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Journal of Polymer Research

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01-07-2019 | ORIGINAL PAPER

Devulcanization of natural rubber compounds by extrusion using thermoplastics and characterization of revulcanized compounds

Authors: Rafael Barbosa, José Donato Ambrósio

Published in: Journal of Polymer Research | Issue 7/2019

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Abstract

Rubber recycling is a subject of high interest, regarding the complexity to develop a feasible method for material recovery without main chain degradation. In this research, Natural Rubber compounds were thermomechanically devulcanized in a continuous way through a co-rotating and intermeshing twin-screw extruder. Four process parameters were evaluated: screw rotation speed, barrel temperature, sulfur concentration and auxiliary thermoplastics (PP or EVA). Devulcanized samples were characterized by their soluble fraction, crosslink density, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and Fourier-transform infrared spectroscopy (FTIR), demonstrating the rising of free natural rubber chains concentration after extrusion. Horikx theory was also used for qualitative analysis. The samples were revulcanized with or without virgin rubber compound addition and characterized by tensile, hardness and dynamic-mechanical tests (DMA). Better mechanical performances were achieved using thermoplastics due to greater second phase incorporation confirmed by scanning electron microscopy (SEM). Compounds extruded with EVA showed even better properties retention, with values around 86% for tensile strength, 110% for elongation at break and 99% for hardness, indicating this material as a promising assistant in vulcanized rubber recycling.

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Title: Devulcanization of natural rubber compounds by extrusion using thermoplastics and characterization of revulcanized compounds
Authors: Rafael Barbosa
José Donato Ambrósio
Publication date: 01-07-2019
Publisher: Springer Netherlands
Published in: Journal of Polymer Research / Issue 7/2019
Print ISSN: 1022-9760
Electronic ISSN: 1572-8935
DOI: https://doi.org/10.1007/s10965-019-1820-7

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