Mechanism of Polymerization Reaction during the Solidification of Meta-Kaolin Based Mineral Polymer
Products of mineral polymer were prepared from meta-kaolin in this research. The mechanism of polymerization was deduced from the analytical data of XRD, IR, SEM and MAS-NMR. Several stages were produced during the solidification of meta-kaolin-based mineral polymer, that is, firstly, the Si-O-Si, Al-O-Si bonds of the meta-kaolin were broken in the high molar alkaline solution; Parallel to this process, complexes and polymerized species (-Si-O-Na, Al(OH)4-, Al(OH)52-, Al(OH)63-) formed; secondly, aluminosilicate zeolite precursors or precipitates formed; finally, by dehydration, the precursors turned into the non-crystaline phase, in which Q4(2Al) were the main forms of Si element, and tetrahedral aluminum were the main form of Al element in the mineral polymer products cured for 28 days. The experimental results provided a good basis for understanding the formation of mineral polymer.
Yiwang Bao, Li Tian and Jianghong Gong
Y. M. Nie et al., "Mechanism of Polymerization Reaction during the Solidification of Meta-Kaolin Based Mineral Polymer", Advanced Materials Research, Vol. 177, pp. 628-635, 2011