| 摘要 |
PURPOSE:To increase intrinsic viscosity, decrease reaction time, and improve mechanical strengths by conducting the polycondensation of an alkali metal sulfide with a dihalide compd. in the presence of a specific quaternary ammonium salt. CONSTITUTION:An alkali metal sulfide (e.g. sodium sulfide nona-hydrate) and a dihalide compd. of formula I (wherein R<5> and R<6> are each H or a hydrocarbon group; and R<7> is a direct bond or a hydrocarbon group) (e.g. 1,6-dibromohexane) are polycondensed in the presence of a phase transfer catalyst comprising a quaternary ammonium salt of formula II (wherein R<1> to R<4> are each an aliph. alkyl group provided that at least two of them are 6C or higher alkyl) (e.g. trioctylmethylammonium chloride) in a solvent at 50-150 deg.C. |
