The great interest in polymer matrix composites containing metallic nanoparticles or cluster is motivated by wide application field of such materials: from catalysis to nanoelectronics. The polyethylene (PE), polyamides (PA), polypropylenes (PP), polystyrenes (PS) matrix are interesting as expansion and inexpensive polymers. The polytetrafluoroethylene (PTFE) matrix is very interesting because this polymer is very inert. At first glance, it would seem that poor solubility and swelling ability of PTFE in solvents hinder the introduction of different nanoparticles in this matrix and their uniform distribution over its bulk.
In searching for the solution of this problem, we have focused our attention of ultradispersed PTFE. The encapsulation was done by thermal decomposition of metallcontaining compounds (MCC) (MRn; M=Co, Fe, Cu, Ni, at all; R=CO, HCOO, CH3COO and other) in dispersion system of UPTFE in mineral oil; solution-melt PE (or PA, PP, PS) in mineral oil. Materials with concentration of a metallcontaining NP up 2 to 30 wt.% have been obtained. Nanocomposites were determined by TEM, XRD, EXAFS, Mössbauer spectroscopy and magnetic measurements. TEM studies showed that the nanoparticles (NP) are dispersed on the surface nanogranules of UPTFE matrix and in to volume polymer matrix (PE, PA, PP, PS). The used methods of researches were shown, which nanoparticles to have complex internal structure. The magnetic metering was shown the high magnetic anisotropy and coercivity (at 300K) for Co NP on the surface UPTFE 800Oe, in PE matrix coercivity Co NP - 590Oe; Fe - 960Oe; Fe2O3 NP - superparamagnetic.
This work was supported by the RFBR (02-03-32435, 04-03-32090, 04-03-32311, 04-03-32597), ISTC (project 1991), Russian Science Support Foundation and program of Russian Academy of Sciences "Critical Issues in the Physics and Chemistry of Nanoscale Systems and Nanomaterials".