Preparation, thermal, spectral and microscopic studies of calcium silicate hydrate - poly(acrylic acid) nanocomposite materials

A series of calcium silicate hydrate (C?S?H)-polymer nanocomposite (C?S?HPN) materials were prepared by incorporating poly(acrylic acid) (PAA) into the inorganic layers of C?S?H during precipitation of quasicrystalline C?S?H from aqueous solution. The as-synthesized C?S?HPN materials were characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), Fourier-transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TG) and differential scanning calorimetry (DSC). The XRD analysis of C?S?HPN materials suggest the intermediate organizations presenting intercalation of PAA within C?S?H and exfoliation of C?S?H. The SEM micrographs of C?S?H, PAA and C?S?HPN materials with different PAA contents exhibit the significant differences in their morphologies. The effect of the material's composition on the thermal stability of a series of C?S?HPN materials along with PAA and C?S?H were studied by TG, DTA and DSC. Three significant decomposition temperature ranges were observed on the TG curves of all C?S?HPN materials.Une s\ue9rie de mat\ue9riaux nanocomposites polym\ue8res-hydrates de silicate de calcium (C-S-H) (C-S-HPN) ont \ue9t\ue9 pr\ue9par\ue9s par incorporation d?acide polyacrylique (PAA) dans les couches inorganiques de C-S-H au cours de la pr\ue9cipitation du C-S-H quasicristallin \ue0 partir d?une solution aqueuse. Les mat\ue9riaux C-S-HPN tels que synth\ue9tis\ue9s ont \ue9t\ue9 caract\ue9ris\ue9s par fluorescence X (XRF), diffraction des rayons X (XRD), microscopie \ue9lectronique \ue0 balayage-spectroscopie de rayons X \ue0 dispersion d?\ue9nergie (MEB-SRXDE), spectroscopie infrarouge \ue0 transform\ue9e de Fourier (SITF), analyse thermo-gravim\ue9trique (TG) et analyse calorim\ue9trique \ue0 compensation de puissance (ACCP). L?analyse par XRD des mat\ue9riaux C-S-HPN donne \ue0 penser que les organismes interm\ue9diaires pr\ue9sentent une intercalation de PAA \ue0 l?int\ue9rieur de C-S-H et une exfoliation de C-S-H. Les micrographies MEB des mat\ue9riaux C-S-H, PAA et C-S-HPN pr\ue9sentant des teneurs en PAA diff\ue9rentes affichent des variations appr\ue9ciables dans leurs morphologies respectives. L?incidence de la composition du mat\ue9riau sur la stabilit\ue9 thermique d?une s\ue9rie de mat\ue9riaux C-S-HPN, de m\ueame que PAA et C-S-H, a \ue9t\ue9 \ue9tudi\ue9e par TG, ATD et ACCP. Trois (3) plages de temp\ue9rature de d\ue9composition significatives ont \ue9t\ue9 observ\ue9es sur les courbes de TG de tous les mat\ue9riaux C-S-HPN.Peer reviewed: YesNRC publication: Ye