Effect of fluid–particle-interactions on dispersing nano-particles in epoxy resins using stirred-media-mills and three-roll-mills

Abstract

. Effect of fluid-particle-interactions on dispersing nano-particles in epoxy resins using stirred-media-mills and three-roll-mills. Composites Science and Technology, Elsevier, 2010, 70 (4), pp.657. <10.1016/j.compscitech.2009.12.021>. <hal-00615120> Accepted ManuscriptEffect of fluid-particle-interactions on dispersing nano-particles in epoxy resins using stirred-media-mills and three-roll-mills This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Fibre reinforced composites are indispensable in the field of modern lightweight structures, such as used in aerospace, automotive industry or in wind power plants. Those materials provide high weight savings and increase the efficiency of a structure significantly. Therefore, various efforts are made to continuously improve the quality of the matrix and the fibres. By embedding nanoparticles into the epoxy matrix, the mechanical properties as well as the electrical and thermal characteristics can significantly be improved [1]. In most cases these nano-sized particles are produced as dry powders not ACCEPTED MANUSCRIPT 2 as single primary particles but rather as particle collectives consisting out of several primary particles. ACCEPTED MANUSCRIPTFor the application in reinforced composites the particles must be suspended in epoxy resin as separately dispersed primary particles or in a certain aggregate size. Generally, the influencing parameters to break up the aggregates in a dispersion process can be divided into the stress mechanism, the intensity and the frequency of the dispersing machine itself, the properties of the dispersed particles (e.g. the particleparticle-interactions) the properties of the homogenous phase and the particle-resin-interactions. Besides the effect of the chosen dispersing machine the optimization of the dispersing process was investigated by applying modified particle surfaces and varying the fluid properties. The results show that the surface properties of the particles must fit to the epoxy resin properties and the attractive forces between the primary particles must be reduced or the stabilization improved, respectively. An indication for an improved stabilization and adjustment of the particles surface properties to the fluid properties can be obtained by measurements of the contact angle and the rheological properties. Generally, an increase of viscosity and mass fraction of the product leads to a higher energetic efficiency of the dispersion process in the stirred media mill and three-roll-mill.

Production of Highly Loaded Nanocomposites by Dispersing Nanoparticles in Epoxy Resin

“…Thus, the smallest particle sizes can be realized by using non-modified particles at high solids concentrations. Similar dependencies of particle modifications and epoxy resin have already been found by Schilde et al [7] where various alumina nanoparticles were dispersed with the help of shear mixing techniques on a three-roller mill.…”

Magnetostrictive properties of epoxy resins modified with Terfenol-D particles for detection of internal stress in CFRP. Part 1: Materials and processes

“…Depending on the class of particles, a wide range of methods for the investigation is used to obtain this information. It should be mentioned that the degree of particle distribution has a strong impact on the quality of the results underlining the need for an effective dispersion technique as exemplified in [25].…”

Synthesis, Structure and Mechanics of Nano-Particulate Aggregates

“…Typically, a redispersion is necessary to obtain separately dispersed primary particles or defined aggregate sizes. The influential factors for such a dispersion process can be classified into the formulation of the homogenous phase, the stress mechanisms, intensity and frequency of the dispersing device, and the mechanical aggregate properties generated during particle synthesis [31,41].…”