Effect of pressure on the thermodynamically reversible gelation of 12-hydroxystearic acid in carbon tetrachloride

Abstract

Sir: In a thermodynamically reversible gel, the cross links are known to be caused by secondary forces, such as hydrogen bonds (H bonds), hydrophobic, and electrostatic interactions, rather than by covalent bonds. The gel of 12hydroxystearic acid (CH3(CH2)5CH(OH)(CH2)10COOH) in carbon tetrachloride (CCI4) has been investigated by

On the Measurement of Phase Transition Temperatures in Physical Molecular Organogels

“…1B) provide the values H 300K ≈ −91.1 kJ mol −1 and S ≈ 356.5 J K −1 mol −1 , consistent with the implication of strong hydrogen bonds involving hydroxy and carboxylic groups. A complete discussion and comparison (1,48) with values from other gelling systems is the subject of a different publication (37).…”

Electron paramagnetic resonance study of the physical gelation of a copper complex in cyclohexane

“…One of the purposes of this study deals with the mechanism of cohesion between the constitutive copper complex molecules in the gel network. Very often, in amphiphilic gelifying molecules, hydrogen bonding is implied in the aggregation process [32][33][34]. With the CC complex, the non-polar part is easily identified as being the eight paraffinic chains ; the polar part being the copper diketonate residue.…”

Radical Polymerization and Copolymerization of 12-[(N-Methacryloyl)carbamoyloxy]octadecanoic Acid

“…[1,2] In a previous paper, we found by means of ESR that the longlived propagating polymer radicals are produced in the photopolymerization of di-2-ethylhexyl itaconate with dit-butyl peroxide (DBPO) in the gel formed by 12 HOA and toluene. [3] Postpolymerization proceeds in the polymerization system involving the long-lived polymer radicals.…”

“…The present paper describes the synthesis of 1 and kinetic and ESR results of its polymerization with 2,29-dimethyl azobisisobutyrate (2). Radical copolymerization of 1 was also examined using styrene (St) and acrylonitrile (AN) as comonomers.…”

“…Dependence of the polymerization rate (R p ) on the initiator concentration[2] at 50 8C in acetone; [1] = 1.00 mol/L.…”