Study of the thermomechanical and electrical properties of conducting composites containing natural rubber and carbon black

Abstract

This work describes the preparation and characterization of composite materials obtained by the combination of natural rubber (NR) and carbon black (CB) in different percentages, aiming to improve their mechanical properties, processability, and electrical conductivity, aiming future applications as transducer in pressure sensors. The composites NR/CB were characterized through optical microscopy (OM), DC conductivity, thermal analysis using differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMA), thermogravimetry (TGA), and stress-strain test. The electrical conductivity varied between 10 29 and 10 S m 21, depending on the percentage of CB in the composite. Furthermore, a linear (and reversible) dependence of the conductivity on the applied pressure between 0 and 1.6 MPa was observed for the sample with containing 80 wt % of NR and 20% of CB.

Sugarcane bagasse ash: new filler to natural rubber composite

“…In general, rubbers are benefited by vulcanization processes which consist of the crosslink of the polymer chains improving mainly the mechanical properties of the compound [8,9] . Currently, the rubber has been of great interest of study as result of the possibility of composites preparation as a new approach to technology development [10,11] which may contain organic compounds such Defatted Soy Flour [12] , or carbon black [13,14] as both reinforce and conductive agents.…”

Flexible Antennas Based on Natural Rubber

“…The fact that the addition of filler increases tan δ implies that the material becomes more lossy thus leading to an increase in the electrical conductivity, in confirmation with [12]. Furthermore, the addition of carbon up to 20% weight can give a nine-order of magnitude increase in conductivity, ranging from 10 −9 to 10 S/m [9]. Based on previous studies [8], a certain relaxation time is necessary since the polarization caused by the orientation of the dipoles cannot keep up with the fluctuating electrical strength.…”

“…There have been several reports on rubber previously but mostly have only focused on their dielectric [6][7][8] and thermo-mechanical [9] properties. There was an attempt to build antennas using EPDM rubber previously [10], but EPDM is synthetic rubber.…”

Borracha natural e nanocompósitos com argila

“…33,34 O grupo de Luis H. C. Mattoso da Embrapa/Instrumentação Agropecuária se dedica à pesquisa de materiais compósitos e nanocompósitos de borracha natural e com outros polímeros condutores como, por exemplo, o desenvolvimento de filmes condutores de eletricidade de borracha natural com negro de fumo com potencial aplicação como transdutores em sensores de pressão. 35 O grupo de Fernando Galembeck desenvolveu um método inovador de preparação de nanocompósitos a partir de látices e dispersões aquosas com nanopartículas de argilas por mistura mecanoquímica. O desenvolvimento de tecnologias para preparação de nanocompósitos de borracha natural com argilas já é corrente neste laboratório.…”