3. Paramagnetic probes and labels (spin probe, spin label )

The paramagnetic probe technique consists in incorporating paramagnetic probes into the accessible zones of polymers (amorphous zones), and using EPR spectroscopy to analyze their interactions with the polymer in close relation to the structure . It is based on the remarkable properties of nitroxide radicals.

This technique, widely used in biology, has been put to good use to study polymers and obtain information on :

• the level of penetration and distribution of additives in the polymer structure;...