New ceramics-polymer composites of a matrix from an alumina ceramic porous material
Mikołaj Szafran*, Wojciech Lipiec*, Justyna Okowiak*, Katarzyna Konopka**, Krzysztof J. Kurzydłowski** *Politechnika Warszawska, Wydział Chemiczny, ul. Noakowskiego 3, 00-664 Warszawa **Politechnika Warszawska, Wydział Inżynierii Materiałowej, ul. Wołoska 141, 02-507 Warszawa
Annals 3 No. 8, 2003 pages 337-342
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abstract The results of studies concerning the obtaining of ceramic-polymeric composites in which the matrix is a ceramic porous material of alumina, in the pores of which an organic polymer is placed, are presented in the paper. The ceramic porous material was obtained by sintering electrocorundum grains with the addition of fine-grained alumina as a binder. Poly(methyl methacrylate) was the polymer introduced to the pores of the ceramic porous material by filling the pores with the monomer by means of a vacuum apparatus and then carrying out the polymerization in the pores of the ceramic material. An organosilicon coupling agent (3-aminopropyltriethoxysilane) was used for increasing the adhesion between the ceramics and polymer, and to improve the strength properties of the composite obtained. In the studies it has been shown that the presence of the polymer in the ceramic material pores, especially at simultaneous addition of the adhesion promoter, causes a considerable increase in the mechanical strength of the composite in comparison to that of the ceramic porous material. In Table 1 are presented the results of measurements of physical parameters for samples from porous ceramic materials and samples with the introduced polymer (with and without using a coupling agent); in Table 2 are presented the results of strength studies of particular types of samples. In Figure 1 is presented the stress - strain relationship for samples with the polymer and for comparison without the polymer. From this Figure it results that the composite of this type behaves as a pseudoplastic body. Pictures of the studied samples microstructure obtained in a scanning electron microscope (Figs. 2 and 3) are also presented. The studies show that by introducing the polymer into the pores of the ceramic porous material by polymerizing the monomer directly in the pores, a composite of a considerable degree of pore filling reaching ca. 73% can be obtained. Key words: ceramics, ceramic porous material, polymer, composite, coupling agent