Abstract:Based on the mechanical properties, crosslinking density, viscoelastic behavior, thermal behavior, dynamic properties of rubber composites, influence of interfacial interaction between stalks nanocellulose(SNC) and natural rubber(NR)reinforced by carbon black(CB) before and after adding phenol-formaldehyde resin(PF) was analyzed by FT-IR, XPS, DSC and DMA, etc. Bonding forms between SNC and NR by PF was concluded in theory. FT-IR analysis shows that absorption peak of hydroxyl (-OH) in modified SNC has the hypsochromic shift, and XPS spectra display that O1s binding energy of modified SNC increases, indicating that the strong hydrogen bonding interaction between SNC and PF exists. Compared to NR/CB/PF composites, NR/CB/SNC/PF system has higher elastic modulus(G′) in large strain, suggesting that it has a stronger rubber crosslinking network. The higher χim value shows a tighter immobilized polymer layer approaching the filler surface of NR/CB/SNC/PF composites, which leads to better dispersion of SNC and the stronger filler-rubber interfacial bonding. With low tanδ, high filler-matrix interaction parameters and high λ-1 values in upoint of large strain, NR/CB/SNC/PF composites show stronger filler-NR interaction. SEM shows that the addition of PF buries more uniform fillers in NR matrix.In conclusion,with the addition of PF, interpenetrating polymer network is formed by CB/SNC fillers and NR martix, the filler-NR interaction’s improvement makes the enhancement of the crosslinking densities, thus the mechanical properties of the NR composites reinforced by CB are kept constant or strengthened with SNC