Interaction mechanisms between poly(methyl methacrylate) and tricalcium silicate (C3S)

Interaction mechanisms between poly(methyl methacrylate) (PMMA) molecules and tricalcium silicate (C3S) occurring in a C3S‐filled PMMA molecular structure before and after exposure to a simulated 25% geothermal brine solution at 240°C have been investigated by use of thermal analysis, infrared spectroscopy analysis, scanning electron microscopy, and compressive strength tests. For C3S‐filled PMMA samples before exposure to hot brine, it was observed that an interaction between the C3S filler and the CH2 groups in the main chain of the PMMA occurred. After exposure to the hydrothermal environment, indications were that the brine solution induced ionic bonding between the carboxylate anion (COO−) groups in the PMMA and the Ca2+ ions from the C3S. The reaction contributed to improvements in the thermal stability of the PMMA.