The effect of filler particle‐size distribution in epoxy casting formulations

Abstract

The selection of particle size distribution is based on a theoretical concept of the “close packing” of particles. The usefulness of this concept was investigated using silica as the filler in a single epoxy‐hardener system. The viscosity and settling characteristics for several particle‐size distributions and concentrations of silica fillers were studied. These studies show that significant decreases in the viscosities of casting formulations can be obtained using a two‐component filler system which permits the use of higher filler loadigs. The increase in the ratio of coarse filler to fine filler reduced the flexural strength of the castings and increased the rate of settling in the formulations. The effect of parameters other than particle size is demonstrated by the use of non‐silica fillers.

Evaluation of water vapour permeability of solventless epoxy – nano talc/montmorrilonite amino‐silane coupled coatings

“…The formulations investigated with reference to the epoxy -talc/MMT are shown in Table I. From Table I we see that as the concentration of filler increases the viscosity of the resultant solution increases, this was also reported in other studies (Kuhlmann et al, 1965). Comparing the viscosities of talc and MMT it was observed that the dispersions containing MMT showed a higher viscosity as compared to talc.…”

“…Further, the addition of coupling agent resulted in an increase in the viscosity of dispersion. The observed increase in the viscosity was due to the increased interaction between the particle and the filler, this has been shown to be true for micro-fillers where the interaction between the filler and polymer matrix increased and the same would hold true for nano-fillers (Kusmono et al, 2010;Kuhlmann et al, 1965). The increase in the compatibility of the polymer matrix and the filler should also be reflected in the mechanical and barrier properties of the resultant composites.…”

Mechanical and thermal properties offishbone‐basedepoxy composites: The effects of thermal treatment

“…In a recent study, the fishbone particles (FBPs) along with Phoenix pusilla plant dry leaves showed that they could improve the tensile strength, flexural strength, and hardness by 22.5, 200, 100, and 15.2%, respectively. The interactions between the fillers and the epoxy were highlighted in details in the previous article [18] . A detailed investigation on the enhancement of the mechanical and thermal properties of the biofibers, biofilms, biopolymer, and biocomposites from the renewable and bio‐based materials was documented [19–21] .…”

“…The interactions between the fillers and the epoxy were highlighted in details in the previous article. [18] A detailed investigation on the enhancement of the mechanical and thermal properties of the biofibers, biofilms, biopolymer, and biocomposites from the renewable and bio-based materials was documented. [19][20][21] Among the bio-based materials, different types of biopolymers, like Chitosan, polysaccharide, polylactic acid, PVA, epoxidized plant oil is mentionable.…”

“…Relatively, a smaller-sized sphere of the fillers is suggested to incorporate into the polymer to get comparatively less number of voids in the composites. [18] Fishbones are considered as wastage in everywhere. It is also available in every corner of the world.…”