FRONTAL POLYMERIZATION OF METAL-CONTAINING MONOMERS AS A WAY FOR SYNTHESIS OF POLYMER NANOCOMPOSITES
Gulzhian I. Dzhardimalieva, Nina D. Golubeva, Anatolii D. Pomogailo
Institute of Problems of Chemical Physics Russian Academy of Sciences, Chernogolovka, Moscow Region, 142432 Russia, Email:[email protected]
The frontal polymerization of metal-containing monomers on the base of acrylamide (AAm) complexes of transition and noble metal nitrates M(AAm)[x](H[2]O)[y](NO[3])[2] (M = Co, Ni, Fe, Cu, Zn, Cd, Ba, Pd, Rh) and properties of the products obtained are studied. This is a first example of thermal (353-433 K) initiation of frontal polymerization without any chemical initiators. By examining the kinetics of thermolysis and evolution of gaseous products of transformation we have concluded that nitrogen oxides (NO[2], NO, N[2]O) formed at partial oxidation of nitrate groups are able to initiate the reaction. Occurring of reaction front and a self-sustained thermal wave are determined by structural-chemical and energy factors. The ratio of thermal characteristics affect self-organization of such systems: a self-sustained frontal mode of polymerization and its stationary velocity. We succeeded first in carrying out frontal copolymerization of acrylamide complexes with traditional monomers. The main copolymerization parameters are estimated. The ratio of thermal characteristics affect self-organization of such systems: a self-sustained frontal mode of polymerization and its stationary velocity. Following controllable thermolysis of metallopolymers formed or controlled change of frontal polymerization into burning regime leads to the formation of metallopolymer nanocomposites. The yield product is metal (or metal oxides) nanoparticles stabilized by pyrolized polymer matrix. The size of the particles is about 6 to 30 nm, polymer shell has the same sizes. The novel approach for synthesis of palladium immobilized catalysts via frontal polymerization of acrylamide complexes into surface of inorganic oxides is elaborated.
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