In this work, a thiol-ene click reaction was used to graft polystyrene (PS) chains onto the surface of ethylene propylene diene monomer-based ground tire rubber (GTR). A thiol-terminated PS (11 kg mol⁻¹) was selected, due to its commercial availability, to modify a postconsumer GTR. The resulting PS-grafted GTR (GTR-g-PS) particles were analyzed via Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) to detect surface changes on treated samples. An increase in aliphatic and aromatic carbon atoms was observed by FTIR and XPS, while grafted material was observed by SEM on the GTR surface, confirming that grafting took place. Then, composites were prepared from these GTR-g-PS particles and from PS by solution evaporation, at 50 wt%. A significant increase in tensile (20%) and storage moduli (from 80% at 65°C to 510% at 95°C) was observed by dynamic mechanical thermal analysis when compared to composites prepared with untreated GTR. In addition, GTR samples showed improved thermal resistance, as attested by the shift in degradation temperature for 10% mass loss (from 400°C for GTR to 450°C for GTR-g-PS). This increases the possible range of processing temperature and service temperature (applications) for introduction of GTR in other polymer matrices.

在这项工作中，使用硫醇-烯点击反应将聚苯乙烯（PS）链接枝到基于乙丙二烯单体的地面轮胎橡胶（GTR）的表面上。由于其商业可获得性，选择了硫醇封端的PS（11 kg mol ^-1）来修饰消费后的GTR。通过傅立叶变换红外光谱（FTIR），扫描电子显微镜（SEM）和X射线光电子能谱（XPS）分析得到的PS接枝的GTR（GTR- g -PS）颗粒，以检测处理后样品的表面变化。通过FTIR和XPS观察到脂族和芳族碳原子的增加，而通过GTR表面上的SEM观察到接枝的材料，证实了接枝的发生。然后，由这些GTR- g制备复合材料-PS颗粒，并通过溶液蒸发从PS中分离出50 wt％。与未经处理的GTR制备的复合材料相比，通过动态机械热分析观察到拉伸强度（20％）和储能模量显着增加（从65°C的80％增至95°C的510％）。此外，GTR样品显示出改善的耐热性，这是通过降解10％质量损失的温度变化（从GTR的400°C到GTR- g -PS的450°C ）证明的。这增加了将GTR引入其他聚合物基质中的处理温度和使用温度（应用）的可能范围。