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报道了一种用于偏氟乙烯-三氟氯乙烯共聚物(VDF/CTFE共聚物)制备偏氟乙烯/三氟乙烯/三氟氯乙烯共聚物(VDF/TrFE/CTFE共聚物)的新方法,该方法以CuCl与2′,2-Bpy的配合物为催化剂,N-甲基吡咯烷酮(NMP)为溶剂,异丙苯(丙酮、2,6-二叔丁基-4-甲基苯酚)为链转移剂,通过原子转移法在VDF/CTFE共聚物上产生自由基,进而利用自由基链转移反应将VDF/CTFE共聚物上部分Cl原子用H原子取代以制备VDF/TrFE/CTFE三元共聚物.对该体系的反应机理及其影响因素进行研究发现,随着实验温度的升高(80～140℃),反应时间的延长,氢化量增加,产物中TrFE含量增加;反应温度越高,初始反应速度越快,完全氢化时间越短;催化剂与氢化量的比例基本为1:1,通过控制催化剂的量可以定量控制氢化率;新的反应体系不会对产物的分子量产生大的影响.
A new method for preparing vinylidene fluoride / trifluoroethylene / chlorotrifluoroethylene copolymer (VDF / TrFE / CTFE copolymer) for vinylidene fluoride-chlorotrifluoroethylene copolymer (VDF / CTFE copolymer) The method uses a complex of CuCl and 2 ’, 2-Bpy as a catalyst, N-methylpyrrolidone (NMP) as a solvent and cumene (acetone, 2,6-di-tert- As chain transfer agent, free radicals are generated on VDF / CTFE copolymer by atom transfer method, and then some Cl atoms of VDF / CTFE copolymer are replaced by H atoms by radical chain transfer reaction to prepare VDF / TrFE / CTFE ternary Copolymer.The reaction mechanism of the system and its influencing factors were studied and found that with the increase of experimental temperature (80 ~ 140 ℃), reaction time, the amount of hydrogenation increased, the product of TrFE content increased; the higher the reaction temperature , The faster the initial reaction rate, the shorter the complete hydrogenation time. The ratio of catalyst to hydrogenation is basically 1: 1, and the hydrogenation rate can be controlled quantitatively by controlling the amount of catalyst. The new reaction system will not greatly affect the molecular weight of the product .