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In situ silica reinforcement of methyl methacrylate grafted natural rubber by sol–gel process

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Abstract

In situ silica reinforcement of natural rubber (NR) grafted with methyl methacrylate (MMA) (MMA-GNR) was achieved via the sol–gel reaction of tetraethoxysilane (TEOS) by the use of solid rubber and latex solutions. Silica contents within the MMA-GNR as high as 48 and 19 phr were obtained when using the solid rubber and latex solutions, respectively, under optimum conditions. The conversion efficiency of TEOS to silica was close to 95%. The in situ formed silica MMA-GNR/NR composite vulcanizates were prepared. MMA-GNR/NR composite vulcanizates reinforced with the in situ formed silica prepared by either method had similar mechanical properties to each other, but a shorter cure time and higher mechanical properties than those reinforced with the commercial silica at 9 phr. The TEM micrographs confirmed that the in situ formed silica particles were well dispersed within the MMA-GNR/NR composite matrix, whilst the commercial silica particles showed a significant level of agglomeration and a lower level of dispersion.

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Acknowledgments

The funding support from Toyo Tire & Rubber Co. Ltd. (Japan), the Thai Government Stimulus Package 2 (TKK2555) under the Project for Establishment of Comprehensive Center for Innovative Food, Health Products and Agriculture, the National Research University Project of CHE and the Ratchadaphiseksomphot Endowment Fund (AM1024I) are gratefully acknowledged.

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Authors and Affiliations

  1. Program in Petrochemistry and Polymer Science, Chulalongkorn University, Bangkok, 10330, Thailand

    Natchamon Watcharakul

  2. Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand

    Sirilux Poompradub & Pattarapan Prasassarakich

  3. Center for Petroleum, Petrochemical and Advanced Materials, Chulalongkorn University, Bangkok, 10330, Thailand

    Sirilux Poompradub & Pattarapan Prasassarakich

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  1. Natchamon Watcharakul
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  2. Sirilux Poompradub
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  3. Pattarapan Prasassarakich
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Correspondence to Pattarapan Prasassarakich.

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Watcharakul, N., Poompradub, S. & Prasassarakich, P. In situ silica reinforcement of methyl methacrylate grafted natural rubber by sol–gel process. J Sol-Gel Sci Technol 58, 407–418 (2011). https://doi.org/10.1007/s10971-011-2407-x

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  • DOI: https://doi.org/10.1007/s10971-011-2407-x

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