Determination of the Macromolecular Dimensions of Hydrophobically Modified Polymers by Micellar Size Exclusion Chromatography Coupled With Multiangle Light Scattering

Abstract

The present work demonstrates that the use of a nonionic surfactant in the mobile phase together with light scattering coupled to size exclusion chromatography (SEC) provides an accurate determination of macromolecular dimensions of hydrophobically modified water-soluble polymer and polyelectrolyte, i.e., weight-average molar mass M(w) and polydispersity I(p). This method, called micellar SEC, is based on the dissociation of the aggregates in aqueous solution and the formation of mixed micelles between the surfactant and the polymer hydrophobic groups. The methodology and its application are presented for synthetic sulfonated polyacrylamides (5 and 20 mol %) modified with three hydrophobic alkyl side groups (C8, C12, and C18) and with Triton X-100 as a nonionic surfactant and are discussed according to the associativity of polymers. The results are compared to those obtained by classical SEC in 0.1 M NaNO(3) and by static light scattering in formamide solution.

Flow of Hydrophobically Modified Water-Soluble-Polymer Solutions in Porous Media: New Experimental Insights in the Diluted Regime

“…The synthesis conditions and the chemical-structure characterizations of the HMWSP and their nonhydrophobic reference WSP investigated in this study have been presented in detail in a previous paper (Dupuis et al 2009) and can be summarized briefl y as follows. The full set of polymers was synthesized according to the micellar copolymerization method reviewed by Candau and Selb (1999), in which surfactant is used above its critical micellar concentration (CMC) to solubilize the hydrophobic monomers into micelles and ensure their incorporation into the hydrophilic backbone.…”

“…These terpolymers, together with a reference sulfonated polyacrylamide WSP, were synthesized using the micellar radical copolymerization technique and extensively characterized using proton-nuclearmagnetic-resonance ( 1 HNMR) spectroscopy and a newly developed micellar-size-exclusion-chromatography (MSEC) technique coupled with multiangle light scattering (MALS) (Dupuis et al 2009). The solution properties of the HMWSP and the reference WSP prepared were then evaluated.…”

Hydrophobically Modified Sulfonated Polyacrylamides for IOR: Correlations between Associative Behavior and Injectivity in the Diluted Regime

“…This section summarizes our previous paper [57], in which we have presented the synthesis conditions and the chemical structure characterizations of the polymers. The polymers were prepared according to the micellar copolymerization method, reviewed by Candau and Selb [58], where the hydrophobic monomers are solubilized within surfactant micelles.…”

“…The molar mass determination involved in particular a newly-developed Micellar Size Exclusion Chromatography (MSEC) technique [57]. The associative behaviors in bulk solution were then examined by DLS and viscosimetry in terms of both hydrodynamic sizes and interchain interactions.…”

“…Weight-average molar masses (M W ) and polydispersity index (I P ) determined by MSEC-MALS [57] are given in Table 1. According to the MSEC-MALS method, these data refer to intrinsic single chains properties, excluding the effects of hydrophobic bonds.…”