SUDÉRIO, V. M.; http://lattes.cnpq.br/6610614136345367; SUDÉRIO, Vilma Maria.
Resumo:
This work presents an investigation of the catalytic activity of the natural vermiculite (V-N) and that of vermiculite exchanged with chromium (III) (V-Cr) and Cobalt (II) (V-Co) for the aqueous polymerization of metil methacrylate (MMA), using sodium bissulfite as an initiator. The influence of various factors, as the presence of catalysts V-N, V-Cr e V-Co,
calcination temperature of catalysts, catalyst mass, polymerization time, amount of
exchanged chromium and cobalt cations, MMA and NaHSO? concentration and
polymerization temperature, on the rate of polymerization of MMA has been studied. Based on the results obtained the following effects have been observed: 1) the
samples of V-N, V-Cr and V-Co have shown catalytic activity on the aqueous
polymerization reaction of MMA, and V-Cr being more significant. The catalytic
activity was increased with the increase of the amounts of exchanged chromium and
cobalt cations; 2) the increase in the calcination temperature from 100 to 800°C for the
samples of V-Cr and V-Co increased their catalytic activity. However, this increase was
highest for 400°C; 3) the effect of other factors mentioned in the previous paragraph also
showed an increase in MMA conversion. However, for higher values of conversion, due
to covering of the catalyst particles by the polymer formed, deactivation of the active
sites was observed; 4) the catalytic effect of the samples studied is explained on the basis
of mechanism that the presence of transition metal cations on the vermiculite surface
favor the initiator dissociation and thereby more bissulfite radicals are produced which in
consequence increase the polymerization rate of the MMA.