POLYMERIZATION OF ACRYLAMIDE INITIATED BY PERSULFATE-THIOSULFATE REDOX COUPLE
POLYMERIZATION OF ACRYLAMIDE INITIATED BY PERSULFATE-THIOSULFATE REDOX COUPLE
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DOI：
10.1002/pol.1967.150051216
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发表时间：
1967-01-01
期刊：
影响因子：
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通讯作者：
RODRIGUE.F
中科院分区：
文献类型：
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作者：
RIGGS, JP;RODRIGUE.F
用电导率计测定了过硫酸盐-硫代硫酸盐氧化还原电对引发丙烯酰胺聚合的转化率-时间数据。初始速率随硫代硫酸盐浓度变化的曲线图显示了明确定义的最大值和三个不同的行为区域。在每个区域中，转化率-时间曲线的形状证明了在单个运行期间由引发剂浓度变化引起的单体的表观顺序的差异。提出了一种反应机制来解释的结果，并推导出三个区域的速率表达式的限制形式。研究的浓度范围为：过硫酸盐，9.5 × 10−4−4.7 × 10− 2 M;硫代硫酸盐，2 × 10−5−2 × 10− 2 M;初始单体，0.05- 1.0 M;温度，30-50°C。在这些范围内，初始速率显示出对过硫酸盐的halforder依赖性和对初始单体浓度的一级依赖性。
Conversion–time data were obtained for the polymerization of acrylamide initiated by the redox couple persulfate–thiosulfate by using a dilatometer. A plot of initial rate as a function of thiosulfate concentration shows a well‐defined maximum and three distinct regions of behavior. In each region the shape of the conversion–time curves demonstrates the differences in apparent order with respect to monomer arising from changes in initiator concentration during an individual run. A reaction mechanism is proposed to explain the results, and a limiting form of the rate expression is derived for each of the three regions. The ranges of concentration studied are: persulfate, 9.5 × 10−4−4.7 × 10−2M; thiosulfate, 2 × 10−5−2 × 10−2M; initial monomer, 0.05–1.0M; and temperature, 30–50°C. Within these ranges the initial rate shows a halforder dependence on persulfate and a first‐order dependence on initial monomer concentration.