Effect of coupling agents on the mechanical properties of fly ash/polyester particulate composites

Abstract

Fly ash (FA)/general purpose unsaturated polyester resin (GPR) particulate composites were made. The effect of the surface treatment of FA with two different silane coupling agents (CAs) on the mechanical properties, such as the tensile, flexural, compressive, and impact strengths and hardness, of FA-GPR composites were studied. The properties of FA-CA-GPR were also compared with that of GPR and CaCO 3 -GPR. An enhancement in the tensile, flexural, compressive, and impact strengths and a decrease in the tensile and flexural moduli were observed when FA was surface treated with CA. Hardness also increases with CA-treated FA.

Effects of silica based fillers, surface treatment and curing method on mechanical properties of silica/unsaturated polyester composites

“…It can be seen by comparing with the un-treated composites (using silica content of 10 pph) in Figure 3 that incorporating the KBM-403 could improve the flexural modulus by 75%, the modulus increasing with KBM-403 content, this view being also found by Sen and Nugay 10 and Guhanathan and Davi 16 and Guhanathan et al. 17 Both curing systems exhibited similar effect on the flexural modulus for both silica fillers. This finding was line with the work by Chaowasakoo and Sombatsompop 13 which investigated the mechanical properties of fly ash/epoxy composites using conventional and microwave curing methods.…”

“…They found that the tensile and dynamic mechanical properties of cured ash/UPE composites decreased with increasing ash loading, but improved by the use of 3-methacryloxy propyl trimethoxy silane coupling agent. This view was supported by the works of Guhanathan and Davi 16 and Guhanathan et al 17 for fly ash filled unsaturated polyester composites, and of Chaowasakoo and Sombatsompop 13 for fly ash filled epoxy composites. Thongsang and Sombatsompop 14 suggested that treating the fly ash by bis-(3-triethoxysilylpropyl) tetrasulfane (Si69) at 2.0-4.0 wt% could improve the mechanical properties of natural rubber vulcanizates.…”

“…11 The majority of the fly ash applications have been for construction and building materials while a few works have used fly ash as alternative fillers in polymers. [10][11][12][13][14][15][16][17] Since hydrophobic polymers and hydrophilic fly ash particles are incompatible and yielded poor interfacial bonding and inferior mechanical properties, chemical coupling agents are usually applied to promote adhesions between the polymer matrices and fly ash through formations of siloxane bonding. 12-17 Sen and Nugay 10 studied the mechanical properties of fly ash filled unsaturated polyester composites under uncured and thermally-cured states through the effect of fly ash loading and surface treatment.…”

An Investigation into the Influence of Filler Silanization Conditions on Mechanical and Thermal Parameters of Epoxy Resin-Fly Ash Composites

“…Another advantage of filler treating is higher thermal stability of the composite, in comparison to the unmodified polymer. It is worth noting that better mechanical parameters were obtained for aminofunctional silanes in reported research where aminosilane was compared with vinylsilane [20][21][22].…”

Nanostructured Fly Ash as Reinforcement in a Plastomer-Based Composite: A New Strategy in Value Addition to Thermal Power Station Fly Ash

“…Load bearing properties of composites depend on the effectiveness of load transferred from the matrix on to reinforcement [27,41]. Figure 11 shows the variation in tensile strength (TS), elongation at break (EB), Modulus at 100 % and 300 % elongation of the composites EOC/FA, EOC/30 h MCA-FA and EOC/ 60 h MCA-FA.…”