Study On Preparation And Properties Of NR/OMMT Nanocomposite

Organic-modified montmorillonite (OMMT) is prepared by intercalating with CTAB, and its structure is tested by X-ray diffraction (XRD), thermalgravimetric analysis (TGA) and FT-IR. The dispersion of OMMT in water is measured with particle size analyzer. Based on the dispersion results, the optimal dosage of NF is finalized.The results show that the optimal compounding ratio for MMT organic modifying CTAB/OMMT = 3/7, and the XRD results show that the inter-laminar space of OMMT increase from 1.5 nm to 3.8 nm. The dispersing agent (NF) can improve the solubility of OMMT.Natural rubber/OMMT (NR/OMMT) nanocomposites are prepared by grafting and intercalating in latex with methyl methacrylate(MMA) monomer. The properties and structures of resulting nanocomposites are investigated with XRD, TGA and transmission electron microscopy (TEM). The storage stability of latex nanocomposite is also studied.The thermal resistance and dynamic mechanical properties of NR/OMMT nanocomposites are investigated with TGA and dynamic mechanical analysis (DMA), respectively. The results show that the thermal resistance of NR/OMMT is much better than that of the pure NR, storage modules(E') of NR/OMMT nanocomposite is lower than that of pure NR, while loss angle tanδis higher than that of NR. The storage stability of nanocomposite is poorer than that of the pure natural rubber latex (NRL).The structure and the dynamic rheology property of NR/OMMT nanocomposite are studied with TEM and RPA2000. It is found that the NR/OMMT nanocomposites possess good intercalation structures. In the process of frequency sweep, E' of NR/OMMT nanocomposite increases with the increase of frequency, while tanδdecreases with the increase of frequency. E' of NR/OMMT nanocomposite is lower than that of the pure NR, while tanδof NR/OMMT nanocomposite is higher than that of NR. As for strain sweep, the changing of E' and tanδwith strain is similar to the situation of frequency sweep. For temperature sweep model, tanδof NR/OMMT nanocomposites decrease with the increase of temperature, during the whole sweep process, tanδof NR/OMMT nanocomposite is higher than that of NR.