Epoxy Resin Composite Based on Functional Hybrid Fillers

Abstract

A study was carried out involving the filling of epoxy resin (EP) with bentonites and silica modified with polyhedral oligomeric silsesquioxane (POSS). The method of homogenization and the type of filler affect the functional and canceling properties of the composites was determined. The filler content ranged from 1.5% to 4.5% by mass. The basic mechanical properties of the hybrid composites were found to improve, and, in particular, there was an increase in tensile strength by 44%, and in Charpy impact strength by 93%. The developed hybrid composites had characteristics typical of polymer nanocomposites modified by clays, with a fine plate morphology of brittle fractures observed by SEM, absence of a plate separation peak in Wide Angles X-ray Scattering (WAXS) curves, and an exfoliated structure observed by TEM.

Synthesis and Thermal Behaviour of Novel Aliphatic/Aromatic Hepta-Cyclopentyl Bridged Polyhedral Oligomeric Silsesquioxanes (POSSs)/Polystyrene (PS) Nanocomposites

“…These substances can be considered the achievement of the chemists dream of unifying in the same products the different characteristics of both inorganic and organic compounds, different from those we can obtain by a simple blend at macroscopic level. POSSs have considerable importance owing to their excellent thermal, mechanical, optical and electrical properties [2][3][4][5][6] due to both their nanosized and cubic structure and inorganic cage [7], which allow their employment in several fields: as, for example, sensors [8], electrolyte for ion exchange membrane in fuel cell applications [9,10], novel curing agent and/or filler for epoxy system [11,12]. In the last years POSSs acquired further increasing importance due to their employment as fillers for polymer based nanocomposites [13,14] and new methods for combination of POSS and polymers has been proposed [15].…”

Green Nanocomposites from Renewable Plant Oils and Polyhedral Oligomeric Silsesquioxanes

“…So far, a variety of functional POSS derivatives have been developed. Polymerizable POSS macromers, such as vinyl-functionalized POSS and oxirane-functionalized POSS, have been employed to copolymerize with organic monomers to afford a variety of polymer/POSS nanocomposites [15][16][17][18][19][20][21][22][23][24][25][26][27]. Polymerizable POSSs make a covalent attachment to a polymer matrix possible, and POSS units are well-dispersed in a polymer matrix.…”

Chemical degradation of reinforced epoxy‐cement composites under CO2‐rich environments

“…This band is only found in the initial samples and in the nondegraded layer of the carbonated samples. In contrast, in all degraded layers, Ca(OH) 2 is no longer identified and there is three intense bands in the regions of 1,444-1,413, 874-854, and 713-712 cm 21 that are assigned to vibrations of CO 22 3 groups [68-70], confirming a complete reaction between Ca(OH) 2 and CO 2 with formation of CaCO 3 . It is noteworthy that formation of carbonate in the samples not exposed to CO 2 (initial sample and nondegraded layer) is due to their exposure to air.…”

“…Moreover, various materials have been suggested as potential fillers for polymers with the ability to enhance their properties when compared to unmodified polymers and conventional composites, depending on the filler type, shape, size, content ratio, dispersion, and adhesion between polymer matrix and filler . In this study, we looked at the reinforcement of epoxy resins with the addition of clay minerals, specifically montmorillonite (MMT), talc and agalmatolite.…”