SynopsisHeterogeneous curable compositions of divalent metal salts of mono(hydroxyethy1) phthalateanhydride-bisphenol A diglycidyl ether (BADG) systems were prepared by merely mixing these components at room temperature. Stability at room temperature and cure properties at high temperature of the compositions were investigated for evaluating their applicability as one part adhesive. It was found that the systems containing Mg were generally more stable than those containing Ca. Similarly, at 150°C the Cacontaining systems showed generally shorter gelation time than the Mg-containing ones, due to the fact that the Ca salt dissolves more rapidly and enters into the addition reaction with the anhydride, leading to the faster appearance of the catalytic activities of the Ca carboxylate group. Among the various combinations of components, the metal salt-succinic anhydride (SAkBADG systems were stable at room temperature for more than 6 months and rapidly cured at high temperature, showing excellent adhesive properties. This result indicates that the SA-containing systems should be of interest in applications to one part adhesives.

Alumina-supported PdO is largely accepted as an effective catalyst for the methane combustion reaction. In this study, we investigated the influence of the addition of CeO 2 to the PdO catalysts supported on -Al 2 O 3 on their microstructures by XAFS spectroscopy and X-ray diffraction technique (XRD).We obtained the radial structure functions (RSF) from Fourier transform of Pd K-edge EXAFS spectra of both fresh and as-tested catalysts for the PdO and PdO-CeO 2 system on alumina, respectively. A single peak, which is assigned to the nearest neighbor Pd-Pd bonds in Pd metal, was seen after the catalytic activity test at 573 K under a methane-oxygen stream. This is consistent with the fact that PdO in both the catalysts are reduced to metallic Pd at 573 K. In the fresh PdO-CeO 2 catalyst, the second-and third-neighbor peak intensities in the RSF were reduced to about one-half, compared with those in the fresh CeO 2 -free catalyst, while these catalysts showed the same peak intensities for the nearest neighbor RSF. These results suggest that CeO 2 induces disordering of the outer shells of Pd scattering atoms in the PdO catalyst. It can be presumed that CeO 2 improves the dispersiveness of PdO particles over the support and depresses the aggregation among the particles.

synopsisPreparation of polyvalent metal salts of ethyleneglycol-methacrylate-maleate (EMM) was investigated by the reaction of Na salt of EMM and chlorides of polyvalent metals such as A13 t, Cr3 t, Fe3 t, Nip +, Cop t, and Cup +. It was found that, among the metal salts obtained, the Cr salt could be obtained in the form of (EMM-)sCr(OH) in high purity, where EMM-means EMM residue, CHI CH~-COOCHpCHpOOCCH=cHcoo Then, (EMM-)zCr(OH) was copolymerized with styrene, MMA, and hydroxyethyl methacrylate. I n the copolymerization, the rates of copolymerization increased markedly as the concentration of (EMM-)&r(OH) increased. As for the physical properties of the copolymers obtained, Rockwell hardness and compressive strength can be improved by introducing (EMM-)&r(OH) into the polymers, and HDT, tensile, and flexural strengths can also be improved by selecting the most suitable concentration of (EMM-)ZCr(OH) according to the species of vinyl monomer. Further, TGA and boiling water resistance of the copolymers are also discussed.

SynopsisPreparation of polyvalent metal salts of ethyleneglycol-methacrylate-phthalate (EMP) was investigated by the reaction of the Na salt of E M P and chlorides of polyvalent metals such as M3+, Cr3+, Fe3+, Ni2+, Co2+, and Cu2+. It was found that, among the metal salts obtained, the Cr salt could be obtained in the form of (EMP-), Cr(0H) in high purity and good yield where EMP-means E M P residue: (EMP-)Z-Cr(0H) is soluble in chief organic solvents and vinyl monomers such as styrene (St) and MMA.As for the physical properties of the copolymers obtained, heat distortion temperature, compressive strength, and Rockwell hardness were generally improved by introducing (EMP-2)Cr-(OH) into the polymers. Tensile strength, flexural strength, and impact strength were also improved by selecting the most suitable concentration of (EMP-)&r(OH) according to the species of vinyl monomers. Moreover, the physical properties of (EMP-)zCr(OH)-MMA copolymers are generally superior to those of (EMP-)&r-(OH)-St copolymers. TGA and boiling water resistance of the copolymers were also discussed.(EMP-)ZCr(OH) was then copolymerized with St and MMA. 2289

No abstract