Investigation of Cross-Linked Polymer Systems by PL

Both polyelectrolyte networks and networks of other chemical structures are widely used owing to their peculiar properties (hi effectiveness of bonding of 

TaUe 17. Relaxation times for PMMA with covalent luminescent junctkms in various solvents at 25 °C (%ej = 0.38 cP) M = molecular weight of the linear fragment 

Solvent fragment Unear PMMA PMMA with covalent junctions for linear PMMA (M = 28 X li in solution 

PMMA chain. This shows that the local density of the units near the junction increases. The influence of the increase in the Icwal density of units on the mobility of the junction becomes more pronounced as the thermo namic strength of the solvent for PMMA decreases and as the molecular weight of the polymer chain increases (Table 17). 

A similar character of changes in the IMM of cross-linked PMAA shows that, in linear fragments of the PMAA polymer network at a = 0, local sequences with an inner structure also appear, but the cooperative increase in IMM determined by their de- 

Intermacromolecular hydrogen bonds, interactions of non-polar groups in water, and electrostatic interactions between mactomolecules lead to the formation of polymer complexes consisting of cooperatively bonded continuous sequences of monomer units of complementary polymer chains or to tlw formation of poly- 

High sensitivity of the IMM of the polymer to changes in intramacromolecular interactions of various types (specific or Van der Waals interactions, etc.) permits to make use of the relaxation properties of the polymer for studyb intermacromolec-ular interactions in polymer-polyn r comjdexes (PC). A com rative investigation of the IMM of macromolecules constituting PC and single macromolecules of each of its components has been carried out for a number of PC 31-133) method 

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