Abstract
Hybrid organic-inorganic composites were prepared by precipitating silica into hydroxypolybenzoxazole (HPBO) and sulfopolybenzobisthiazole (SPBT) polymers, with interfacial bonding between the phases improved by use of isocyanatopropyltriethoxy silane and N, N-diethylaminopropyltrimethoxy silane, respectively. The materials were transparent, and scanning electron micrographs indicated a uniform distribution of silica particles of domain sizes less than 1 μm. Values of the tensile modulus and tensile strength of the HPBO-silica composites were found to increase with the silica content. Values of the modulus of the SPBT-silica composites also increased in this manner, but the improvements in tensile strength were nearly independent of the amount of silica. The composites exhibited thermal decomposition temperatures of approximately 400–500°C, and the thermal stability was significantly increased for both HPBO and SPBT materials with increase in silica content. The water absorption amount for both types of composites decreased significantly compared to that of the pure polymers, suggesting excellent weatherability.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
J.P.Crichley, G.J.Knight and W.W.Wright, Heat Resistant Polymers (Plenum Press, New York, 1983).
C.J.Brinker and G.W.Scherer, Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing (Academic Press, San Diego, 1990).
J.A.Manson and L.H.Sperling, Polymer Blends and Composites (Plenum Press, New York, 1976).
L.H.Sperling, Interpenetrating Polymer Networks and Related Materials (Plenum Press, New York, 1981).
B.M.Novak, Adv. Mater. 5, 422 (1993).
A.Morikawa, Y.Ioku, M.Kakimoto, and Y.Imai, J. Mater. Chem 2, 679 (1992).
S.Wang, Z.Ahmad, and J.E.Mark, Macromol. Sci., Macromol. Reports A31, 411 (1994).
S.Wang, Z.Ahmad, and J.E.Mark, in Better Ceramics Through Chemistry, Part V, edited by C.Sanchez, C.J.Brinker, M.L.Mecartney, and A.Cheetham (Materials Research Society, Pittsburgh, 1994).
S.Wang, Z.Ahmad, and J.E.Mark, Chem. Mater., 6, 943 (1994).
J.E.Mark, S.Wang, and A.Ahmad, manuscript submitted to Hybrid Organic-Inorganic Composites, edited by J.E.Mark, C.Y.-C.Lee, and P.A.Biaconi (American Chemical Society, Washington, 1994).
J.F.Wolfe in Encyclopedia of Polymer Science and Engineering, Vol. 11, edited by H.F.Mark, N.M.Bikales, C.G.Overberger, G.Menges, and J.I.Kroschwitz (John Wiley & Sons, New York, 1987), p. 635.
12.P.E.Cassidy, Thermally Stable Polymers (Marcel Dekker, New York, 1980).
J.P.Chen, Z.Ahmad, S.Wang, J.E.Mark, and F.E.Arnold, in Hybrid Organic-Inorganic Composites, edited by J.E.Mark, C.Y.-C.Lee, and P.A.Biaconi (American Chemical Society, Washington, 1995).
T.D.Dang, J.P.Chen, and F.E.Arnold, in Hybrid Organic-Inorganic Composites, edited by J.E.Mark, C.Y.-C.Lee, and P.A.Biaconi (American Chemical Society, Washington, 1995).
J.E. Mark and coworkers, research in process.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Premachandra, J., Kumudinie, C., Zhao, W. et al. Polymer-silica hybrid materials prepared from some functionalized polybenzoxazoles and polybenzobisthiazoles. J Sol-Gel Sci Technol 7, 163–175 (1996). https://doi.org/10.1007/BF00401035
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00401035