Obtenção de nanocompósitos condutores de montmorilonita/polipirrol: Efeito da incorporação do surfactante na estrutura e propriedades

Sílvia Daniela Araújo Da Silva Ramôa,Claudia Merlini,Guilherme Mariz De Oliveira Barra,Bluma Guenther Soares

doi:10.4322/polimeros.2014.051

Sílvia Daniela Araújo Da Silva Ramôa, Claudia Merlini + Show 2 more

Open Access

https://doi.org/10.4322/polimeros.2014.051

Copy DOI

Abstract

Nanocompositos de montmorilonita/polipirrol (MMT/PPy) foram preparados a partir da polimerizacao in situ do pirrol na presenca de argila, bentonita sodica natural, (MMT-Na+) em solucao aquosa com ou sem surfactante anionico, dodecil sulfato de sodio (SDS), utilizando-se o cloreto de ferro (III) hexahidratado (FeCl3.6H2O), como oxidante. A estrutura e propriedades dos nanocompositos obtidos pela polimerizacao in situ do pirrol na presenca de SDS (MMT/PPy.SDS) e sem surfactante (MMT/PPy) foram avaliadas e comparadas a partir da espectroscopia de infravermelho com transformada de Fourier (FTIR), difracao de raios X (DRX), microscopia eletronica de varredura (MEV), microscopia eletronica de transmissao (MET), analise termogravimetrica (TG) e metodo padrao quatro pontas. Os difratogramas dos nanocompositos revelaram que o espacamento basal d001 da MMT (1,42 nm) foi alterado para valores maiores, indicando a intercalacao do PPy na MMT para ambos os nanocompositos obtidos. Os difratogramas e as imagens de MET e MEV dos nanocompositos de MMT/PPy.SDS confirmaram que a presenca do SDS na reacao promoveu, alem da intercalacao, esfoliacao parcial da argila. Os nanocompositos MMT/PPy.SDS apresentaram condutividade eletrica (9,50 S/cm) maior do que o nanocomposito de MMT/PPy (4,44 S/cm). A presenca da argila melhorou de forma significativa a estabilidade termica do PPy.

Highlights

Nanotechnology has been widely studied to develop in situ polymerization using a metallocene catalyst methods to enhance the properties and find new based on zirconium
The image of CAT-CNT showed that carbon nanotubes were involved by the catalytic system, which would allow the polymer during its synthesis to grow in between the meshes of the CNT, providing the disentanglement of carbon nanotubes
CNT was successfully immobilized on ZieglerNatta catalysts based on titanium species supported on magnesium chloride, which enabled the preparation of PP/CNT nanocomposites with different percentages of nanofiller by the in situ polymerization technique

Summary

Introduction

Nanotechnology has been widely studied to develop in situ polymerization using a metallocene catalyst methods to enhance the properties and find new based on zirconium. Materials with superior them to the cocatalyst methylaluminoxane, and after resistance in relation to conventional composites can be polymerization, the formation of materials with fillers prepared by combining a soft polymer matrix with rigid well dispersed throughout PP matrix could be observed. CNTs have been widely used as reinforcement polymerization, the monomer is polymerized in the to produce polymer materials with interesting and presence of a nanofiller, which provides better contact novel properties[5,6]. These have a structure similar to between the polymer and the dispersed phase[11]. In situ a graphene sheet rolled into a transparent cylinder and polymerization allows the mixing of nanofillers in the can be classified as single-walled or multi-walled carbon polymer matrix during the birth of the polymer,

Objectives

Methods

Results

Conclusion