Network chain — continued short

From that moment ionic liquids started to be regarded as fluids formed by a polar domain with the structure of a tridimensional network of ionic channels (the polar network), and nonpolar domain(s) arranged as a dispersed nanophase in the case of ionic liquids with relatively short alkyl-side chains and as a continuous one for longer side-chains (Fig. 6). In the systems first analyzed (1-alkyl-methylimidazolium hexafluorophosphate ionic liquids), the butyl side-chain marked the onset of the transition from dispersed nonpolar nanodomains to a bicontinuous nanosegregated system. The nanosegregation is also observed in other families of ionic liquids, the presence of nonpolar side chains both in the cation or in the anion being determinant in the structure of the ionic liquid (Fig. 7). 

In the semidilute regime, the molecules cannot distribute themselves at random over the volume. The polymer concentration fluctuates with a wavelength equal to the correlation length. The system can be seen as a kind of network with mesh size comparable to The network continuously changes conformation due to Brownian motion. Over distances along the polymer chain < , which implies short time scales for molecular motion, polymer sub-chains behave as in a dilute solution interactions between two... 

However, when polysaccharide concentration is very low, even though K-carrageenan exists as aggregated helical chains, such aggrej tes are not enough to occupy all the volume and one obtains a salt solution in which short and fragmented K-carrageenan networks are dispersed in the continuous phase. 

In a more detailed consideration of properties, there is interaction between those dependent on short-range interactions and, in particular, the nature of the repeat unit in the polymer and the constraints imposed by the chain or network structure. For example, the density of a plastic is that expected of an organic substance (0.8 to 1.4 Mg m ). On cooling, the material changes density continuously as it strives towards equilibrium, but is constrained by the polymer structure. This time dependence is characteristic of polymers, particularly thermoplastics, and is a factor of considerable importance in their technology. 

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