Calorimetric investigation of hydrolyzed copolymers of maleic anhydride with butyl and lower alkyl vinyl ethers

Conformational Characterization of A Maleic Acid Copolymer with An Inflexible Side Chain

“…The steric factors of indene compensate for its hydrophobic effects. Such a compensation has previously been shown for an alternating maleic acid copolymer with a-methylstyrene [30]. Also, the values of AG,° are almost the same at three temperatures between 15 and 35°C at / = 0.01.…”

Thermodynamic and Nuclear Magnetic Resonance Study of the Reactions of α- and β-Cyclodextrin with Acids, Aliphatic Amines, and Cyclic Alcohols

“…Although, at present, it does not appear possible to obtain a rigorous, quantitative breakdown of the relative contributions of these various interactions for any specific (ligand + cyclodextrin) reaction, we believe that the following qualitative picture is useful for understanding these complexation reactions. Namely, hydrophobic effects should be typified by negative values of the standard molar heat-capacity change Δ r C ° p and, at or near T = 298.15 K, small positive values of Δ r H ° (<∼10 kJ mol -1 ) and positive values of Δ r S °. − Also, when the ligand is in the cyclodextrin cavity, there is the possibility of attractive van der Waals interactions as well as hydrogen bonding. , These attractive interactions are characterized by negative Δ r H °'s. Using the simple qualitative argument that a ligand that is strongly bound within the cyclodextrin cavity has lost some freedom of motion, one expects it to have a lower entropy than if it were weakly bound within the cavity.…”

“…Namely, hydrophobic effects should be typified by negative values of the standard molar heatcapacity change ∆ r C°p and, at or near T ) 298.15 K, small positive values of ∆ r H°(<∼10 kJ mol -1 ) and positive values of ∆ r S°. [35][36][37][38] Also, when the ligand is in the cyclodextrin cavity, there is the possibility of attractive van der Waals interactions as well as hydrogen bonding. 24,34 These attractive interactions are characterized by negative ∆ r H°'s.…”

Complexation between Poly(maleic acid/octyl vinyl ether) and Poly(vinyl caprolactam) in Aqueous Solution and at the Alumina/Water Interface

“…Most of the studies in the past have involved the members of this family with alkyl groups containing four to ten carbon atoms: they form micelles at low pH and the extent of micellization diminishes with increasing pH as a result of the repulsion between ionized carboxylate groups. This behavior has been established through many studies involving potentiometric (8) and calorimetric (9) titration, viscometry, solubilization of organic dyes, and fluorescence probes (10).…”