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Effect of multi-walled carbon nanotubes on the physical properties and crystallisation of recycled PET/TPU composites

机译：多壁碳纳米管对再生PET / TPU复合材料物理性能和结晶的影响

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Thermoplastic polyurethane (TPU) was blended with recycled polyethylene terephthalate (rPET) to prepare rPET/thermoplastic polyurethane (TPU) composites. Meanwhile, multiple-walled carbon nanotubes (MWCNTs) were employed as a reinforcing filler to study the synergistic effect between CNTs and rPET/TPU composites. The effect of CNT content on the morphology and micro-structure of the composites was investigated using a scanning electron microscope (SEM) and X-ray diffraction (XRD). The thermal properties were characterized using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA). The mechanical properties were investigated using tensile tests and hardness measurements. The results showed that TPU was compatible with rPET. The existence of rPET changed the crystalline phase and affected the glass transition and crystallisation temperature of the TPU matrix. The rPET/TPU composites displayed poor thermal stability and tensile properties when compared to pure TPU. The addition of CNTs had no effect on the crystalline phase of the rPET/TPU composites. Due to the occurrence of interfacial adhesion between the CNTs and rPET, the CNTs displayed an offset effect on the reaction of rPET and decreased the rigidity of the molecular chain in the rPET/TPU composites. The thermal stability and tensile strength of the CNTs/rPET/TPU composites improved with an increase in CNT content.
机译：将热塑性聚氨酯（TPU）与回收的聚对苯二甲酸乙二醇酯（rPET）混合以制备rPET /热塑性聚氨酯（TPU）复合材料。同时，以多壁碳纳米管（MWCNTs）为增强填料，研究了CNT与rPET / TPU复合材料之间的协同作用。使用扫描电子显微镜（SEM）和X射线衍射（XRD）研究了CNT含量对复合材料的形态和微观结构的影响。使用差示扫描量热法（DSC），热重分析（TGA）和动态力学分析（DMA）表征热性能。使用拉伸试验和硬度测量研究了机械性能。结果表明，TPU与rPET相容。 rPET的存在改变了结晶相，并影响了TPU基质的玻璃化转变和结晶温度。与纯TPU相比，rPET / TPU复合材料显示出较差的热稳定性和拉伸性能。 CNT的添加对rPET / TPU复合材料的结晶相没有影响。由于在CNT与rPET之间发生界面粘附，因此CNT显示出对rPET反应的抵消作用，并降低了rPET / TPU复合材料中分子链的刚性。 CNT / rPET / TPU复合材料的热稳定性和拉伸强度随CNT含量的增加而提高。

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