Synthesis of calcium carbonate particles with carboxylic-terminated hyperbranched poly(amidoamine) and their surface modification

Abstract

Size-controlled CaCO 3 particles were obtained using a carbonate-controlled addition method with a carboxylate-terminated hyperbranched poly(amidoamine) (HYPAM-ONa). The crystalline phase of CaCO 3 particles was determined to be thermodynamically unstable vaterite. The average size of the CaCO 3 particles decreased from 1.3 ± 0.2 to 0.36 ± 0.18 mm with an increase in the incubation time of HYPAM-ONa-Ca 2 þ solution from 3 min to 72 h. Interactions of the CaCO 3 particles in aqueous dispersions with different types of commercially available ionic polymers that is, poly(acrylic acid), poly(sodium 4-styrenesulfonate), poly(diallyldimethylammonium chloride) and poly(arylamine) (PAAM) were studied. Surface coating of the CaCO 3 particles with PAAM, an aqueous dispersion, was successfully achieved by the addition of a specified concentration of the polymer. The surface-coated CaCO 3 particles with gold nanoparticles were obtained by addition of an aqueous solution of gold nanoparticles stabilized with HYPAM-ONa to an aqueous dispersion of the CaCO 3 particles and subsequent addition of HAuCl 4 and formaldehyde as a reducing agent.

Synthesis of imidazole‐terminated hyperbranched polymers with POSS‐branching points and their pH responsive and coordination properties

“…To compare the effect of the POSS branching units, an imidazole‐terminated hyperbranched poly(amidoamine) (HYPAM‐Im) was synthesized with 1‐(3‐aminopropyl)imidazole from a methyl ester‐terminated hyperbranched poly(amidoamine) (HYPAM‐OCH 3 ) by the ester‐amide exchange reaction (Scheme ). M w and M n of HYPAM‐OCH 3 were 8100 and 3800, respectively, based on poly(styrene) standards.…”

“…The first‐generation methyl ester‐terminated POSS‐core poly(amidoamine)‐typed dendrimer (POSS‐OCH 3 ) was prepared according to the literature . Methyl ester‐terminated hyperbranched poly(amidoamine) (HYPAM‐OCH 3 ) was prepared according to our manuscript . All chemicals were purchased from WAKO Pure Chemical Industries (Osaka, Japan).…”

“…7 Methyl ester-terminated hyperbranched poly(amidoamine) (HYPAM-OCH 3 ) was prepared according to our manuscript. 9 All chemicals were purchased from WAKO Pure Chemical Industries (Osaka, Japan).…”

Liquid‐Crystalline Biomacromolecular Templates for the Formation of Oriented Thin‐Film Hybrids Composed of Ordered Chitin and Alkaline‐Earth Carbonate

“…Biomineralization‐inspired methods towards the crystallization of alkaline‐earth carbonate have been studied through biopolymer templates as well as synthetic macromolecular templates . However, molecular precise control processes under mild conditions have not yet been fully achieved for synthetic hybrid materials.…”

“…[13][14][15][16][17] Biomineralization-inspired methods towards the crystallization of alkaline-earthc arbonate have been studied through biopolymer templates [18][19][20][21] as well as synthetic macromolecular templates. [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] However,m olecular precise control processes under mild conditions have not yet been fully achievedf or synthetic hybrid materials. In the present study,w ef ocus on liquid-crystalline (LC)p olymers [38,39] as templates for oriented thin-film hybridsc omposed of ordered chitin and alkalineearth carbonate.…”