Rubber thin films microwave absorbers obtained by magnetic field application

Abstract

Summary form only given. The paper is aimed to investigate the possibilities for external homogeneous constant magnetic field application during the process of formation of protective composite materials, containing soft magnetic fillers: magnetite iron powders carbonyl iron. The investigations are focused on: (1) the role of the external magnetic field on the ordering and orientation of the particles in the elastomer matrix, as well as on the influence of the chemical nature of the fillers and chemical nature of the matrix in magnetic modification process; (2) the investigation of the microwave performance (especialy microwave absorption and reflection) of the obtained materials and coatings; (3) the formulation of rubber composites based on natural rubber, chloroprene rubber and nitrile butadiene rubber and soft magnetic fillers with high magnetic loss tangent: magnetite, iron powder, carbonyl iron (in some cases in combination with carbon black and graphite); (4) carrying out an optimization procedures in respect to the composites mentioned above based.on planned experiments and mathematical design; (5) obtaining rubber solutions in suitable good solvents. Treating (impregnating) different types of synthetic fabrics (polyamide, polyesters, etc.) with liquid rubber compositions. Application of external homogeneous constant magnetic fields with magnetic strength H/sub 0/ 1000-10000 G during the process of drying and vulcanization of the rubberized fabric in directions perpendicular and parallel to the fabric motion. Optimization of the most important technological characteristics: temperature of vulcanization, speed of motion, etc.