Adsorption of a functionalized polymer from dilute nonaqueous solutions by silica

Abstract

SynopsisThe adsorption of a functionalized styrene-butadiene (SB ) diblock copolymer from toluene solutions at 25OC onto silica of varying particle sizes was studied using thermogravimetric analysis. The copolymer was chemically modified by hydroformylation, and the adsorbate concentration ranged from 0 to 2% by weight. The modified copolymer was adsorbed by the silica particles, but the unmodified copolymer was not. The plateau adsorption was found to increase with silica surface area, and the level of surface coverage ranged from 0.4 to 0.8 mg/m2.

Enhanced Colloidal Stabilization via Adsorption of Diblock Copolymer from a Nonselective ϑ Solvent

“…We measured the surface coverage via thermal gravimetric analysis (TGA). , To prepare a sample, the (bare or coated) particles were settled in an ultracentrifuge, washed with pure solvent, and dried in a vacuum oven. Upon heating, the polymer breaks down fully, well before reaching the highest temperature (800 °C).…”

Thermal analysis

“…These include thermal and mechanical fracture properties (166), dielectric measurements (167), infrared spectroscopy (168,169), electrochemical measurements (170), and mass spectroscopy measurements (171). A TG technique was used to study polymers adsorbed on silica from nonaqueous solutions (172). A combination of IR spectroscopy and thermal analysis was used to examine for possible interactions between poly(vinylpyridines) and acidic polymers (173).…”