Effect of molybdenum on the structure formation of resorcinol-formaldehyde hydrogel studied by coherent x-ray scattering.
A detailed study on the effect of Mo on the gelation process of resorcinol-formaldehyde systems is presented. The evolution of the system was followed by x-ray photon correlation spectroscopy, which allows in situ investigation of the dynamics as well as of the structural evolution in non-equilibrium processes. The Mo was introduced into the system after a pre-polymerization period (PP), the effect of which was also examined. Our results show that the presence of Mo substantially modifies the gelation process by favoring the growth of large compact clusters with weak bonds between them. However, this effect can be reduced by increasing PP.
European Synchrotron Radiation Facility, BP 220, 38043 Grenoble cedex 9, France. czakkelo@ill.fr
Orsolya
O
Czakkel
Balázs
B
Nagy
Erik
E
Geissler
Krisztina
K
László