston, 1990.

    Google Scholar 

  3. 3.

    L.L. Hench and J.K. West, Chem. Rev. 90, 33 (1990).

    CAS  Article  Google Scholar 

  4. 4.

    C.J. Brinker et al. (ed), “Better Ceramics through Chemistry”, Vol II, III., Materials Research Society, Pittsburgh, PA, 1986, 1988.

  5. 5.

    L.C. Klein (ed.), “Sol-Gel Technology for Thin Films, Preforms, Electronics, and Specialty Shapes”, Noyes, Park Ridge, NJ, 1988.

    Google Scholar 

  6. 6.

    N.R. Langley, G.C. Mbah, H.A. Freeman, H. Huang, E.J. Siochi, T.C. Ward and G.L. Wilkes, J. Colloid Interface Sei. 143, 309 (1991).

    CAS  Article  Google Scholar 

  7. 7.

    H.-H. Huang, B. Orer and L. Wilkes, Polvm. Bull. 14, 557 (1985).

    CAS  Google Scholar 

  8. 8.

    H.-H. Huang, B. Orler and L. Wilkes, Macromolecules. 20, 1322 (1987).

    CAS  Article  Google Scholar 

  9. 9.

    M. Spinu, A. Brennan, J. Rancourt, G.L. Wilkes and J.E. McGrath, Mater. Res. Soc. Svm. Proc. 175, 179 (1990).

    CAS  Article  Google Scholar 

  10. 10.

    B. Wang, G.L. Wilkes, C.D. Smith and J.E. McGrath, Polvmer Commun. 32, 400 (1991)

    CAS  Google Scholar 

  11. 11.

    K.A. Mauritz and C.K. Jones, J. Appl. Polvm. Sci. 40, 1401 (1990).

    CAS  Article  Google Scholar 

  12. 12.

    B. Wang, G.L. Wilkes, J.C. Hedrick, S.C. Liptak and J.E. McGrath, Macromolecules. 24, 3449 (1990).

    Article  Google Scholar 

  13. 13.

    M. Nandi, J.A. Conklin, L. Salvati Jr. and A. Sen, Chem. Mater. 3, 201 (1991).

    CAS  Article  Google Scholar 

  14. 14.

    R. H. Glaster and G.L. Wilkes, Polvm. Bull. 22, 527 (1989).

    Article  Google Scholar 

  15. 15.

    G. Philipp and H. Schmidt, J. Non-Crvst. Solids. 82, 31 (1986).

    CAS  Article  Google Scholar 

  16. 16.

    A. Morikawa, Y. Iyoku, M. Kakimoto and Y. Imai, Polvm. J. 24, 107 (1992).

    CAS  Google Scholar 

  17. 17.

    M. Nandi, J.A. Conklin, L. Salvati Jr. and A. Sen, Chem. Mater. 2, 772 (1990).

    CAS  Article  Google Scholar 

  18. 18.

    S. Wang, Z. Ahamd and J.E. Mark, Polvm. Bull. 31, 323 (1993).

    CAS  Article  Google Scholar 

  19. 19.

    W. Morgan, J. Polvm. Sci. Part C. 4, 1075 (1963).

    Article  Google Scholar 

  20. 20.

    F. Higassui, S.I. Ogata and Y. Aoki, J. Polvm. Sci. Polvm. Chem Ed. 20, 2085 (1982).

    Google Scholar 

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Ahmad, Z., Wang, S. & Mark, J.E. Preparation and Properties of Poly(Phenyleneterephthalamide)-Silica Ceramers with Interphase Bonding from Aminophenyltrimethoxysilane. MRS Online Proceedings Library 346, 127–134 (1994). https://doi.org/10.1557/PROC-346-127

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