Bekin Açar Seda, Taşdelen Mehmet Atilla, Karaağaç Bağdagül
Department of Polymer Materials Engineering, Faculty of Engineering, Yalova University, Yalova, Turkey.
Department of Chemical Engineering, Faculty of Engineering, Kocaeli University, Kocaeli, Turkey.
Turk J Chem. 2023 Feb 7;47(2):417-425. doi: 10.55730/1300-0527.3548. eCollection 2023.
The effect of octaisobutyl-polyhedral oligomeric silsesquioxane (OIB-POSS) as a nanosized reinforcement on the cure kinetics, crosslinking density, and mechanical properties of styrene-butadiene rubber (SBR) nanocomposites was examined in this study. For this purpose, SBR compounds with various OIB-POSS nanoparticle loadings at 1, 3, and 5 phr were prepared and their results were compared with a reference compound without OIB-POSS. When 1 phr of OIB-POSS was added to the rubber matrix, the elongation at break values and tensile strength of the corresponding nanocomposite increased by 24.1% and 29.2% compared to the reference sample, respectively. The presence of OIB-POSS nanoparticles and their random distribution in the SBR matrix was confirmed by transmission electron microscopy. The crosslinking density of nanocomposites was calculated by the Flory-Rehner method and a decrease was observed with the addition of OIB-POSS nanoparticles. In addition, thermal aging process as 70 °C for 70 h was applied to vulcanized samples. It was noted that the mechanical properties of SBR/OIB-POSS nanocomposites remarkably improved, whereas their crosslinking densities gradually decreased after thermal aging.
本研究考察了八异丁基-多面体低聚倍半硅氧烷（OIB-POSS）作为纳米增强剂对丁苯橡胶（SBR）纳米复合材料的硫化动力学、交联密度和力学性能的影响。为此，制备了含1、3和5份不同OIB-POSS纳米颗粒负载量的SBR胶料，并将其结果与不含OIB-POSS的参比胶料进行比较。当向橡胶基体中添加1份OIB-POSS时，相应纳米复合材料的断裂伸长率值和拉伸强度相比参比样品分别提高了24.1%和29.2%。通过透射电子显微镜证实了OIB-POSS纳米颗粒的存在及其在SBR基体中的随机分布。采用Flory-Rehner方法计算纳米复合材料的交联密度，发现添加OIB-POSS纳米颗粒后交联密度降低。此外，对硫化样品进行了70℃下70小时的热老化处理。结果表明，SBR/OIB-POSS纳米复合材料的力学性能显著提高，而热老化后其交联密度逐渐降低。
