Amphiphilic copolymers with increased affinity for substrates

Abstract

The copolymers of methyl quaternized 2‐dimethylaminoethyl acrylate and styrene, 2‐vinyl naphthalene, acrylic acid iso‐octyl ester, or acrylic acid n‐butyl ester have been prepared. Studies were made of the binding of a “binding probe,” methyl orange, by the copolymers in aqueous solution. The first binding constants and the thermodynamic parameters in the course of the binding were evaluated. Furthermore, the intensity of fluorescence of a hydrophobic fluorescent probe, 2‐p‐toluidinylnaphthalene‐6‐sulfonate, in the presence of these polymers was investigated. In addition, the fluorescence spectra of monomer and excimer emissions of the polymers with aromatic residues were measured. The excimer/monomer fluorescence intensity ratio was studied in the presence of various additives such as methyl orange, urea, methanol, and NaCl to gain an insight into the nature of microdomains in the polymer. The nature and phenomena of dye binding and hydrophobic fluorescent probe binding with the polymers are discussed. © 1993 John Wiley & Sons, Inc.

Fluorescence studies of pyrene-labelled, pH-responsive diblock copolymer micelles in aqueous solution

“…Clearly, ht f i decreases monotonously with increasing pH, from 127.8 ns to 70.5 ns. This is contrary to expectation: previous fluorescence measurements using a methyl orange probe confirmed [54] that the homopolymer, PDMA, changes from an extended structure at low pH to a compact coil at high pH [55,56]. From our experience of the conformational behaviour of smart polymers using a pyrene probe [8,15,49,50], and with reference to the literature [1,4,6], it was expected that the fluorescence lifetime of the label should increase assuming that the DMA component induces a chain collapse in the block copolymer.…”

Improvement of paint effluents coagulation using natural and synthetic coagulant aids

“…Colour removal is mainly attributed to flocculated decolourization process. Through energetic and hydrophobic interactions, the dye molecules intensively bind with the flocculant [26,27] leading finally to colour removal.…”

Preparation of poly(ethylene glycol)-modified poly(amidoamine) dendrimers with a shell of hydrophobic amino acid residues and their function as a nanocontainer

“…PAMAM G4 dendrimer has 64 terminal primary amino groups. interactions under equilibrium conditions [7,16,17]. The Klotz equation is as follows:…”

“…where r, k, C and n indicate the number of moles of bound RB per 1 mol of dendrimer, the intrinsic binding constant, the concentration of free RB and the number of binding sites of the dendrimer [16,17].…”

“…For that purpose, we performed titration experiments by adding increasing amounts of dendrimer to RB at pH 7.4 and 5.0. The results were analyzed using a Klotz plot, which is widely used to study host-guest interactions [7,16,17]. As presented in Fig.…”