Sobrinho Edson Duarte de Melo, Ferreira Eduardo da Silva Barbosa, da Silva Flávio Urbano, Bezerra Elieber Barros, Wellen Renate Maria Ramos, Araújo Edcleide Maria, Luna Carlos Bruno Barreto
Academic Unit of Mechanical Engineering, Federal University of Campina Grande, Av. Aprígio Veloso, 882-Bodocongó, Campina Grande 58429-900, Paraíba, Brazil.
Academic Unit of Materials Engineering, Federal University of Campina Grande, Av. Aprígio Veloso, 882-Bodocongó, Campina Grande 58429-900, Paraíba, Brazil.
Polymers (Basel). 2024 Sep 8;16(17):2542. doi: 10.3390/polym16172542.
Styrene-butadiene rubber (SBR) waste from the shoe industry was repurposed to produce polypropylene (PP)-based compounds, with the aim of evaluating their antistatic potential. Styrene-ethylene-propylene (SEP) was added as a compatibilizing agent, while carbon nanotubes (MWCNT) were incorporated as a conductive nanofiller. The polymer compounds were processed in an internal mixer, and injection molded. The properties evaluated included torque rheometry, melt flow index (MFI), impact strength, tensile strength, Shore D hardness, electrical conductivity, heat deflection temperature (HDT), and differential scanning calorimetry (DSC), along with scanning electron microscopy (SEM) for morphology analysis. The production of the PP/SBR/SEP (60/30/10 wt%) compound resulted in a ductile material, enhancing impact strength and elongation at break to 161.2% and 165.2%, respectively, compared to pure PP. The addition of SEP improved the compatibility of the PP/SBR system, leading to an increase in the torque curve and a reduction in the MFI. Furthermore, the SBR/SEP combination in PP accelerated the crystallization process and increased the degree of crystallinity, suggesting a nucleating effect. Carbon nanotubes, in concentrations ranging from 0.5 to 2 phr (parts per hundred resin), were added to the PP/SBR/SEP system. Only the PP/SBR/SEP/MWCNT compound with 2 phr of MWCNT was suitable for antistatic applications, exhibiting an electrical conductivity of 4.52 × 10 S/cm. This was due to the greater distribution of MWCNT in the PP matrix, as demonstrated by SEM. In addition, remains tough at room temperature, with a 166% increase in impact strength compared to PP. However, there was a reduction in elastic modulus, tensile strength, Shore D hardness, and HDT due to increased flexibility. SBR waste can be reintegrated into the production chain to produce antistatic polymeric compounds, obtaining a tough material at room temperature.
鞋类行业产生的丁苯橡胶（SBR）废料被重新利用，用于生产聚丙烯（PP）基复合材料，目的是评估其抗静电潜力。添加苯乙烯 - 乙烯 - 丙烯（SEP）作为增容剂，同时加入碳纳米管（MWCNT）作为导电纳米填料。聚合物复合材料在密炼机中加工并注塑成型。评估的性能包括转矩流变学、熔体流动指数（MFI）、冲击强度、拉伸强度、邵氏D硬度、电导率、热变形温度（HDT）和差示扫描量热法（DSC），以及用于形态分析的扫描电子显微镜（SEM）。PP/SBR/SEP（60/30/10重量%）复合材料的生产得到了一种韧性材料，与纯PP相比，冲击强度和断裂伸长率分别提高到161.2%和165.2%。SEP的添加改善了PP/SBR体系的相容性，导致转矩曲线增加和MFI降低。此外，PP中的SBR/SEP组合加速了结晶过程并提高了结晶度，表明具有成核作用。将浓度范围为0.5至2 phr（每百份树脂份数）的碳纳米管添加到PP/SBR/SEP体系中。只有含有2 phr MWCNT的PP/SBR/SEP/MWCNT复合材料适用于抗静电应用，其电导率为4.52×10 S/cm。如SEM所示，这是由于MWCNT在PP基体中的分布更均匀。此外，在室温下仍保持坚韧，与PP相比冲击强度提高了166%。然而，由于柔韧性增加，弹性模量、拉伸强度、邵氏D硬度和HDT有所降低。SBR废料可以重新融入生产链，以生产抗静电聚合物复合材料，在室温下获得一种坚韧的材料。
