phosphate, polycarboxylate, zinc oxide-eugenol and glass-ionomer products and the characteristics of these cements have been examined by several investigators2-5). In our previous investigation6), a decrease in compressive and diametral tensile strength was observed following 12 months immersion in distilled water with zinc phosphate, polycarboxylate and glass ionomer cements for luting, contai...

The stabilization of the dispersed system halloysite nanotubes (HN) obtained by ultrasonic treatment (UST) in aqueous medium stabilizers sodium polynaphthalene methylene sulfonate (S-3) and a synthetic compound based on polycarboxylate ether (MG) is considered. morphology studied. Various mechanisms aggregate stability connected with spatial obstacles to aggregation due action electrostatic, ad...

PolyCarboxylate ether-based superplasticizers (PCEs) are a type of comb-shaped copolymers used as polymeric dispersants in cementitious materials. PCEs have a high degree of dispersity, which limits the suitability of conventional characterization techniques, such as Size Exclusion Chromatography (SEC). Properties of PCEs strongly depend on their molecular structure and a comprehensive characte...

A series of polycarboxylate ether-based copolymers that include acrylic acid, 2acrylamido-2-methylpropane sulfonic acid, and polyethylene glycol-1000 was synthesized and the performance of these copolymers as rheology modifiers in aqueous alumina suspensions was characterized. We discussed the effect of monomer feed ratio and molecular weight on dispersing ability of these copolymers and on ext...

Two polycarboxylate ether copolymers were assessed as superplasticizers (SPs) for hydrated lime pastes modified with two reactive compounds, nanosilica (NS) and ceramic metakaolin (MK). Characterization of the molecular structure of the SPs by Size Exclusion Chromatography, XRD, FTIR and MALDI-TOF (Matrix Assisted Laser Desorption Ionization Time-of-Flight) mass spectrometry was performed. The ...

Abstract Slow-release polycarboxylate superplasticizer was synthetic under room-temperature conditions, a free radical copolymerization reaction occurred the action of redox initiator, and optimal preparation process temperature effect were discussed in detail. The results show that best (EP-15) is: acid-to-ether ratio is 1.89, amount NaH 2 PO 2.27%, appropriate 15-25°C, suitable macromonomer E...

Aim. Physicochemical mechanical and in vitro biological properties of novel formulations of polymeric calcium phosphate cements (CPCs) were investigated. Methods. Monocalcium phosphate, calcium oxide, and synthetic hydroxyapatite were combined with either modified polyacrylic acid, light activated polyalkenoic acid, or polymethyl vinyl ether maleic acid to obtain Types I, II, and III CPCs. Sett...

Marginal leakage was demonstrated in all the inlays at all time intervals with all cements by the use of the isotope Ca45. Gross marginal leakage was observed in all inlays luted with the cyanoacrylate cement at all time intervals. The setting time of this cement is very short, making it difficult to completely seat the inlay before the cement sets. The results of this study indicate that the c...