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研究了NaNO2/FeSO4·7H2O存在下苯乙烯的活性自由基聚合.发现亚硝酸钠与硫酸亚铁反应生成的 NO能够与AIBN裂解的自由基,生成氧氮自由基,且能控制苯乙烯的自由基聚合.当 AIBN/NaNO2/FeSO4 ·7H2O的摩尔比为1/2.5/2.5时,得到分子量分布较窄,分子量在5万以下可控的聚合物,实测分子量与理论分子量相近.聚合过程中转化率随反应时间增长而增高,分子量随转化率增高而增大,具有典型活性自由基聚合的特征.经纯化后的聚苯乙烯可作为大分子引发剂,引发新加入单体的聚合,证明是活的高分子.
The living free radical polymerization of styrene in the presence of NaNO2 / FeSO4 · 7H2O was studied. It was found that NO produced by the reaction between sodium nitrite and ferrous sulfate could react with AIBN to free radicals and generate oxygen and nitrogen free radicals, and could control the freedom of styrene When the molar ratio of AIBN / NaNO2 / FeSO4 · 7H2O is 1 / 2.5 / 2.5, a polymer with a narrow molecular weight distribution and a molecular weight below 50,000 can be obtained, and the measured molecular weight is similar to the theoretical molecular weight. The rate increases with the increase of reaction time, the molecular weight increases with the increase of conversion rate, and has the characteristic of typical living radical polymerization.The purified polystyrene can be used as macroinitiator to initiate the polymerization of newly added monomer, proving to be Living polymer.