Mechanical and electrical properties of a polyester resin reinforced with clay-based fillers

Abstract

In this study, composite polymer-based materials, in which a significant proportion of polyester resin has been substituted by low cost and environmentally friendly clay-based raw materials, have been elaborated. The main objective is to improve mechanical properties keeping a reasonable electrical insulating behavior. A homogenized distribution of fillers within the matrix compatible with the processing parameters has been obtained up to a maximum added fraction of 20vol%. Mechanical characterizations performed with uniaxial traction tests and Charpy impact pendulum machine have shown that stress to rupture can be enhanced of about 25% and that fracture energy value has double for the best formulations. Dielectric constant decreases and loss factor slightly increases while electrical resistivity remains almost invariable. From a general point of view, composite materials with metakaolin fillers exhibit higher mechanical properties and a greater electrical insulating behavior. Microstructural observations revealed the presence of decohesive agglomerates of particles at the interface with the matrix. Finally, mechanical properties are more sensitive to the homogeneity of fillers dispersion in the matrix than electrical properties.

Combined EBSD and Computer-Assisted Quantitative Analysis of the Impact of Spark Plasma Sintering Parameters on the Structure of Porous Materials

“…However, it should not be considered as a real physical parameter related to the thermal properties because we study the two-dimensional case which generally excludes the comparison with experimental data. [44] Figure 21 presents the summary of the effective thermal conductivity obtained from EBSD maps as a function of the relative density. The results display the linear dependence of k 2D eff and d rel , which qualitatively agrees with most popular theoretical models (Maxwell-Eucken, Landauer) [46,51] and numerical FEM results [10] related to the thermal conductivity of porous materials.…”

Investigation of Dielectric Properties of Polyethylene-Clay Nanocomposites for Quantifying Nanofiller Dispersion

“…Very low amounts of clay or metal oxides doped into polymer matrix are instrumental in increasing the mechanical strength of polymer structures, retarding combustion properties, keeping polymer structures intact up to high temperatures, reducing gas permeability properties, inhibiting the absorption of inorganic liquids, increasing dielectric strengths and developing polymers with lower dielectric constant. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] The aim of this study is to examine in detail the dielectric properties of polymer-clay mixtures. Dielectric studies that investigate molecular drift in polypropylene-clay nanocomposites (Martin et al), 2 polarization mechanism of polymeric composite obtained by mixing polypropylene and synthetic clay and electrical conductivity (Antonio et al), 3 dielectric properties of thin film structures prepared according to clay concentration in poly-clay nanocomposites (Wong et al), 4,5 and the effect of dispersion of clay layers in polymer chains on dielectric properties and dielectric constant of polylactide-clay (Pluta et al), 6 and of polymer-clay composite constructions (Rick D. Davis et al), 7 are noteworthy.…”

“…On the other hand, the interface effect significantly changes the dielectric and mechanical properties of polymer-clay nanocomposite films, [2][3][4][8][9][10][11][12][13][14] which is why different polymeric chemicals referred to as compatibilizers are used to ensure that clay † To whom correspondence should be addressed. kadir.esmer@marmara.edu.tr, 0000-0002-1336-9259 ©2018 The Polymer Society of Korea.…”