Abstract

Nanocomposites are nanometrical material particles embedded in a specific matrix. The degree of organization of the nanostructures and their properties depend on the nature of the organic and inorganic components of the structure that can generate synergic interactions. Polymeric nanocomposites are related to a class of hybrid materials where inorganic substances of nanometric dimensions are dispersed in a polymeric matrix. In the present work, nanocomposites of nylon 6,12 with different concentrations of pseudoboehmite obtained by sol-gel process were prepared with and without the presence of octadecylamine. After preparation, the samples were irradiated with a 200 kGy radiation dose in an electron accelerator. The pseudoboehmite nano particles were characterized by X-ray diffraction, scanning electron microscopy, differential thermal analysis and thermo gravimetric analysis. The nanocomposites were characterized by thermal and mechanical tests. The addition of pseudoboehmite promoted a reduction of the melting flow during the production of the composites evidencing the interaction of pseudoboehmite with the polymeric matrix, probably modifying its crystalline structure.

Highlights

  • All the hybrid organic-inorganic composites generally exhibit mechanical properties superior to those of their pure components [1]

  • In this work was prepared a nanocomposite of nylon 6,12 and a fine ceramic material, namely pseudoboehmite modified with octadecylamine

  • The typical curve of the differential scanning calorimetry (DSC) for pseudoboehmite shows an endothermic peak near the temperature of 100o C, due to water vaporization

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Summary

Introduction

All the hybrid organic-inorganic composites generally exhibit mechanical properties superior to those of their pure components [1]. The production and development of new nanocomposite materials has been increasing for almost all areas studied by material science, due to the possibility to modify properties like mechanical behavior, chemical, electrical and thermal stability. With the purpose to optimize the performance properties of the organic-inorganic composites, it is usually desirable to disperse the inorganic components in the organic matrix on a nanometer length scale. One successful process to achieving nanoparticles is the sol-gel process [2,3]. In this work was prepared a nanocomposite of nylon 6,12 and a fine ceramic material, namely pseudoboehmite modified with octadecylamine. Pseudoboehmite is based on a monohydroxide aluminum oxide produced from the sol-gel synthetic route using ammonium hydroxide and aluminum nitrate as precursors. The octadecylamine is used like an organomodifier agent in organopseudoboehmite production

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