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Composites prepared by penetrating poly(ethylene oxide) chains into mesoporous silica

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Abstract

Mesoporous silica was synthesized by hydrolysis of tetraethylorthosilicate (TEOS, formula Si(OCH2CH3)4) at ambient temperature in a basic ethanol-water solution, with cetyltrimethyl ammonium bromide as a template. It had a surface area of approximately 1,400 m2/g, and an average pore diameter of approximately 40 Å. Portions were blended into three samples of poly(ethylene oxide) (PEO) of varying molecular weights, in the hope of making novel composites by penetrating some of the PEO chains into the silica channels. Differential Scanning Calorimetry (DSC) and X-ray diffraction (XRD) were used to characterize the structures of the PEO/mesoporous silica composites after they were held at 100 °C for up to 30 min. In both experiments, the melting temperature of the PEO decreased and ultimately disappeared. These results suggest that the PEO chains did penetrate into the silica pores, and since they were constrained in the pores, their crystallization was suppressed. This provides an interesting parallel to the disappearance of the glass transition temperatures of polymers constrained in the cavities of zeolites or in the galleries of intercalated clays.

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Acknowledgments

It is a pleasure to acknowledge the financial support provided by the National Science Foundation through Grant DMR-0075198 (Polymers Program, Division of Materials Research).

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Authors and Affiliations

  1. Department of Chemical Engineering, Yeungnam University, 712–749, Gyungsan, Korea

    G. S. Sur, T. J. Lee & S. G. Lyu

  2. Department of Chemistry and the Polymer Research Center, The University of Cincinnati, Cincinnati, OH, 45221–0172, USA

    H. L. Sun & J. E. Mark

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  1. G. S. Sur
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  2. H. L. Sun
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  3. T. J. Lee
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  4. S. G. Lyu
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  5. J. E. Mark
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Correspondence to J. E. Mark.

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Sur, G.S., Sun, H.L., Lee, T.J. et al. Composites prepared by penetrating poly(ethylene oxide) chains into mesoporous silica. Colloid Polym Sci 281, 1040–1045 (2003). https://doi.org/10.1007/s00396-003-0954-6

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  • DOI: https://doi.org/10.1007/s00396-003-0954-6

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