Modifications of Epoxy Resins and their Influence on their Viscosity

Szewczak, Andrzej; Szeląg, Maciej

doi:10.1088/1757-899x/471/2/022038

Cited by 14 publications

(18 citation statements)

References 2 publications

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“…3). Obtained test results, considered together with the results presented in [16,17] indicate fundamental differences in the mechanical properties of the described composites. Based on the research the following conclusions were made:…”

Section: Ep52+nrmentioning

confidence: 86%

“…[12][13] The amount of filler usually depends on the weight of the resin (volumetric dosing is less accurate due to the change of resin density with temperature changes). In order to ensure regular and effective distribution of the filler in the volume of resin, in the technology of polymers the ultrasound are used [14][15] [16] [17]. Dynamic phenomena caused by ultrasound (high frequency vibrations, cavitation, pressure and temperature changes) cause the formation of temporary atomic bonds between the filler particles and the polymer chains.…”

Section: Introductionmentioning

confidence: 99%

“…The adopted method of changing resin parameters affects all their performance properties. In [16] [17] the results of research on rheological and adhesive properties are presented. It has been shown how ultrasound and fillers affect the viscosity, temperature and adhesive parameters (free surface energy measured by the Owens-Wendt method was used as the factor describing the adhesion of resin to the substrate).…”

Section: Introductionmentioning

confidence: 99%

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Impact of epoxy resin modification on their strength parameters

Szewczak

2020

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Modifications of polymer composites are one of the fastest developing fields of technology. Research is focused on two directions: obtaining new composites or modifying existing materials. The first group of tests uses methods for preparing new chemical formulas of polymers containing, as the main structural element: carbon (organic polymers) or silicon (inorganic polymers). In the second group, the research consists in seeking methods to modify the properties of polymers. In building construction, among the others types, the glues (adhesive polymers) are used. They are exerted to connect materials with different physical andmechanical properties. Under the influence of the factor initiating the crosslinking reaction (hardener or temperature), the polymers obtain a solid form. The strength of the glued joint depends on the initial parameters of the glue resin and the target substrate of its application.The glued surface is usually the weakest element in this connection in terms of the possibility of damage due to the effects of loads, therefore methods to improve the strength parameters of adhesives are sought. The study presents the results of own research on methods of modification of a selected epoxy resin used in the technique as a glue. In order to ensure effective mixing of the adhesive with the fillers, ultrasound energy was used. After the resin had hardened, tests were carried out to determine the hardness and tensile strength of the obtained composites. Based on the results, SEM analysis and observation of the effect of ultrasound, the phenomena affecting the changes in the above mechanical properties were explained.

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Section: Ep52+nrmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of epoxy resin modification on their strength parameters

Szewczak

2020

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“…Viscosity is a parameter describing the state of cohesion and equilibrium of hydrocarbon molecules inside the polymer in liquid state, before its hardening. Its size is influenced by temperature, polymer density, types of functional groups and molecular spacing [ 38 , 39 , 40 ]. Adding a filler to the adhesive may significantly affect its viscosity and, as a consequence, the degree to which the adhesive fills irregularities occurring on the surface, e.g., concrete [ 39 , 40 ].…”

Section: Introductionmentioning

confidence: 99%

“…Its size is influenced by temperature, polymer density, types of functional groups and molecular spacing [38][39][40]. Adding a filler to the adhesive may significantly affect its viscosity and, as a consequence, the degree to which the adhesive fills irregularities occurring on the surface, e.g., concrete [39,40]. However, the problem is the correct mixing of the adhesive and the filler.…”

mentioning

confidence: 99%

Physico-Mechanical and Rheological Properties of Epoxy Adhesives Modified by Microsilica and Sonication Process

Szewczak

Szeląg

2020

Materials

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Industrial waste from the production of metallic silicon and silicon–iron alloys, which includes silica fumes (microsilica), is subject to numerous applications aiming at its reuse in concrete and polymeric composites. Recycling solves the problem of their storage and adverse environmental impact. Six different formulas of epoxy resins were tested, differing in the type of polymer, the mixing process (sonication or not) and the presence of microsilica. The study showed that microsilica added to the epoxy resin changes its viscosity and free surface energy, and these are the parameters that determine the adhesion of the polymer to the concrete surface. Strength tests and SEM analysis have determined how microsilica molecules can penetrate the structure of polymer macromolecules by filling and forming temporary chemical bonds. Mixing the fillers with the adhesive was achieved by using a sonication process. The analysis of the obtained results showed that, depending on the initial composition of the polymer, the addition of microsilica can change the chemical, physical and mechanical properties of the hardened adhesive to varying degrees. In the case of adhesives used in the construction industry to strengthen and glue structural elements, these changes significantly affect the durability of the adhesive joints.

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