Susik Agnieszka, Rodak Agata, Cañavate Javier, Colom Xavier, Wang Shifeng, Formela Krzysztof
Department of Polymer Technology, Faculty of Chemistry, Gdańsk University of Technology, Gabriela Narutowicza 11/12, 80-233 Gdańsk, Poland.
Advanced Materials Center, Gdańsk University of Technology, Gabriela Narutowicza 11/12, 80-233 Gdańsk, Poland.
Materials (Basel). 2023 Feb 22;16(5):1788. doi: 10.3390/ma16051788.
In this work, ground tire rubber (GTR) was thermo-mechanically treated in the presence of styrene-butadiene-styrene (SBS) copolymers. During preliminary investigation, the effects of different SBS copolymer grades, the variable content of SBS copolymer on the Mooney viscosity, and the thermal and mechanical properties of modified GTR were determined. Subsequently, GTR modified by SBS copolymer and cross-linking agents (sulfur-based system and dicumyl peroxide) was characterized by assessment of rheological, physico-mechanical, and morphological properties. Rheological investigations showed that linear SBS copolymer, with the highest melt flow rate among studied SBS grades, was the most promising modifier of GTR, considering processing behavior. It was also observed that an SBS improves the thermal stability of the modified GTR. However, it was found that higher content of SBS copolymer (above 30 wt%) does not bring any effective changes and, for economic reasons, is inefficient. The results showed that samples based on GTR modified by SBS and dicumyl peroxide have better processability and slightly higher mechanical properties compared to samples cross-linked by a sulfur-based system. This is due to the affinity of dicumyl peroxide to the co-cross-linking of GTR and SBS phases.
在本研究中，将磨碎轮胎橡胶（GTR）在苯乙烯-丁二烯-苯乙烯（SBS）共聚物存在下进行热机械处理。在初步研究期间，测定了不同SBS共聚物牌号、SBS共聚物含量变化对门尼粘度的影响，以及改性GTR的热性能和力学性能。随后，通过对流变学、物理力学和形态学性能的评估，对经SBS共聚物和交联剂（硫磺基体系和过氧化二异丙苯）改性的GTR进行了表征。流变学研究表明，在所研究的SBS牌号中熔体流动速率最高的线性SBS共聚物，从加工性能考虑是最有前途的GTR改性剂。还观察到SBS提高了改性GTR的热稳定性。然而，发现较高含量的SBS共聚物（高于30 wt%）不会带来任何有效变化，并且出于经济原因是低效的。结果表明，与通过硫磺基体系交联的样品相比，基于经SBS和过氧化二异丙苯改性的GTR的样品具有更好的加工性能和略高的力学性能。这是由于过氧化二异丙苯对GTR和SBS相的共交联具有亲和力。
