Transient interpenetrating network

When the monomer concentration exceeds c [see Eq. (112) and Fig. 38], the different polymer molecules are no longer separated but interpenetrate each other forming a transient network of lifetime xg. At constant temperature this network structure is characterized by a concentration-dependent correlation length (c), which may be considered as the mean mesh size of the pseudo gel. 

If we now Increase the concentration beyond the colls Interpenetrate more and more and the concentration fluctuations. In the dilute regime taking place over distances of order a. become smaller. A simple picture of the semldllute solution is that of a transient network with an average mesh size between Interchain crossings the quantity Is called the correlation length (see also sec. I.7.7c). A mesh volume of size 5 (also called a "blob" contains N. 

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