Jc. Ronda et al., Ring-opening polymerization of glycidylic compounds: influence of the glycidylic oxygen in the coordinative mechanism, MACRO CH P, 200(1), 1999, pp. 221-230
A series of oxiranic monomers was synthesized and polymerized by four of th
e most common aluminium-based coordinative initiators: (C2H5)(3)Al/H2O (mol
e ratio 1:0.6) named Vandenberg catalyst, (C2H5)(3)Al/CH3COCH2COCH3/H2O (mo
le ratio 1:1:0.5) named Vandenberg chelate catalyst, (i-PrO)(2) Al-O-Zn-O-A
l(i-PrO)(2) named Teyssie catalyst and (i-PrO)(3)Al/ZnCl2 (mole ratio 1:0.5
) named Price catalyst. They all have a different Lewis acid character. The
influence of a second oxygen (glycidylic or not) on the characteristics of
the polymers and conversions was studied and rationalized on the basis of
a coordinative mechanism. The differences in the polymerization rate and re
gioregularity of the polymers obtained are related to the electronic and co
ordination effects of the neighbouring oxirane substituents. The new polyme
rs were also thermally characterized.