Novel Approach to Tailoring Molecular Weight Distribution and Structure with a Difunctional RAFT Agent
Novel Approach to Tailoring Molecular Weight Distribution and Structure with a Difunctional RAFT Agent
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用双官能 RAFT 试剂调整分子量分布和结构的新方法
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
M. Monteiro
中科院分区：
文献类型：
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作者：
Y. Goh;M. Monteiro
这项工作表明，第一次一个单一的RAFT代理（即。例如，双官能的）可以与自由基引发剂结合使用，以获得具有受控聚合速率的所需M-n和PDI。模拟不仅用于验证模型，而且还为我们提供了一个预测工具，以生成其他MWD。它还表明，在这项工作中制备的所有MWD可以通过扩链实验转化为更高的分子量，在端基官能度的控制很少或没有妥协。单官能与双官能SdC（CH 2 Ph）S-端基XPX和XP（其中X）S=C（CH 2 Ph）S-）的比率可以通过简单地改变引发剂AIBN的浓度来控制。重要的是，死聚合物的量极低，并且满足Szwarc（Nature 1956）提出的标准，即为了满足活性要求，由过程中的副反应形成的非官能聚合物物质应该通过分析技术检测不到。此外，这种新的方法将允许合成AB，阿坝，和统计多嵌段共聚物与预定的比例在一锅反应中产生。
This work has demonstrated that for the first time a single RAFT agent (i. e., difunctional) can be used in conjunction with a radical initiator to obtain a desired M-n and PDI with controlled rates of polymerization. Simulations were used not only to verify the model but also to provide us with a predictive tool to generate other MWDs. It was also shown that all the MWDs prepared in this work could be translated to higher molecular weights through chain extension experiments with little or no compromise in the control of end group functionality. The ratio of monofunctional to difunctional SdC(CH2Ph)S- end groups, XPX and XP (where X) S=C(CH2Ph) S-), can be controlled by simply changing the concentration of initiator, AIBN. Importantly, the amount of dead polymer is extremely low and fulfils the criterion as suggested by Szwarc (Nature 1956) that to meet living requirements nonfunctional polymeric species formed by side reactions in the process should be undetectable by analytical techniques. In addition, this novel methodology will allow the synthesis of AB, ABA, and statistical multiblock copolymers with predetermined ratios to be produced in a one-pot reaction.