Abstract
The reaction below 100 °C of a dehydroxylated clay (metakaolinite: (Al2O3)(SiO2)2(H2O)0.05) suspended in an alkaline sodium silicate solution ((Na2O)(SiO2)1.4(H2O)x) leads to an amorphous glassy aluminosilicate, called in this work “low-temperature inorganic polymer glass” (LTIPG or IPG).
The IPG material is amorphous according to X-ray diffraction (XRD). Its molecular structure is determined by solid state Al and Si magic angle spinning nuclear magnetic resonance (27Al and 29Si MAS NMR) spectroscopy. The polymer consists of SiO4 and AlO4 tetrahedra randomly distributed, with the restriction that no Al-O-Al bonds occur. The Al/Na ratio equals one, the overall cross-link density is almost four, and only few Si-OH groups are present.
The reaction stoichiometry is deduced from differential scanning calorimetry (DSC) and 27Al and 29Si MAS NMR. The inorganic polymer glass is formed by the low-temperature reaction of silicate and metakaolinite in a one to one ratio, according to the following overall reaction equation (Na2O)(SiO2)1.4(H2O) x + (Al2O3)(SiO2)(H2O)0.05 aq.(< 100 °C) →(Na2O)(Al2O3)(SiO2)3.4(H2O) z with z about 0.4.
Mechanical testing shows that the ultimate compressive strength of the inorganic polymer glass corresponds with the stoichiometric silicate/metakaolinite one to one mixing ratio.
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Rahier, H., Van Mele, B., Biesemans, M. et al. Low-temperature synthesized aluminosilicate glasses. JOURNAL OF MATERIALS SCIENCE 31, 71–79 (1996). https://doi.org/10.1007/BF00355128
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DOI: https://doi.org/10.1007/BF00355128