Rodak Agata, Susik Agnieszka, Kowalkowska-Zedler Daria, Zedler Łukasz, 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 Mar 31;16(7):2807. doi: 10.3390/ma16072807.
In this work, ground tire rubber and styrene-butadiene block copolymer (GTR/SBS) blends at the ratio of 50/50 wt%, with the application of four different SBS copolymer grades (linear and radial) and two types of cross-linking agent (a sulfur-based system and dicumyl peroxide), were prepared by melt compounding. The rheological and cross-linking behavior, physico-mechanical parameters (i.e., tensile properties, abrasion resistance, hardness, swelling degree, and density), thermal stability, and morphology of the prepared materials were characterized. The results showed that the selected SBS copolymers improved the processability of the GTR/SBS blends without any noticeable effects on their cross-linking behavior-which, in turn, was influenced by the type of cross-linking agent used. On the other hand, it was observed that the tensile strength, elongation at break, and abrasion resistance of the GTR/SBS blends cured with the sulfur system (6.1-8.4 MPa, 184-283%, and 235-303 mm, respectively) were better than those cross-linked by dicumyl peroxide (4.0-7.8 MPa, 80-165%, and 351-414 mm, respectively). Furthermore, it was found that the SBS copolymers improved the thermal stability of GTR, while the increasing viscosity of the used SBS copolymer also enhanced the interfacial adhesion between the GTR and SBS copolymers, as confirmed by microstructure evaluation.
在本研究中，通过熔融共混制备了质量比为50/50的地面轮胎橡胶与苯乙烯-丁二烯嵌段共聚物（GTR/SBS）共混物，其中应用了四种不同等级的SBS共聚物（线性和径向）以及两种交联剂（硫基体系和过氧化二异丙苯）。对所制备材料的流变和交联行为、物理力学参数（即拉伸性能、耐磨性、硬度、溶胀度和密度）、热稳定性以及形态进行了表征。结果表明，所选的SBS共聚物改善了GTR/SBS共混物的加工性能，且对其交联行为没有任何显著影响，而交联行为又受所用交联剂类型的影响。另一方面，观察到用硫体系固化的GTR/SBS共混物的拉伸强度、断裂伸长率和耐磨性（分别为6.1 - 8.4 MPa、184 - 283%和235 - 303 mm）优于用过氧化二异丙苯交联的共混物（分别为4.0 - 7.8 MPa、80 - 165%和351 - 414 mm）。此外，发现SBS共聚物提高了GTR的热稳定性，同时所用SBS共聚物粘度的增加也增强了GTR与SBS共聚物之间的界面粘附力，微观结构评估证实了这一点。
