structure structure (solids and liquids) D 2000
-004Ternary Molybdates Rb1-xMg1-xR1+x(MoO4)3 (R: Sc, Lu; 0 ≤ x . ltoreq. 0.3-0.2). -X-ray studies on the title molybdates, prepared by the solid state method at high temp. from the individual molybdates, indicate a monoclinic distortion of the rhombohedral structure which is present in Na-and K-analogues of the Rb-molybdates. Parameters of the unit cells and information on the conductivity in the temp. range 250-650 . degree.C are given. -(KOZHEVNIKOVA, N. M.; ERMAKOVA, E. P.; MOKHOSOEV, M. V.; Zh.
DTA and DSC data revealed that the use of heteropoly compound additives allows an increase in the temperature of polybismaleimide radical polymerization by 2ff450 deg in comparison with the value for the initial olygomer. TG data showed that in the presence of certain amounts of the inhibitor the polymer thermoresistance does not decrease. The range of effective concentration of the inhibitor is 1-5 wt.%.The attempts to increase the technological effectiveness of synthesis and reprocessing of heterocyclic polymers has stimulated a new tendency, viz. the synthesis of low-molecular oligoimides, fusible and soluble in organic solvents, having end-functional groups or multiple bonds capable of polycondensation or polymerization under definite conditions.The most interesting of them are polybismaleimides (PBMI), which form the basis of industrial polymer material [1, 2] production in some countries. The comparatively low melting point (80-120 ~ of PBMI allows their application as thermoresistant impregnated and poured compounds. However, the presence of multiple carbon-carbon bonds, leading to the formation of cross-linked structures, promotes a rapid increase in melt viscosity, which hampers product manufacture. It is not a solution to prolong the time of melt viability by the traditional method of inhibition of polymerization through quinone [3] application, and the addition of considerable quantities of inhibitor results in deterioration of the polymer thermoresistance.It is well known that metals with variable valency, and Fe 3+ in particular, being electron donors, are capable of inhibiting vinyl monomer [4] polymerization.Hence, it was of interest to study the possibility of inhibiting the PBMI polymerization process by using heteropoly compounds (HPC) that are polynuJohn Wiley & Sons, Limited, Chichester Akad~miai Kiad6, Budapest
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