9,9'-二芴-9,9'-二醇的合成及其引发甲基丙烯酸甲酯自由基溶液聚合的研究

采用Zn-ZnCl₂还原偶联法，在四氢呋喃水溶液中合成了9,9′-二芴-9,9′-二醇(BFDOL)，反应温度为30℃时转化率可达81.5%。使用傅立叶变换红外光谱仪、紫外-可见光分光光度计以及质子核磁共振谱仪对BFDOL的结构进行了表征确认。进而将BFDOL作为自由基引发剂，对其引发的甲基丙烯酸甲酯(MMA)溶液聚合进行了研究，结果表明，BFDOL在四氢呋喃、甲苯和苯甲醚中均可引发聚合反应，尤其是在四氢呋喃溶剂中，低温条件也可引发MMA聚合反应；温度对聚合反应速率及聚合物分子量的影响符合自由基聚合的特点；自由基聚合的引发反应通过氢转移引发途径实现。

Synthesis of 9,9'-bifluorene-9,9'-diol and its application as a radical initiator in the solution polymerization of methyl methacrylate

9,9′-Bifluorene-9,9′-diol (BFDOL) has been synthesized by a redox-coupling method with Zn-ZnCl₂ in aqueous tetrahydrofuran (THF). At the optimum reaction temperature, 30℃, the yield reached 81.5%. The structure was confirmed by FT-IR spectroscopy, UV-Vis spectroscopy and ¹H-NMR spectroscopy. BFDOL was investigated as an initiator for methyl methacrylate (MMA) polymerization in different solvents. The influence on the polymerization of varying the temperature was the same as that for conventional radical polymerization. BFDOL could initiate the polymerization of methyl methacrylate at 40℃ in THF, showing for the first time that it is not simply a high temperature initiator. The results showed that the primary radical is likely to initiate MMA polymerization mainly through a hydrogen atom transfer process.