Coupling agent and glass fibers in polyester mortar

Abstract

This study investigates the influence of aggregates, glass fibers and a coupling agent on the compressive and flexural (three‐point and four‐point bending) behavior of a polyester mortar. Particle size of fine aggregates (quartz and limestone) varied from 0.1 to 5 mm (0.004 to 0.2 inch) and the glass fiber content was varied up to 6% by weight of mortar. A silane was introduced into the polyester mortar by pretreating the aggregates and the glass fibers. The mechanical properties of mortar were studied at room temperature. The test results indicate that the selection of aggregate type, size and distribution is very important. Silane treated aggregate systems showed more than 66% increase in compressive strength and 35% increase in flexural strength when compared to the untreated systems. Addition of glass fibers enhances the strength and toughness of the polyester mortar, and silane treatment of glass fibers helps to further enhance these properties. Flexural (three‐point bending)‐to‐compressive strength ratio varied from 0.28 to 0.35 for unreinforced system and from 0.26 to 0.54 for the reinforced system. The mortar with only 14% polyester and 86% aggregates (by weight) and a coupling agent had a compressive strength of 103 MPa (15,000 psi) which is 94% of the polyester polymer strength. A stress‐strain relationship is proposed to represent the complete stress‐strain response under compression and flexural loading. Also, a method is proposed to quantify the failure patterns.

The role of additives in the manufacture of sheets of unsaturated polyester and postconsumer unsaturated polyester/glass fiber composites: Mechanical and dynamic mechanical properties

“…Nevertheless, the mechanical analysis of these samples revealed that the addition of silane-coupling agent did not improve the mechanical properties, as observed in other systems, such as those containing virgin glass fiber. [12][13][14] One possible reason for these unsuccessful results may be that the silane-coupling agent is more efficient in modifying the glass fiber surface but that it is unable to modify the surface of fibers covered with a residual resin layer.…”

“…An improvement of interface adhesion can be achieved by treating the filler with silane-coupling agents or by adding silane to the composition during mixing. 11 Works from the literature [12][13][14] show an increase in the mechanical properties of polyester composites when fillers and fibers are treated with silanecoupling agents.…”

Effects of temperature and strain rate on the tensile behavior of polypropylene composites insulator coatings used in offshore deepwater pipelines

“…In the case of fiber glass-polymer composites, the fiber choice, arrangement, and proportions are independently controlled by the fabricator. 1,[6][7][8] investigated the tensile behavior of polypropylene (PP) in the temperature range of 20 to 150 8C and have focused on the PP physical properties, morphology and microstructure. 3,9,10 investigated the rate dependent deformation of PP at room temperature under uniaxial compression.…”

“…In addition, polymer composites are highly noncorrosive, with the ability to be tailored and designed to any shape and size. In the case of fiber glass‐polymer composites, the fiber choice, arrangement, and proportions are independently controlled by the fabricator . investigated the tensile behavior of polypropylene (PP) in the temperature range of 20 to 150 °C and have focused on the PP physical properties, morphology and microstructure .…”

Effect of bonding agents on styrene butadiene rubber–aluminum powder composites

“…Several reports on coupling agents, their uses, mechanism by which they act, substrates, adhesive systems, and theories of adhesion are available. 9–13 Alkoxy silane coupling agents 14–16 have been used to modify the interface between wood fibers and polymers. Wolf 17 made a detailed study on the optimization of silane coupling agents in silica filled compounds with mixing temperature and time.…”