Abstract

As vehicles are on the rise globally, so is tire disposal when out of service. One potential recycling process is turning the waste tire into a useful composite by incorporating it with thermoplastic materials. In the present work, composite based on waste tire rubber (WTR) and polypropylene (PP) were developed using a single screw filament extruder for various concentrations of WTR (20, 40, 60, and 80% wt.). Physical and morphological characterization of WTR (425 µm) and WTR-PP composite was performed; furthermore, mechanical characterization of WTR-PP composites was also carried out under the tensile load. Morphological observation reveals that WTR-PP with low WTR content shows comparatively better distribution, maintaining the necessary strength and thermoplasticity of the composite compared to the higher WTR content in the composite. The tensile study shows that incorporating WTR with polypropylene decreased tensile strength but improved elongation at break. The macrofractography is carried out to study the failure origin and crack propagation in the WTR-PP composite.

摘要

随着全球车辆数量的增加，报废轮胎的处理也在增加。一种潜在的回收工艺是将废轮胎与热塑性材料结合，将其转化为有用的复合材料。在目前的工作中，使用单螺杆长丝挤出机开发了基于废轮胎橡胶 (WTR) 和聚丙烯 (PP) 的复合材料，适用于各种 WTR 浓度（20、40、60 和 80% wt.）。对 WTR (425 µm) 和 WTR-PP 复合材料进行了物理和形态表征；此外，还对 WTR-PP 复合材料在拉伸载荷下进行了力学表征。形态观察表明，与较高WTR含量的复合材料相比，低WTR含量的WTR-PP表现出相对更好的分布，保持了复合材料必要的强度和热塑性。拉伸研究表明，将 WTR 与聚丙烯结合会降低拉伸强度，但会提高断裂伸长率。通过宏观断口分析来研究 WTR-PP 复合材料的失效起源和裂纹扩展。