Hybrid silica-graphene oxide (SiO₂@GO) nanocomposites were fabricated by sol-gel method using tetraethylorthosilicate (TEOS) as silica (SiO₂) precursor. The prepared nanocomposites were characterized by various analytical techniques to prove that the SiO₂ were completely incorporated on the GO surface. Then, the SiO₂@GO nanocomposites were introduced into natural rubber (NR) matrix followed by conventional vulcanization process, performed by two-roll mill, to obtain NR/SiO₂@GO vulcanizate. The results showed that the presence of SiO₂ nanoparticles on the GO surface improved the distribution of GO in NR matrix, resulting in the increase in modulus and hardness. For comparison with neat NR, NR/SiO₂, and NR/GO, the network parameters of vulcanizates were evaluated using swelling test and tube model theory contributed in stress-strain measurement. These exhibited that the SiO₂@GO induced the chemical crosslink between NR chains, leading to the increment in crosslink density. It was because the well dispersion of SiO₂@GO in NR matrix improved the volume fraction of rubber. Moreover, dynamic mechanical analysis was employed to determine the viscoelasticity behavior of the vulcanizates. The results showed that the presence of SiO₂@GO in NR vulcanizate improved the storage modulus in all temperature range. That meant the elasticity of the vulcanizates was improved by the reduction of the viscous phase to stiff phase ratio of the material. However, the reinforcement of NR using SiO₂@GO as filler was effective in lower deformation reflected from higher modulus at low strain. In addition, the modulus decreased in comparison with that of the neat NR under higher deformation until at break point. Thus, the tensile strength decreased while elongation at break increased. This phenomenon might be explained that the strain-induced crystallization of NR occurred under higher strain was reduced because the rubber chains alignment which was obstructed by the filler penetration and high number of chemical crosslinks. Therefore, the covalent hybrid SiO₂@GO nanocomposites had potential for use as filler in engineering rubber composites that were suitable for the compressive or abrasive applications.

以原硅酸四乙酯（TEOS）为二氧化硅（SiO ₂）前驱体，通过溶胶-凝胶法制备了杂化二氧化硅-氧化石墨烯（SiO ₂ @GO）纳米复合材料。通过各种分析技术对制备的纳米复合材料进行表征，以证明SiO ₂完全掺入了GO表面。然后，将SiO ₂ @GO纳米复合材料引入天然橡胶（NR）基体中，然后通过常规的硫化工艺，通过两辊磨进行，以获得NR / SiO ₂ @GO硫化橡胶。结果表明存在SiO ₂GO表面的纳米颗粒改善了GO在NR基质中的分布，导致模量和硬度增加。为了与纯净NR，NR / SiO ₂和NR / GO进行比较，使用溶胀测试评估了硫化橡胶的网络参数，并且管模型理论有助于应力应变测量。这些表明SiO ₂ @GO诱导了NR链之间的化学交联，导致交联密度增加。这是因为SiO ₂ @GO在NR基体中的良好分散提高了橡胶的体积分数。此外，采用动态力学分析来确定硫化橡胶的粘弹性行为。结果表明存在SiO ₂NR硫化橡胶中的@GO改善了在所有温度范围内的储能模量。这意味着通过降低材料的粘性相与刚性相之比，可以提高硫化橡胶的弹性。但是，使用SiO ₂增强NR在低应变下，@ GO作为填料可有效降低因较高模量而引起的变形。另外，与纯NR相比，在较高变形下直至断裂点，模量降低。因此，抗张强度降低，而断裂伸长率增加。这种现象可以解释为，由于较高的化学交联次数和填充剂的渗透阻碍了橡胶链的排列，降低了在较高应变下发生的NR的应变诱导结晶。因此，共价杂化SiO ₂ @GO纳米复合材料有潜力在工程橡胶复合材料中用作填料，适用于压缩或磨料应用。