Effect of polyfunctional chain transfer agents on molecular weight distribution in free-radical polymerization, 2. The case C ≤ 1†
Effect of polyfunctional chain transfer agents on molecular weight distribution in free-radical polymerization, 2. The case C ≤ 1†
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多官能链转移剂对自由基聚合中分子量分布的影响，2. 情况 C ≤ 1†
DOI：
10.1002/mats.1994.040030117
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发表时间：
1994
影响因子：
1.4
通讯作者：
M. Farina
中科院分区：
文献类型：
--
作者：
C. Yuan;M. Farina
本文研究了转移常数C ≤ 1的多官能团链转移剂对聚合物分子量分布的影响。用动力学和统计方法推导了聚合物的数均聚合度、重均聚合度和分散指数的解析表达式。分子量分布的表达式只能通过统计方法获得。一些数值例子的依赖性的分布参数的功能的转移剂f和转移常数的说明。发现链转移常数存在一个临界值，该临界值允许在整个聚合过程中合成DPw/DPn约等于2的线性（f = 2）或支化聚合物（f > 2）。
In this part of the series, the influence of polyfunctional chain transfer agents with transfer constant C ≤ 1 on the molecular weight distribution was studied. The analytical expressions for the number- and weight-average degree of polymerization, and dispersion index were derived by kinetic and statistical methods. The expression for the molecular weight distribution can only be obtained by statistical methods. Some numerical examples on the dependence of distribution parameters as a function of the functionality of transfer agents f and transfer constants are illustrated. A critical value of the chain transfer constant was found to exist, which permits the synthesis of linear (for f = 2) or branched polymers (f > 2) with DPw/DPn approximately equal to 2 during the entire course of the polymerization.