Macromolecular and Morphological Evolution of Poly(styrene sulfonate) Complexes with Tetradecyltrimethylammonium Bromide

Abstract

Macromolecular characteristics and morphology of water-soluble complexes between sodium poly(styrene sulfonate) (PSS) and tetradecyltrimethylammonium bromide have been followed as a function of surfactant-to-polymer charge ratio (S/P) to elicit possible changes in the complexation mechanism. As revealed by light scattering, shorter PSS (30 and 150 repeat units) yield multichain complexes while longer PSS (450 and 5000 repeat units) form single-chain species throughout 0 < S/P < 0.9. Irrespective of PSS chain length, the complexes exist in solution in a swollen coil conformation and undergo a compaction with S/P but never collapse into a globule. Even when the free PSS chain is too short to coil (30 repeat units), the complexes adopt a coiled conformation due to multichain aggregation. Morphological changes (manifested by a hypochromic shift in UV spectra of the complexes at S/P < 0.5 and an increase in the local surfactant mobility observed at S/P > 0.5 by ESR) strongly suggest a change in the formation mechanism of the complexes with a transition near S/P = 0.5.

Mesoporous silica core–shell composite functionalized with polyelectrolytes for drug delivery

“…PEI has been used in gene therapy as a delivery agent because it can bind to anionic cell surface [20,21]. Polyanionic polyelectrolyte, such as PSS is a water-soluble, thermal-stable and biodegradable polymer, also commonly used in biological systems [22].…”

Effect of Dilution on the Nonequilibrium Polyelectrolyte/Surfactant Association

“…In a recent work, Popov and co-workers reported very similar hypochromic and batochromic shifts due to the binding of tetradecyltrimethylammonium bromide (TTAB) on NaPSS at constant ionic strength . The authors clearly demonstrated via additional ESR measurements that these results are consistent with the surfactant-binding-induced conformational changes of the PSS molecules, possibly due to the stacking of the aromatic rings.…”

“…To this aim, we chose the sodium poly­(styrenesulfonate) (NaPSS)/dodecyltrimethylammonium bromide (DTAB)/sodium chloride (NaCl) system due to the good solubility of the surfactant and polyelectrolyte and that of their mixtures in highly concentrated NaCl solutions. In addition, the equilibrium phase properties, structures, and surfactant-binding isotherms − as well as the nonequilibrium behavior , has been thoroughly investigated in similar NaPSS/cationic surfactant mixtures. Electrophoretic mobility, turbidity, UV spectroscopy, attenuated total reflection–Fourier transform infrared spectroscopy (ATR–FTIR), small-angle X-ray scattering (SAXS), and surfactant-binding measurements were used to monitor the charge, size, and composition as well as the structure of the formed nanoassemblies.…”

Concentration Dependent Single Chain Properties of Poly(sodium 4-styrenesulfonate) Subjected to Aromatic Interactions with Chlorpheniramine Maleate Studied by Diafiltration and Synchrotron-SAXS

“…The interphase is composed by the remaining charged hydrated polymeric segments, which provides the system stabilization in water, and contains the reversibly bound counterions. Examples of two-phase aggregated systems have been described in the literature formed with PSS and cationic surfactants [ 39 , 81 , 82 , 83 ]. In addition to the study of polyelectrolyte/counterion interactions, DF has been shown to be a useful technique used to study interactions in nanophase-separated systems such nanodroplets of oily core stabilized by anionic and cationic surfactants interacting with the antibiotic oxytetracycline [ 63 ].…”