Wang Guofeng, Yu Wenwen, Zhang Sitong, Yang Kaijie, Liu Wenying, Wang Jiaqi, Liu Fuyong
College of Materials Science & Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
Materials (Basel). 2023 Aug 30;16(17):5947. doi: 10.3390/ma16175947.
To improve heat dissipation capability and enhance mechanical properties, a series of silica aerogel (SA) and modified glass fiber (GF)-filled SBR composites were prepared. It was found that the addition of SA successfully reduced the thermal conductivity of SBR by 35%, owing to the heat shield of the nanoscale porous structure of SA. Moreover, the addition of modified glass fiber (MGF) yielded a significant increase in the tensile and tear strength of SBR/SA composite rubber of 37% and 15%, respectively. This enhancement was more pronounced than the improvement observed with unmodified GF, and was attributed to the improved dispersion of fillers and crosslinking density of the SBR matrix. Rheological analysis revealed that the addition of SA and MGF weakened the dependence. This was due to the partial relaxation of immobilized rubber chains and limited relaxation of rubber chains adsorbed on the MGF. Furthermore, the strain amplification effect of MGF was stronger than that of GF, leading to a more pronounced reinforcing effect.
为了提高散热能力并增强机械性能，制备了一系列二氧化硅气凝胶（SA）和改性玻璃纤维（GF）填充的丁苯橡胶（SBR）复合材料。研究发现，由于SA纳米级多孔结构的隔热作用，SA的添加成功使SBR的热导率降低了35%。此外，添加改性玻璃纤维（MGF）使SBR/SA复合橡胶的拉伸强度和撕裂强度分别显著提高了37%和15%。这种增强效果比未改性GF的情况更为明显，这归因于填料分散性的改善和SBR基体交联密度的提高。流变学分析表明，SA和MGF的添加减弱了依赖性。这是由于固定化橡胶链的部分松弛以及吸附在MGF上的橡胶链的有限松弛。此外，MGF的应变放大效应比GF更强，导致增强效果更显著。
