| 초록 |
Cationic poly(acrylamide)/silica nanocomposites were prepared by inverse emulsion polymerization using acrylamide and [2-(acryloyloxy)ethyl] trimethylammonium chloride with acryl-grafted silica. The acryl-grafted silica was synthesized through the reaction of fumed silica and coupling agent, such as (3-methacyloxypropyl) trimethoxysilane in toluene. The grafting yield was calculated by TGA analysis and chemical structure was revealed by FT-IR. The acryl-grafted silica was used in inverse emulsion polymerization as a modifier in the amount of 1, 3 and 5wt.%, respectively. The polymerization was carried out with SPAN 80 and TWEEN 85 as a surfactant and azobisisobutyronitrile as an initiator in cyclohexane. The received materials were characterized by FT-IR, FT-Raman, capillary viscometry and the anionic charge demand. The flocculation effects of cationic PAM/silica nanocomposites on aqueous model suspensions with grounded calcium carbonate and talc were studied. |
