Fabrication of bisphenol-free boron-siloxane polymers

Interest in the preparation of magnetoactive boron-siloxane polymers (MBP) has been stimulated by recent scientific developments. However, recent regulations have prohibited the inclusion of Bisphenol-A normally employed in the manufacture of commercially available products. In the following publication, two different routes for the preparation of magnetoactive borosiloxane polymers have been taken. First, the possibilities of obtaining homogeneous mixtures of magnetoactive polymers by mixing the magnetic particles with the polymer using solid CO 2 (dry ice) and stirring (shearing) are investigated. In the course of the work, an approach for the preparation of reference materials of different viscosities was made to prove the transferability to other elastomers. This is then followed by a brief review of the reaction of the polymer with different solvents in relation to the mixing with particles. In manually kneaded compounds, dispersions ranging from 0.00004 to 0.004 particles per mm 3 are common. The process described in this work resulted in agglomerations of no greater than 0.00004 particles per mm 3 A possible synthesis route for bisphenol-free boron-siloxanes is then considered, in which polydimethylsilane (derived from dichloro(methyl)silane), boric acid, and iron(III) chloride undergo polycondensation to form the polymer matrix. • Synthesis of Boron-Siloxane Polymers. • Elimination of the need for Bisphenol-A and other toxic components. • Combination of ferromagnetic micro particles with a rheopectic polymer matrix. • Use of thermal mixing and cryogenic (CO 2 ) cooling for mixture homogenation. • Dilution of compounds to produce shear hardening magnetorheological fluids.