改性白炭黑与炭黑协同增强天然橡胶复合材料

Modified White Carbon Black and Carbon Black Synergistically Enhance Natural Rubber Composite

为了改善填料的分散性,采用离子液体1-烯丙基-3-甲基氯化咪唑(AMI)改性白炭黑(SiO2),并制备改性白炭黑/炭黑/天然橡胶复合材料,通过傅里叶红外光谱(FT-IR),扫描电镜(SEM),动态力学分析仪(DMA),热失重分析仪(TGA)等分析方法,研究AMI改性对白炭黑/炭黑/天然橡胶复合材料微观结构、力学性能、动态力学性能的影响。结果表明:经AMI改性后,白炭黑粒子间的相互作用减小,团聚倾向减弱,且与炭黑并用后在橡胶复合材料基体中的分散性改善,弥散效应和界面作用增强,改性复合材料的硫化反应活化能降低,综合力学性能提高。此外,离子液体用量的提高有助于复合材料分子链有序性的增加,使复合材料的热稳定性增强。可见改性白炭黑与炭黑并用对橡胶有很好的补强效果。

In order to improve the dispersibility of the filler,the ionic liquid 1-allyl-3-methylimidazole(AMI)modified white carbon black(also namely as SiO2)was used.And modified silica/carbon black/natural rubber composite was prepared then.The influence of material microstructure,mechanical properties and dynamic mechanical properties of AMI modified SiO2/CB/NR composite was studied by Fourier transform infrared spectroscopy(FT-IR),scanning electron microscopy(SEM),dynamic mechanical analyzer(DMA),and thermogravimetric analyzer(TGA).The results show that after AMI modification,the interaction between the silica particles is reduced,the tendency of agglomeration is weakened.The dispersibility in the matrix of the rubber composite is improved after the combination with carbon black,and the dispersion effect and interfacial effect are enhanced.The activation energy of the vulcanization reaction of the composite material is reduced,and the comprehensive mechanical properties are improved.In addition,the increase in the amount of ionic liquid contributes to the increase in the order of the molecular chains of the composite and enhances the thermal stability of the composite.The modified white carbon black and carbon black have a good reinforcing effect on the rubber.