| 摘要 |
PCT No. PCT/FR85/00294 Sec. 371 Date Aug. 14, 1986 Sec. 102(e) Date Aug. 14, 1986 PCT Filed Oct. 15, 1985 PCT Pub. No. WO86/02344 PCT Pub. Date Apr. 24, 1986.A process for preparing linear polychlorophosphazenes having a terminal -PXCl2 group, wherein X is O or S, by polycondensation of a monomer of the formula P2NXCl5, by heating to release PXCl3 and continuing the heating after the evolution of PXCl3 has stopped. In the process, at least the heat induced polycondensation phase after evolution of PXCl3 has stopped is carried out in solution in a medium which is a solvent for both the monomer and the polymer and which is inert to the constituents of the polycondensation reaction. The process reduces the amount of cross-linking and produces high molecular weight polymers in a reproducible way. |
