Rheological properties of calcium carbonate-epoxidized natural rubber composites prepared in latex state

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Abstract

Epoxidized natural rubber was prepared by performic acid epoxidation. It was then blended with calcium carbonate dispersion in latex state, which was later coagulated and dried. Rheological properties in terms of Mooney viscosity and shear flow properties were determined. We found that at a given shear rate, the Mooney viscosities, shear stress and shear viscosity increased with increasing levels of epoxide groups in the ENR molecules and increasing loading levels as well as decreasing particle sizes of CaCO3. This is attributed to increased level of chemical interaction between polar functional groups in the ENR molecules with increase in the epoxide content. This gives rise to greater chemical interaction between the ENR and CaCO3 interface upon increase in amount of CaCO3. Greater surface areas of the smaller filler particles also caused higher chemical interaction between difference phases.

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Lohakul, A., Kaesaman, A., Rungvichaniwat, A., & Nakason, C. (2007). Rheological properties of calcium carbonate-epoxidized natural rubber composites prepared in latex state. E-Polymers, 1–11. https://doi.org/10.1515/epoly.2007.7.1.78

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