Abstract
A series of cationic polyacrylamide/bentonite nanocomposites were prepared by inverse emulsion polymerization of acrylamide and [2-(acryloyloxy) ethyl]trimethylammonium chloride (AOTAC) with grafted bentonite. Grafted bentonites were synthesized through a reaction of Na+-bentonite and coupling agents, such as (3-acryloxypropyl) trimethoxysilane (APTMS) and (3-methacyloxypropyl) trimethoxy silane (MAPTMS) in toluene. It has been revealed by TGA analysis that the grafted yields of bentonite were 35.7 and 28.3%, respectively. Grafted bentonite with APTMS was used in inverse emulsion polymerization as a modifier in the amount of 1 ∼ 5wt%. The polymerization was carried out with W/O emulsion by using sorbitan monostearate as a surfactant and potassium persulfate as an initiator. The received materials were characterized by FTIR, capillary viscometry, and the anionic charge demand. The effects of cationic PAM/bentonite nanocomposites on aqueous model suspensions with GCC and talc were studied in both the absence and presence of pulp. It was found that the addition of grafted bentonite in the initial monomer could increase the intrinsic viscosities of nanocomposite solution and enhance the flocculation properties to aqueous suspension; however, their charge demands were reduced.
| Original language | English |
|---|---|
| Pages (from-to) | 415-419 |
| Number of pages | 5 |
| Journal | Appita Annual Conference |
| State | Published - 2010 |
| Event | 64th Appita Annual Conference and Exhibition, Incorporating the 2010 Pan Pacific Conference, Appita 64 - Melbourne, VIC, Australia Duration: 18 Apr 2010 → 21 Apr 2010 |
Keywords
- Bentonite
- Cationic PAM
- Flocculation
- Inverse miniemulsion polymerization
- PAM/bentonite nanocomposite
- Retention
- Silane