| 摘要 |
<p>Novel polysilazanes characterized in that they are linear and semi-crystalline and in that they comprise patterns of the general formula: -R1R2Si-NMe-SiR3R4-NMe- in which Me is the methyl radical, R1, R2, R3 and R4, the same or different, represent the hydrogen atom or saturated or unsaturated, substituted or unsubstituted, preferably C1 to C8 hydrocarbon radicals. The polysilazanes are obtained by reaction of a cyclodisilazane of the formula: R1R2[Si2N2Me2] R3R4 in which Me is the methyl radical, R1, R2, R3 and R4, the same or different, represent the hydrogen atom or a saturated or unsaturated, substituted or unsubstituted hydrocarbon radical, with a compound which is either a nucleophilic agent, or an anion radical or a strong protonic acid. Finally, the invention concerns a cyclosilazane of the formula: R1R2[Si2N2Me2] R3R4 in which Me is the methyl radical, at least one of the R1, R2, R3 and R4 radicals representing an alkenyl radical and/or the hydrogen atom, the remaining R1, R2, R3 and R4 radicals, the same or different, representing saturated, substituted or unsubstituted, hydrocarbon radicals.</p> |
