膨潤性粘土鉱物の包接作用 (第2報) : 有機変性モンモリロナイトによる非イオン界面活性剤の包接と油性ゲルの生成

概要

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An organophilic-montmollironite (Or-Mon) was prepared by a cation-exchange reaction between sodium-montmollironite (Na-Mon) and dioctadecyldimethylammonium chloride (DODAC). The cation exchange amount of DO-DAC in the Or-Mon was 80 meq/100 g-Na-Mon. This corresponds to the cation exchange capacity (CEC) of Na-Mon. The basal spacing of the Or-Mon was 26.75 Å, which could be explained by the formation of a single layer complex with the alkyl chain lying parallel to the silicate surface of Na-Mon.<BR>The Or-Mon easily adsorbed a nonionic surfactant (SAA) with an HLB value of about 8. The inclusion ratio of SAA to Or-Mon was 0.2/1.0 in weight, and the inclusion compound (SAA/Or-Mon) had 36.78 Å for the basal spacing indicating monolayer adsorption of DODAC into the silicate layer of the Na-Mon interface. SAA/Or-Mon swelled in an oil such as liquid paraffin, resulting in the formation of a gel. The swelling of SAA/Or-Mon may possibly have been induced by entrance of the oil into the interlayer of the SAA/Or-Mon.
社団法人日本油化学会の論文