摘要:
A process for the treatment of polyorganosilazanes and/or polyorgano(disilyl)silazanes with an effective quantity of a catalyst system comprising (i) an ionic inorganic salt of the formula M.sup.30 A.sup.-, and (II) a compound capable of complexing with the cation M.sup.+ of the salt. The M.sup.+ cation is a metal ion or a quaternary ammonium ion, and A.sup.- is a compatible anion.The polysilazanes are selected from organopolysilazanes and organopoly(disilyl)silazanes. When treated in this manner, the polysilazanes are characterized by good thermal behavior and can, in particular, be used, after pyrolysis, as precursors of ceramic products.
摘要翻译:一种用有效量的催化剂体系处理聚有机硅氮烷和/或聚有机(二甲硅烷基)硅氮烷的方法,所述催化剂体系包含(i)式M30A-的离子型无机盐,和(II)能够与阳离子M + 的盐。 M +阳离子是金属离子或季铵离子,A-是相容的阴离子。 聚硅氮烷选自有机聚硅氮烷和有机(二甲硅烷基)硅氮烷。 当以这种方式处理时,聚硅氮烷的特征在于良好的热性能,并且特别可以在热解之后用作陶瓷产品的前体。
摘要:
A crosslinkable composition comprising at least one polysilazane containing at least 2, preferably at least 3, .tbd.SiH groups per molecule and at least 2 SiR.sub.2 groups per molecule, R.sub.2 being an unsaturated hydrocarbon radical and a catalytically effective quantity of a metal element or of a metal compound to catalyze the hydrosilylation reaction SiH/SiR.sub.2.The compositions according to the invention can crosslink under the effect of heat and can be used for coating or impregnating substrates with ceramic material after pyrolysis. The mechanical properties of the crosslinked compositions are assessed by evaluating the relative rigidity RR measured by the fiber torsion pendulum method (FIG. 1).