Estudo das propriedades elétricas e térmicas de compósitos nanoestruturados de poli(sulfeto de fenileno) reforçados com nanotubos de carbono

Abstract

ResumoNeste trabalho o comportamento de cristalização e a condutividade elétrica de compósitos nanoestruturados de poli(sulfeto de fenileno) reforçado com nanotubos de carbono de paredes múltiplas obtidos através da técnica de mistura em fusão foram estudados. A incorporação do nanoreforço na matriz polimérica foi responsável por um aumento da cristalinidade devido ao fenômeno de nucleação heterogênea. A condutividade elétrica do PPS apresentou um aumento de 11 ordens de magnitude quando 2,0 m/m% de MWCNT foram adicionados a matriz polimérica. Além disso, o limite de percolação elétrica encontrado para este sistema foi de 1,4 m/m% de MWCNT, revelando a formação de uma rede condutiva tridimensional no interior da matriz polimérica. Palavras-chave: PPS, MWCNT, cristalização, propriedades elétricas, limite de percolação elétrica. AbstractIn this work, the crystallization behavior and electrical conductivity of multiwalled carbon nanotubes reinforced poly (phenylene sulfide) nanostructured composites obtained by melt mixing were investigated. The incorporation of nanofiller in polymeric matrix was responsible for an increase in crystallinity due heterogeneous nucleation phenomenon. The electrical conductivity of PPS showed an increase by 11 orders of magnitude when 2.0 wt% of MWCNT was considered. Moreover, the electrical percolation threshold found on this system was 1.4 wt%, suggesting the formation of three-dimensional conductive network within the polymeric matrix.

Polymer Nanocomposites with Different Types of Nanofiller

“…When the concentration of the nanofiller reaches a critical value, known as the limit of electrical percolation, the electrical conductivity of the nanocomposite increases unexpectedly. After this abrupt increase in electrical conductivity, it will show modest increases as the conductive additive increases inside the polymer matrix [18,22]. In nanocomposites based on polymer blends, the amount of CNTs required to achieve electrical percolation may be even lower than in nanocomposites with a single polymer matrix, provided that a selective location of the CNTs occurs in the matrix phase or at the interface of the blend [18,23].…”

Evaluation of the dispersion of carbon nanotubes in an elastomeric polyurethane and fatigue test

“…The extraordinary properties of carbon nanotubes (CNT) [1][2][3] have motivated large efforts to apply them as reinforcing agents in polymer composites [4,5] . The success, however, is being limited by the difficulties to disperse the nanomaterial and promote a good interaction with polymer chains at the interfaces.…”

Carbon nanotube buckypaper reinforced polymer composites: a review

“…Materials with electrical conductivities higher than 10 -8 S/cm are required for electrostatic dissipation, while for electrostatic painting and EMI shielding applications, conductivities greater than 10 -6 to 10 -1 S/cm, respectively are required [76][77][78] . The measured electrical conductivities of traditional CNT/polymer composites typically ranged from 10 -5 to 10 -3 S/cm above the percolation threshold [76][77][78][79][80][81][82] . The incorporation of CNTs within a polymer is responsible for creating a CNT network, which allows a transition behavior from a semi-conductive or conductive material.…”