Analysis of New Biodegradable Amphiphilic Water-soluble Copolymers with Various Hydrophobe Content by Multi-angle Light Scattering on Line with Flow Field Flow Fractionation

Buildup of Multilayers Based on Amphiphilic Polyelectrolytes

“…This technique is described in detail elsewhere. 22,27 Briefly, F4 is a separating technique in which the separation takes place in a thin, open channel through which the sample is transported by a laminar flow of carrier showing a parabolic flow profile. An external solvent flow applied perpendicularly to the channel flow partitions the various components of the sample into regions of different velocities.…”

“…The macromolecular characteristics of the hydrophobically modified CMP's in aqueous solution were investigated by using a symmetrical flow field−flow fractionation (F4) system coupled on-line with multiangle laser light scattering (MALLS) and differential refractive index (DRI) detectors. This technique is described in detail elsewhere. , Briefly, F4 is a separating technique in which the separation takes place in a thin, open channel through which the sample is transported by a laminar flow of carrier showing a parabolic flow profile. An external solvent flow applied perpendicularly to the channel flow partitions the various components of the sample into regions of different velocities.…”

“…The simultaneous measurements of the light scattering intensity and the concentration of the different eluted fractions allow us to compute the molar mass distribution and the average molar mass of the sample. Unlike the size exclusion chromatography (SEC), the open channel geometry of F4 without stationary phase is particularly suited to the fractionation of amphiphilic polymers which show a complex associating behavior in solution. ,, Experimentally, we used an universal F4 fractionator model F-1000 from PostNova (Munich, Germany) piloted by Flow 160 software and coupled on-line with a DAWN-F (DSP) photometer from Wyatt Technology Inc. (Santa Barbara, CA) and a differential refractive index ERC 7515A detector from Erma CR Inc. (Tokyo, Japan). The carrier used was 0.1 M LiNO 3 + 0.02% NaN 3 filtered through a 0.22 μm Millipore membrane and continuously degassed with Gastorr 154 from Flom (Tokyo, Japan).…”

Amphiphilic polysaccharides. Evidence for a competition between intra and intermolecular associations in dilute system

“…The CMP-33-C 8 and CMP-45-C 8 are the most compact samples. By taking into account this fact and their large content in hydrophobic chains, it can be assumed that the conformation of such polymer in aqueous solution involve the presence of alkyl groups mainly inside the coil in order to limit contacts between octyl chains and water [4]. From the viscosity and F4/MALLS data a plausible explanation could be proposed concerning the conformation of the C 8 modified CMP series.…”

Physicochemical characterization of the thermo-induced self-assembly of thermo-responsive PDMAEMA-b -PDEGMA copolymers

“…To the best of our knowledge, AF4 is rarely used for the analysis of polymers showing LCST behavior . Nowadays, a multiangle laser light scattering (MALLS) or a DLS detector is hyphenated to AF4 to obtain independent information about molar mass, radius of gyration ( R g ), hydrodynamic radius ( R h ), dispersity ( Đ ), or shape …”