Soda lime silicate glass and clam Shell act as precursor in synthesize calcium fluoroaluminosilicate glass to fabricate glass ionomer cement with different ageing time

Glass Ionomer Cement (GIC) is produced from an acid-base reaction between various type of alkaline glass powder and polymeric acid. In this research, calcium fluoro-alumino-silicate (CFAS) glass was derived from waste materials such as soda-lime-silica (SLS) glass and clam shell (CS) which are sources of silica and calcium oxide respectively. The polyacrylic acid (PAA) is used to produced mobile carboxyl group and then, react with metal ions on the surface of CFAS glass. To study the influence of ageing time on physical, structural and mechanical properties of GIC, deionized water was used as a soaking medium. The density results increase throughout the ageing time from 7-28 days. The density of GIC at 7 days shows 1.622 g/cm(3) and increasing to 1.789 g/cm(3) at 28 days. However, the molar volume shows the opposite action comparing with the density of GIC. The molar volume shows continue decreasing from 357.63-324.25 cm(3) mol(-1). From the XRD result, GIC was indicating amorphous structure during ageing range between 7-28 days. FTIR analysis shows this phenomenon occurs due to the deformation of Si-OH bonding and formation of Si-O-Si simultaneously in the presence of water which is influence the mechanical strength of GIC. The mechanical properties of GIC increase by ageing time through the compressive test from 42.23-50.28 MPa. Thus, the observed results in this study promise the GIC derived from waste materials have a high potential in dental application due to excellence structural and mechanical properties against ageing. (C) 2020 The Author(s). Published by Elsevier B.V.