Effect of power ultrasonic on the viscosity of anhydride epoxy resin system

Wilhelm, Frederik; Strauß, Sebastian; Kronseder, Maximilian

doi:10.1016/j.rinma.2020.100129

Cited by 5 publications

(4 citation statements)

References 16 publications

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“…This adhesive, as shown in Figure 9, had the highest viscosity. This is also confirmed by studies on the adhesion of epoxy resins with carbon nanotubes to, for example, carbon and aramid fibers [50,54,57,61]. The polar component was also the highest among the modified series, but the lower value of the dispersion component reduced to some extent the ability of the adhesive structure to match the unevenness of the substrate.…”

Section: Adhesion Of Glue To Concrete Substratesupporting

confidence: 60%

“…In the case of epoxies, barriers may occur at the interfaces of the liquid resin and carbon nanotube phases, which can be overcome at the higher temperatures at which the nanotubes are introduced into the resin. Issues related to changes in temperature and viscosity during sonication, described in [54], among others, speak of the dynamic nature of the changes. Over the course of sonication, the viscosity may change its value (decrease and increase) many times at the beginning, until a certain steady trend of decrease (while the temperature increases) is stabilized.…”

Section: Rheological and Adsorption Propertiesmentioning

confidence: 99%

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Changes in the Rheological and Adhesive Properties of Epoxy Resin Used in the Technology of Reinforcement of Structural Elements with CFRP Tapes

Szewczak

2023

Materials

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Nowadays, FRP composites are widely applied in the construction industry. Their inherent characteristics are used to strengthen structural elements made of various materials and to increase their durability. The following paper contains the results obtained in a conducted research program aimed at determining the ability to improve the durability of epoxy resin modified with the sonication process, microsilica and carbon nanotubes. The adhesive modified was used to adhere a CFRP tape to a concrete surface. Changes in the viscosity, physicochemical parameters and adhesion of the resin were studied. Selected parameters of the concrete substrate prepared using the sandblasting method, determined with the contact profilometry, were also taken into account. During the tests, attention was paid to the thorough execution and preparation of the samples. As a result of the research, it was demonstrated that the adhesion of the modified epoxy adhesive to concrete could be increased by approximately 28% in the case of the addition of carbon nanotubes and by up to 66% in the case of the addition of microsilica. The modifications used, in addition to increasing the adhesion of the resin to the concrete substrate, were also aimed at reducing the weakening of the adhesive joints caused by oxidation of the resin over time. The results obtained will serve as a basis for evaluating the possibility of their use in the practical reinforcement of structural reinforced-concrete elements.

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Section: Adhesion Of Glue To Concrete Substratesupporting

confidence: 60%

Section: Rheological and Adsorption Propertiesmentioning

confidence: 99%

Changes in the Rheological and Adhesive Properties of Epoxy Resin Used in the Technology of Reinforcement of Structural Elements with CFRP Tapes

Szewczak

2023

Materials

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“…It indicates that ultrasonic field can endow ions in the electrolyte with a certain amount of energy, thus accelerating the movement rate of ions. [55][56][57] This also verifies that the peak current density of redox reaction can be increased by ultrasonic in part 3.1.…”

Section: Influence Of Ultrasonic Field On the Physical Performance Of...mentioning

confidence: 52%

Effect of ultrasonic field on the performance of an iron‐vanadium flow battery with non‐aqueous deep eutectic solvent electrolyte

Sun

Zhang

Zhou

et al. 2022

Intl J of Energy Research

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The non-aqueous redox flow battery (NARFB) has received extensive attention due to its unique advantages, for example, wide electrochemical window and potentially high energy density. However, the low performance of NARFB still hinders its wide application. Our previous research studies have shown that the exertion of external fields is a promising solution for improving cell performance. In this work, firstly, cyclic voltammetry (CV) is used to study the influence of ultrasonic power density on V(III)/V(II) and Fe(II)/Fe(III) redox couples on transport and electrochemical characteristics in the deep eutectic solvent (DES), which functions as the electrolyte of a NARFB. It is found that adding ultrasonic field to the DES electrolyte is an effective method to enhance mass transfer by accelerating the movement of ions. With the change of ultrasonic power density, the viscosity decreased by more than 10%. The conductivity increased from 8.58 usÁcm À1 at 15 C without ultrasonic power to 14.81 usÁcm À1 at 35 C and with 0.28 WÁcm À2 ultrasonic power density. Then

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“…Reducing resin viscosity by increasing the resin temperature in order to improve impregnation ability is an effect studied under different aspects in the context of pultrusion [ 42 , 43 , 44 ]. As the temperature increases, the viscosity of resin systems decreases and the processing window shortens [ 44 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Simulative Analysis of the Pressure Development in a Closed Injection Pultrusion Process with Multiple Chamber Geometries

et al. 2023

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The use of innovative higher-performance highly reactive resin systems requires an enhancement of the established method of fiber impregnation (open bath) towards closed resin-injection pultrusion (CIP), due to the short pot life of the resin systems. The result is that the open bath is developed into a closed injection and impregnation chamber (“ii-chamber”). In this study, three parameters—resin viscosity, opening angle and opening factor at the injection point on the ii-chamber—are varied, each in three stages. For each set of parameters, a pultrusion trial is conducted and the process pressures in the ii-chamber and pultrusion die measured. This enables direct feedback via the process conditions of the as yet uncured composite. The data obtained are used to validate a newly developed simulation model. The model is based on Darcy’s law, which has been extended to take fiber movement into account and thus represent the resulting pressure increase in the die. The flexible ii-chamber and die concept enhance our understanding of the processes taking place in the die system. The sensitivity of the process pressures can be shown for the three influencing variables. The experiment shows that of the three influencing variables investigated, viscosity has the greatest sensitivity to pressure development. In general, it can be said that over the length of the pultrusion die system, the pressure level increases across the three measuring points.

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Effect of power ultrasonic on the viscosity of anhydride epoxy resin system

Cited by 5 publications

References 16 publications

Changes in the Rheological and Adhesive Properties of Epoxy Resin Used in the Technology of Reinforcement of Structural Elements with CFRP Tapes

Changes in the Rheological and Adhesive Properties of Epoxy Resin Used in the Technology of Reinforcement of Structural Elements with CFRP Tapes

Effect of ultrasonic field on the performance of an iron‐vanadium flow battery with non‐aqueous deep eutectic solvent electrolyte

Experimental and Simulative Analysis of the Pressure Development in a Closed Injection Pultrusion Process with Multiple Chamber Geometries

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