Nuclear relaxation and fractal structure of a cross-linked polymer

We have investigated the longitudinal 2 H and 13 C relaxations of methanol and nitromethane adsorbed on poly(4-vinylpyridine) (P4VP) cross-linked by paramagnetic VO 2+ and Cu 2+ ions as well as by diamagnetic Cd 2+ ion. The aim of the proposed method is to gain dynamical as well as structural information on a disordered organic system. Electron spin resonance, scanning electron microscopy, and small-angle X-ray scattering give complementary information on the rigid network (resin) whose nodes are the paramagnetic ions