碳纳米管束与炭黑并用对天然橡胶加工性能和静态力学性能的影响

研究了不同长径比的多壁阵列碳纳米管束（carbon nanotube bundles,CNTBs）非等量替代炭黑N234并用的填料增强体系对天然橡胶加工性能和静态力学性能的影响,结果表明,随着CNTBs长径比的增大和用量的提高,天然橡胶纳米复合材料的加工性能变差,硫化速率下降,而硫化返原现象减轻,加工安全性得到改善;随着CNTBs长径比的增大和用量的提高,材料的静态力学性能逐渐提高,出现纳米增强效应。通过Mooney Rivlin模型分析材料的应变诱导结晶情况,推测得到CNTBs长径比与应变诱导结晶起始点的关系;材料的抗撕裂性能改善比较明显,主要原因是CNTBs较高的比表面积使其与橡胶分子产生了较多的界面。

Effect of carbon nanotube bundles and carbon black on the processing and static mechanical properties of natural rubber

The effects of non-equal replacement of carbon black (N234) by multi-wall array carbon nanotube bundles (CNTBs) with different aspect ratios on the processing properties and static mechanical properties of natural rubber nanocomposites have been studied. It was found that as the aspect ratio and the amount of CNTBs increased, the processing properties of the nanocomposites deteriorated, and the vulcanization rate decreased. However, the phenomenon of reversion was reduced and processing safety improved. The static mechanical properties of the material were gradually improved as nano-enhancement effects appeared. The material strain was analyzed by using the Mooney Rivlin model, and the relationship between the aspect ratio of CNTBs and the strain-induced crystallization starting point was identified. In addition, the tear strength of the material was improved significantly, which is mainly due to the high specific surface area of CNTBs.