Modification of reinforced polymer materials in a static magnetic field

Abstract

Different magnetic treatments were investigated and recommendations were made concerning industrial application of magnetic treatment of fibres freshly impregnated with binders in fabrication ofIn a homogeneous static magnetic field (SMF), orienting moment M acts on a particle of a substance [ 1 ] M= AX B2Vsin 2et, (1) 2~to where A Z is the difference in the magnetic susceptibility of the particle in directions parallel and perpendicular to its axis;/.t o is the magnetic constant; B is the magnetic induction; V is the volume of the particle; ot is the angle between the axis of the particle and the lines of force of the ME Moment M attempts to turn the particle so that the direction of its major axis will coincide with the direction of the magnetic lines of force.In an inhomogeneous magnetic field, force F arises:21a0 where Z is the permeability averaged over the volume.Force F attempts to orient the particle along the field gradient, i.e., perpendicular to the direction of the lines of force of the SMF [2].Magnetic moment M and force F can lead to the formation of anisotropic structures oriented along or across the direction of the lines of force of the SMF, respectively. These results of exposure to SMF are practically manifested if the viscosity of the material is sufficiently low. In polymer systems, this is possible in solutions and melts, and the molecules of the oligomer or segments of the macromolecules are the oriented particles. Such studies have primarily been conducted for unfilled polymers [ 1,2], and less frequently for filled systems [3]. The practical application of magnetic treatments in industry will make it possible to regulate the structure of polymer materials and improve their strength characteristics.The scientific novelty of the research described here is that the effect of SMF on the kinetics of curing, structure, and properties of SF-342A reinforced aniline--phenol--formaldehyde resin and some reinforced systems based on ED-20 epoxy resin was investigated for the first time.The technical novelty consists of the development of a simple and economically efficient industrial method for magnelic treatment of fibres freshly impregnated with binder instead of prolonged holding of the reinforcement in an excess of binder in a SMF [4].

Reinforced Polymer Composites Based on Unsaturated Ester Resin PN-15

“…As a result of MT of binder-impregnated cords, there is a considerable increase in the strength characteristics of the PCs compared with materials produced without MT. The main causes of strengthening are increase in the anisotropy of the PC and in the adhesion between the binder and the filler [4].…”