活化/失活反应对原子转移自由基共聚产物微观结构的影响

EFFECT OF ACTIVATION-DEACTIVATION ON MICROSTRUCTURE OF THE PRODUCT OF ATOM TRANSFER RADICAL COPOLYMERIZATION

提出了一个可以处理原子转移自由基共聚及其产物微结构的模型,采用计算机模拟产生了包括活化/失活反应的ATRcP稳态增长反应链,得到了有关链段分布的信息.模拟发现,含有休眠过程的ATRcP产物与常规的自由基的相比组成结构和序列结构完全一致,即活化/失活反应不影响ATRcP产物的微组成与微序列结构.

A new tetra polymerization model was proposed to handling the atom transfer copolymerization as well as the microstructure of its products. According to this model, computer simulation has been carried on to produce this ATRcP propagation including activation-deactivation process. After filtering two ＂monomers＂ which represent the dormant state of activate units, the chains＇ microstructure was found to be the same as that of the stationary FRcP, and all the values of structure parameters had nothing to do with the dormancy and reactivation probabilities. This conclusion can be supported by the existing experimental results. It is concluded that under stationary conditions, the copolymer＇ s microstructure of the ATRcP is the same as that of the FRcP product, this structure includes the average segment length, composition, triad sequence concentration and segment length distribution.