Efeito Payne em nanocompósitos de NBR com montmorilonita organofílica

Abstract

Resumo: Neste trabalho foi estudado o efeito Payne como uma medida das interações carga-carga e polímero-carga em nanocompósitos de montmorilonitaorganofílica (MMTorg) e borracha nitrílica (NBR), usando o Analisador de Processamento de Borracha -RPA 2000. Os nanocompósitos de NBR e MMTorg foram preparados em um misturador de rolos e o efeito Payne foi avaliado em compostos não vulcanizados tipo goma pura e contendo 5, 10, 15 e 20 phr de MMTorg. Os resultados mostraram que a composição com 5phr de MMTorg apresentou melhor interação polímero-carga como consequência da menor quantidade de aglomerados de carga na matriz elastomérica. Palavras-chave: Nanocompósito, montmorilonita organofílica, efeito Payne, borracha nitrílica, RPA 2000. Payne Effect in NBR Nanocomposites with Organofilic MontmorilloniteAbstract: In this work the Payne effect was evaluated as a measure of the filler-filler and filler-polymer interactions in nanocomposites of organomontmorillonite (MMTorg) on acrylonitrile-butadiene-rubber (NBR) by using the Rubber Process Analyzer -RPA 2000. The nanocomposites of NBR and MMTorg were prepared on a Berstorff two-roll mill and the evaluation of the Payne effect was carried out in unvulcanized pure gum and varying the MMTorg content from 5, 10, 15 and 20 phr. The composition with 5 phr of MMTorg showed the best filler-polymer interaction as a consequence of the smaller amount of agglomerates of the filler in the elastomeric matrix.

Rheological properties and curing features of natural rubber compositions filled with fluoromica ME 100

“…It can be observed that for both properties studied, complex viscosity and minimum torque, there is increasing growth as a function of the filler content, potentialized for the 7 phr composition, meaning higher rubber-filler interaction. Beyond this formulation, that is, for 10 phr mica the viscosity increase is lower, 7 phr being possibly an indication of the filler limit content in the composition meaning better dispersion and distribution within the elastomeric matrix [23][24][25][26][27] .…”

“…The polymer-filler and filler-filler interactions were estimated based on the Payne Effect [23][24][25][26][27][28][29] .…”

“…Such interactions have been studied by Payne (Payne Effect) through the influence of strain amplitude on elastic modulus. The Payne Effect can be calculated by the difference between the elastic moduli before and after cure, with a specific value of strain (∆G' = G' 0 -G' ∞ ) while temperature and frequency are kept constant [23][24][25][26][27][28][29] .…”

Mixing process influence on thermal and rheological properties of NBR/SiO2 from rice husk ash

“…Measurement of the modulus decrease with increasing strain amplitude by dynamic mechanical testing is commonly used to investigate the reinforcing mechanism occurring in filled rubber compounds [19][20][21] . Figure 3 shows the storage shear modulus (G') versus the strain amplitude for the co-coagulation and spray-drying experiments.…”

“…About hydrodynamic effect, the increase in modulus results from the fact that fillers form a rigid phase that cannot be deformed. As for the filler-filler interaction, known as the Payne effect, it is characterized by a modulus decrease at low strain caused by the breakdown of filler inter-aggregates [18][19][20] . For silica filled NBR compounds, it is commonly understood that filler-filler networking takes place easily due to the polarity differences between polymer and silica.…”