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用电子自旋共振(ESR)谱法研究了GeCl_4存在下的乙酸乙烯酯(VAc)与丙烯酸(AA)的自由基共聚合反应。结果表明,VAc聚合时,加与不加GeCl_4所得ESR谱图及有关参数基本相同;AA聚合时,不加GeCl_4得5重谱线,加入GeCl_4则得到3重谱线,两种情况下,偶合常数A相差约30％。VAc-AA共聚合时,不加GeCl_4,AA初期反应快,后期VAc反应快;加入GeCl_4后,VAc自由基与AA自由基的ESR信号随时间的增长均无明显变化,可形成交替共聚物。
The radical copolymerization of vinyl acetate (VAc) with acrylic acid (AA) in the presence of GeCl_4 was studied by electron spin resonance (ESR) spectroscopy. The results showed that when VAc was polymerized, the ESR spectrum and the related parameters were the same with and without GeCl_4. When AA was polymerized, without adding GeCl_4, the 5-fold line was obtained. When GeCl_4 was added, the triplet spectrum was obtained. In both cases, A difference of about 30% constant. When VAc-AA was copolymerized, the initial reaction was fast without addition of GeCl_4, and the VAc reaction was rapid at the later stage. After addition of GeCl_4, there was no obvious change in the ESR signal of VAc and AA with time.