Abstract
This paper studies the mechanical properties including traction, flexion, compression, and hardness characteristics of a composite made from the combination of epoxy resin and granitic stone powder from the fold-and-thrust belt located in the municipality of Nossa Senhora da Gloria, in the state of Sergipe, Brazil. Chemical and mineralogical analyses of the stone and analysis by SEM of the particle/matrix interface are performed. Two Granite types, named 53-A and 12-A, were incorporated with different mass percentages of 0%, 30% and 50%, in the polymeric matrix, DGEBA, formed by the Araldite polymer GY 279 and the curing agent Aradur 2963. The test results with 50% show a compression of 79 MPa with a maximum increase of 121% compared with the pure epoxy resin.
Highlights
Epoxy resins are highly reticulated thermosetting polymers which are easy to process, with high-performance, containing at least two epoxy groups per molecule[1,2,3]
This study proposes the use of feldspar-rich stone powder in order to produce a particulate composite, because it is favored by good adsorption with epoxy resin[32]
Improvements in some properties are frequently followed by a decrease in other properties
Summary
Epoxy resins are highly reticulated thermosetting polymers which are easy to process, with high-performance, containing at least two epoxy groups per molecule[1,2,3]. The epoxy ring is formed by two carbon atoms bonded to an oxygen atom, in which the angle of a C-O bond is 61°24’[4,5], by means of a simple covalent bond[6] Due to their high reactivity, epoxy rings may be used in several mechanical applications because of their good adhesive properties, rigidity, specific resistance, dimensional stability, chemical resistance and high fluidity prior to curing which allows for an easy processing[7,8,9,10,11,12]. A great deal of attention has been paid to the improvement of the mechanical properties of pure epoxy resin[8,19,20,21,22] This has included using many types of loads, such as glass particles, ceramics, silicates, and rubbers[8,11,12,23,24,25,26,27] among others. Combining suitable amounts of other materials allows the inherited properties of the components to contribute to the creation of new materials with adjusted and improved characteristics[9]
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