Mobility, highly efficient polymer

The encounter of two free valences as a result only of diffusion of segments of a macromolecule. Since the radius of segmental diffusion is limited in the real time, this mechanism can be efficient at the high initiation rate and intense mobility of the polymer segments. Under the conditions of polymer oxidation, this mechanism is possible at the chain length close to unity. Some examples are given in Table 13.2. 

A number of approaches have been proposed that reduce the probability of termination by adding reversible termination agents, highly efficient chain transfer agents, or by reducing the diffusional mobility of polymers in poor solvents. The processes developed in recent years can be used to control polymer microstructure and composition with high yield, efficiency, and specificity. The ability to do this has led to a variety of novel materials, properties, and applications. 

Yang and Me (2006) reported that Scheme 1 was better because a high-concentration polymer slug has a higher mobility ratio so that the sweep efficiency was better. When the polymer molecular weight was higher, the advantage of Scheme 1 was more obvious. 

---