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Abstract

Feldspar is being used herein as a filler for recycled polyethyleneterephtalate/natural rubber (R-PET/SMRL) composites. It is found that stabilization torque derived from the Brabender plasticorder decreases with feldspar loading. This scenario is related to the plate like lamellae structure of the feldspar which acts as an internal lubricant. The state of cure (τ_max - τ_mi) is found to decrease with feldspar sand as well, which is due to the dilution effect of the feldspar, i.e., the reduction of the mass fraction of rubbery component. The cure time (t₉₀) and the scorch time (t₂) of the filled R-PET/ SMRL composites is slightly decreases with filler loading. This is attributable the relative high oxide contents. The mechanical properties such as tensile strength and tensile modulus were increased with filler loading. Such observation reveals that the platy feldspar is able to transfer the stress during the external tensile loading. Thermal properties such as onset crystallization temperature shifts to lower values indicating that feldspar has influenced the crystallization of the R-PET. Thermo-gravimetric analysis reveals that the thermal stability of the composites is facilitated with the feldspar dosages.

Keywords

recycled PET SMRL torque scorch time tensile strength.

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On the Potential of Feldspar Sand for Recycled PET/SMRL Composites

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