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Kaolin reinforced rubbers : physical dependance between cristallinity and mechanical properties

Abstract : A long time ago, the properties of rubber-kaolinite composite materials have been described as a function of the amount of mica-like components and order-disorder properties of the kaolinite. If the mica negative contribution could be simply identified as due to the easy 001 cleavage of coarser illites, the contribution of crystalline order of kaolinite was more difficult to identify. The Mössbauer spectroscopy of disordered kaolinites shows that the real kaolinite contains sites with FeII-FeII-lacuna octahedral occupation, then developing materials with necessary cation compensation sites. According to the shape analysis developed from low temperature nitrogen adsorption, and calculations of the average surface of an exchangeable site on the lateral surface of kaolinite, it is possible to evaluate that the FeII-FeII-lacuna sites are in continuous sheets, leading to some kind of exchangeable material looking like swelling clays. Paying account of the solvation of the compensating ions, as shown by the water adsorption on pure smectite, it can be evaluated that such layers, mainly the Ca++ compensated forms, vehicles water that slows down the vulcanization process, leading to non reactive alcohol groups on diene latex molecules, and then perturbing the reticulation process.
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Submitted on : Thursday, April 20, 2017 - 3:56:37 PM
Last modification on : Tuesday, October 19, 2021 - 7:01:26 PM


  • HAL Id : hal-01511252, version 1


Jacques Yvon, T. Delineau, Frédéric Diot, Ndue Kanari. Kaolin reinforced rubbers : physical dependance between cristallinity and mechanical properties. International October Conference on Mining and Metallurgy (IOC 2014), 2014, Bor, Serbia. ⟨hal-01511252⟩



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