Swelling of TMA(tetramethylammonium)- and HDP(hexadecylpyridinium)-montmorillonites in water and toluene media: influence of the type montmorillonites

Abstract

Organo-clays were prepared by exchange cations of the montmorillonite with tetramethylammonium (TMA)- and hexadecylpyridinium (HDP)-chloride. Two different montmorillonite types were studied. Two amounts of each organic substances (1 and 4 cation exchange capacity times of montmorillonite) were contacted with each montmorillonite clay for 1 and 24 h. The solids were characterized by X-ray diffraction and swelling index. The swelling was measured in water and toluene media. The structural characteristics of montmorillonites changed after organo treatment and showed different behaviour in water and toluene media. The type of montmorillonite, the organic cation intercalates (TMA, HDP) and condition of treatment influenced in the different swelling in water and toluene media

Pre‐dispersing of montmorillonite nanofiller: Impact on morphology and performance of melt compounded ethyl vinyl acetate nanocomposites

“…Therefore, we have postulated that pre‐dispersing of the nanoclay in liquid medium prior to melt compounding with polymers may weaken the tactoid bonding and further facilitate the exfoliation and dispersion of the nanoclay during the melt compounding process. Previous researches proved that the swelling of the organoclays can be achieved by dispersing them in both polar and non‐polar molecules, as their inter‐galleries is sensitive to the absorption of both types of ancillary molecules . The non‐polar organic solvents such as toluene can be efficiently solubilized within the inter‐galleries of the organo‐MMT due its polarity matching with the organic surfactant used to surface modify the nanoclay.…”

“…The non‐polar organic solvents such as toluene can be efficiently solubilized within the inter‐galleries of the organo‐MMT due its polarity matching with the organic surfactant used to surface modify the nanoclay. The polar liquid such as water can induce dipoles at the silicate surface, thereby providing driving force for the swelling process through the dipolar repulsion . However, literatures suggest that there was no research concerning the benefits and effects of polar and non‐polar pre‐dispersing medium on the morphology and properties of melt compounded polymer nanocomposites thus far.…”

N2 and CO2 Adsorption by TMA- and HDP-Montmorillonites

“…Tetramethylammonium (TMA) and hexadecylpyridinium (HDP) cations were used to prepare organomontmorillonites as it has been informed in a previous paper 9 . Aqueous solution of TMA chloride or HDP chloride salts were added to montmorillonite suspensions and allowed to stand for 4 and 24 hours.…”

“…The montmorillonite clays are recognized as good adsorbents due to their ability to exchange interlayer cations for charged organic or metal cations in solution. The montmorillonite can be converted into organo-montmorillonite and it could be effective for adsorption organic compounds [1][2][3][4][5][6][7][8][9] . Yang and Baksh 10 and Yang and Cheng 11 started studies of gas adsorption by pillared clays.…”

Effect of organic modifier type of montmorillonite on the poly (butyl acrylate-co-methyl methacrylate)/montmorillonite nanocomposite

“…According to the studies in the literature, achievement of a good OMt dispersion in monomer prior to polymerization is strongly related with compatibility between Mt and the monomer [26,27]. Some researchers claimed that interaction between OMt and organic medium can be predicted by swelling degree of OMt in the organic medium [23,[28][29][30].…”