Structure And Properties Of Rubber / Montmorillonite Nanocomposites

In this research,several rubber/OMMT nanocomposites have been prepared by emulsion intercalation and solution intercalation method.Organic montmorillonite were prepared in our lab.The preparation technology and the relationship between micro-structure and property of nanocomposites have been studied.SBR/OMMT nanocomposites were prepared by emulsion intercalation method,and SBR/NR/OMMT nanocomposites were prepared firstly.The results of TEM and XRD showed that the OMMT layers were intercalated into the rubber chains.The mechanical properties,thermal stability,oil resistance and dynamic mechanical analysis of nanocomposites were studied,and a comparison between nanocomposites and other fillers reinforced rubber was made.The results showed that the mechanical properties of nanocomposites improved with the increased of OMMT content when the OMMT content is lower.The DMTA analysis showed that the SBR/OMMT nanocomposites had a good roiling resistance,the nanocomposites had excellent dynamic mechanical properties.The BR/OMMT and BR/NR/OMMT nanocomposites were prepared by solution intercalation method.The results of TEM and XRD showed that the OMMT layers were half-exfoliated in the rubber matrix.According to statistical data,average thickness of layers was 10nm,and the thickness of the biggest layers was less than 40nm,only a few layers were exfoliated in monolayer whose thickness was about 1nm.When the OMMT content is 6wt%,the tensile strength of BR/OMMT nanocomposites was 5.7MPa compared to BR 1.4Mpa,When the OMMT content is small,the abrasion properties of SBR and BR nanocomposites can be improved.When the OMMT content increased to a certain value, the re-aggregation of OMMT has a negative effect on the nanocomposites.Due to the OMMT layer has excellent barrier properties,the nanocomposites have excellent thermal stabilities and oil resistance.