Decoupled polymer system

Recently, Souza and co-workers have described a special class of hybrid polyelectrolyte in which ion mobility presents an Arrhenius-type behavior above Tg, suggesting a segmental motion decoupled polymer system. Besides, the ion transport mechanism seems to be governed by thermally active ion hopping with the counter-ion fixed in the hybrid matrix. Based on this concept, many possibilities in solid state chenustry and physics arising within the several areas of elecfroactive and optically active... 

T. A. Hatton, Protein partitioning in two-phase aqueous polymer systems. 5. Decoupling of the effects of protein concentration, salt type, and polymer molecular weight, Macromolecules 1993, 26, 825-828. 

A high ambient temperature conductivity of 10 Scm was measured with LiTFSI dissolved in the P2S5-PEO matrix, i.e, in salt-in-polymer materials. The decoupling of Li+ motions from polymer segmental motions was demonstrated, suggesting that, in certain cases, the transport number for Li+ ions in the phosphorus sulfide-PEO matrix will be much higher than in a typical PEO-based salt-in-polymer system. 

The relaxation with m = 0 approximates to the behaviour of polystyrene in solution. Once the value of n is greater than 5 the motions have become decoupled and the relaxation of the alkane block is almost independent of that of the styrene dimer. This implies that the size of the group in solution that is required for co-operative motion is approximately 5-6 carbon atoms. Similar analysis has been carried out on solid-state relaxations and it is generally found that the ot process involves motion of between 6 and 10 bonds depending on the polymer system. If we consider the co-operative motion of such an element it is possible to envisage that rotation about the backbone can occur without the... 

MAS has only a small influence on the cross-polarization process for rigid polymer systems. In principle, magic-angle spinning reduces the C-H dipolar decoupling, but in order for this averaging process to be efficient, the local coupling must... 

In the simplest polymer systems, for example, melts of low-molecular-weight polymers, motion of individual polymer chains is completely decoupled from neighboring molecules. For these systems, the overall friction coefficient of a single molecule i p is simply obtained by summing over all monomers present in that molecule ... 

---