材料科学
差示扫描量热法
挤压
热重分析
傅里叶变换红外光谱
天然橡胶
塑料挤出
聚丙烯
复合材料
聚乙烯
反应挤出
磨损(机械)
化学工程
热力学
物理
工程类
作者
Anderson Thadeu Nunes,Rubens Eduardo dos Santos,Juliene Sátiro Pereira,Rafael Barbosa,José Donato Ambrósio
标识
DOI:10.1177/1477760618798413
摘要
Waste tire rubber (WTR) supplied by a truck tire retreader were processed in an intermeshing co-rotating twin-screw extruder (ICTSE). The extrusion process evaluated the efficiency of the thermomechanical recycling in the devulcanization of WTR rubbers. Samples were prepared by varying the process parameters, the particles sizes and thermoplastics, and the latter was used as devulcanization auxiliary agents. After extrusion, samples were subjected to solvent extraction to determine the soluble fraction (SF). Subsequently, these SF were characterized by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The highest SF (29 wt%) was obtained with higher screw rotating speed and with smaller particle size. Higher SF indicated a higher degree of devulcanization. The FTIR and DSC analyses showed that natural rubber was the main rubber extracted from extruded samples. In addition, polypropylene was more effective than low-density polyethylene in the devulcanization process, promoting higher SF.
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