A kinetic study of acrylamide polymerization initiated by 4.4′‐azo‐bis‐4‐cyanopentanoic acid in aqueous solution
A kinetic study of acrylamide polymerization initiated by 4.4′‐azo‐bis‐4‐cyanopentanoic acid in aqueous solution
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水溶液中4.4′-偶氮双-4-氰基戊酸引发丙烯酰胺聚合的动力学研究
DOI：
10.1002/macp.1972.021580104
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发表时间：
1972
影响因子：
2.5
通讯作者：
A. L. Fricke
中科院分区：
文献类型：
--
作者：
M. Baer;J. A. Caskey;A. L. Fricke
构建了膨胀计来研究低于 0.1 M 单体的丙烯酰胺的自由基聚合动力学。聚合反应由4.4'-偶氮双4-氰基戊酸在25℃的水溶液中引发。
根据初始浓度 [M] = 0.093 M 和 [I] = 2.09·10−3M 的测试的膨胀和粘度数据计算出的 fkd 值为 2.81·10−8 sec−1。与 25°C 下 kd 的外推文献值进行比较表明，效率值 f 等于 0.65。 fkd 和 f 的大小与其他引用的调查结果相当。
聚合速率对[M]的3/2级依赖性的结果证实了丙烯酰胺浓度指数在低于0.1M单体时增加到1.0以上的明显趋势。笼子效应理论被用来解释这种现象。
A dilatometer was constructed to study the free radical polymerization kinetics of acrylamide below 0.1 M monomer. The polymerization was initiated by 4.4′-azo-bis-4-cyano-pentanoic acid in aqueous solution at 25°C.
The fkd value, calculated from dilatometric and viscometric data for a test with initial concentration [M] = 0.093 M and [I] = 2.09·10−3M, was 2.81·10−8 sec−1. Comparison with an extrapolated literature value for kd at 25°C indicated an efficiency value, f, equal to 0.65. Both fkd and f were comparable in magnitude to results of other cited investigations.
The results of a 3/2 order dependency of polymerization rate on [M] substantiated the apparent tendency of acrylamide concentration exponents to increase above 1.0 below 0.1 M monomer. A cage effect theory was offered as an explanation for this phenomenon.