STRUCTURE WITH MAGNETIC PROPERTIES. 3. OBTAINMENT POSIBILITIES OF A COMPOSITE MACROMOLECULAR MATRIX - BIOLOGIC ACTIVE COMPOUND

摘要

Magnetic molecular materials have received a tremendous attention in the recent years. Properties such as very low conductivity, transparency, low elasticity modulus, chemically tuneable properties and good processability, add to the basic importance of these materials the interest of their potential usefulness. Besides some industrial applications based in just the properties that the presence of magnetic moments confers to a particular compound (e.g.: high-spin molecules), the magnetic ordering at sufficiently high temperature involving the presence of net magnetic moments is required for the most part of the potential applied interest of these materials. These constraints are indeed, a formidable challenge for the synthetic chemist and have stimulated the development of very imaginative synthetic strategies. A classification of the different types of polymeric materials exhibiting magnetic behaviour can be as following: - coordination and organometallic polymers consisting in metal ions and organic ligands; - organic polymers containing free radicals in the repetitive unit, and - magnetic composite. In the paper some obtainment kinds of a macromolecular complex (based on polystyrene and their copolymers) - biologic active compound (collagen) with the purpose to realize polymeric composite with magnetic properties, are presented. There are two strong reasons for the genuine interest of these materials. First, the nanometric size of these particles and the general simplicity of the synthetic processes provide an interesting route to the preparation of nanometric magnetic particles, something that has strong technological interest. Second, these composite materials rudimentarily resemble nature composite due to their formation mechanism.