Influence of the Polymer Molecular Weight on the Surfactant−Polymer Interactions:  LiPFN−PVP and SDS−PVP Systems

Sesta, B.; D'Aprano, Alessandro; Segre, A.; Proietti, Noemi

doi:10.1021/la970253e

Cited by 33 publications

(38 citation statements)

References 18 publications

(35 reference statements)

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“…The 1 H and 13 C NMR spectra of all PVP-Tn polymers show the characteristic chemical shifts of polyvinylpyrolidone. 22,23 The absence of unpolymerised monomers is confirmed by the lack of chemical shifts corresponding to the vinyl function of VP and VTES. 24 Furthermore, the spectra of the copolymers present additional chemical shifts at 0.5, 1.2 and 3.81 ppm for the 1 H NMR spectrum, and 18.2 and 58.6 ppm for the 13 C NMR spectrum, which correspond to the polymerised VTES monomers.…”

Section: Resultsmentioning

confidence: 90%

New covalent bonded polymer–calcium silicate hydrate composites

et al. 2007

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New covalent bonded polymer-calcium silicate hydrate (C-S-H) composites were prepared. For this purpose, two sets of hydrosoluble copolymers, both containing trialkoxysilane (T-silane) and/or methyldialkoxysilane (D-silane) functions, were synthesized. The addition of these polymers during the synthesis of C-S-H by the sol-gel method allowed us to obtain hybrid materials. The influence of different synthesis parameters, such as the silane content and the nature of the silane functions grafted to the polymer backbone, was studied. Characterisation of the composite materials by thermogravimetry and elemental analysis showed that chemical interaction of polymers and C-S-H is due only to the presence of T-silane functions. 29 Si CP MAS NMR analysis confirmed the existence of covalent linkages between the inorganic silicate chains of the C-S-H crystallites and the T-silane functions. The specific incorporation of these new classes of silane-modified polymers in C-S-H structure may be successfully used in the preparation of new polymer-cement composites with reinforced mechanical properties.

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Section: Resultsmentioning

confidence: 90%

New covalent bonded polymer–calcium silicate hydrate composites

et al. 2007

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“…The effect of polymer molecular weight, temperature, and ionic strength (IS) on polymer–surfactant association has been studied by NMR and surface tension . Surface plasmon resonance spectroscopy was used to follow the kinetics of polymer–surfactant interaction and surfactant binding .…”

Section: Introductionmentioning

confidence: 99%

“…The effect of polymer molecular weight, temperature, and ionic strength (IS) on polymer-surfactant association has been studied by NMR and surface tension. [12][13][14][15] Surface plasmon resonance spectroscopy was used to follow the kinetics of polymer-surfactant interaction and surfactant binding. [ 16 ] Static light scattering combined with viscosity [ 17 ] was used to show that PVP becomes effect on surfactant micelle and hydrophobic dopant systems a topic of potentially broad interest.…”

Section: Introductionmentioning

confidence: 99%

Polymeric Suppression of Dopant‐Enhanced Surfactant Supramicellar Assemblies

Zhu

Reed

2014

Macro Chemistry & Physics

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Certain hydrophobic dopants in surfactant solutions cause massive "supramicellar assemblies" (SAs) to form near the critical micelle concentration (CMC), characterized by a light-scattering peak (LSP). The SAs are large, dynamic, metastable nanostructures composed of surfactant/ dopant. Here, a water-soluble polymer, poly(vinylpyrollidone) (PVP) suppresses SA formation in sodium dodecyl sulfate (SDS) solutions doped with dodecanol, but increases solution instability. Binding of SDS to PVP is stronger than micellization in the LSP regime, refl ected in a decreased SA population and a dramatic reduction and inversion of Rayleigh scattering I R as [PVP] increases, since SAs are much more massive than PVP/SDS association structures. Above the LSP regime, SAs no longer exist and thus I R must re-establish its order, increasing with increasing [PVP]. This causes a cross-over in I R vs [SDS] with an "iso-scattering point," where I R converges at a specifi c [SDS]. Weak LSP suppression is found using dodecyl tri ethyl ammonium bromide (DTAB). Poly(ethylene oxide) (PEO)'s effect is small compared with PVP. electrically charged when SDS binds to it and shows polyelectrolyte-like behavior.To the authors' knowledge, few reports have considered the effect of polymers on the interaction between surfactants and dopants. [18][19][20] Our recent report [ 21 ] shows that certain hydrophobic dopants and surfactants in solution lead to formation of large metastable "supramicellar assemblies" (SAs) in a concentration regime from near the critical micelle concentration (CMC) down to the dopant's solubility limit; i.e., the surfactant micelles do not merely release their hydrophobic payload the CMC, but remain associated with it. This property may help understanding of dispersant, e.g., those used in oil spills, where it is often thought that the surfactant will release the oil below the CMC and re-coalesce, diminishing the effectiveness of the dispersant. The SA shows that is not necessarily the case. Here, it was found that adding PVP to solutions containing SAs can completely suppress the formation of SAs from near the CMC down to the CAC. Many industrial and medical applications involve the use of self-assembly of surfactants, which makes the study of the polymeric

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“…Although the polymer-hydrogenated surfactant systems have been extensively studied, only limited studies of few polymer-perfluorinated surfactant systems have been reported. [24][25][26][27][28][29][30][31] Among which, the PVP-lithium perfluorononanoate (LiPFN) system was systematically examined by using surface tension, viscosity, volume measurement, pyrene fluorescence, calorimetry, and one-pulse 1 H/ 19 F NMR experiments. 27,29 The critical aggregation concentration (cac) of LiPFN in the presence of PVP (1 wt%) was found as 0.9 Â 10 À3 mol kg À1 (z 0.9 mM), which was determined by the surface tension method.…”

Section: Introductionmentioning

confidence: 99%

Intermolecular association and supramolecular structures of PNVF–LiPFN and PVP–LiPFN complexes in the aqueous phase

2010

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A new polymer-surfactant system, the poly(N-vinylformamide) (PNVF)-lithium perfluorononanoate (LiPFN) system, has been studied by a combination of the surface tension method and twodimensional 1 H-19 F heteronuclear Overhauser effect NMR spectroscopy (2D 1 H-19 F HOESY). Using the surface tension method, we found that the critical aggregation concentration (cac) of LiPFN in the presence of PNVF is ca. 2 mM. In addition, the association behavior between LiPFN and PNVF is similar to that between poly(vinylpyrrolidone) (PVP) and LiPFN. The supramolecular structure of the PNVF-LiPFN complex in the aqueous phase is revealed by means of the 2D 1 H-19 F HOESY experiment. On the basis of the intermolecular cross-relaxation between the PNVF protons and the LiPFN fluorines, we could conclude that the PNVF chain do penetrate into the LiPFN aggregate. The semi-quantitative analysis of the internuclear distance indicates that the PNVF chain is not located at the center core of the LiPFN aggregate, but the PNVF chain thread itself through the surface shell of the LiPFN aggregate instead. PNVF protons are nearest to the fluorines next to the carboxyl group, suggesting that the interaction between PNVF and LiPFN is mainly due to the dipole-ionic attraction. Moreover, we have reinvestigated the supramolecular structure of PVP-LiPFN complex and have found that the PVP chain also penetrates into the LiPFN aggregate. In contrast with the PNVF-LiPFN complex, the PVP chain in the PVP-LiPFN complex is rather close to the middle part of the LiPFN molecules which constitute the polymer-bound aggregate. This indicates that the formation of PVP-LiPFN complex involves more or less fluorophilic interactions.

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Influence of the Polymer Molecular Weight on the Surfactant−Polymer Interactions: LiPFN−PVP and SDS−PVP Systems

Cited by 33 publications

References 18 publications

New covalent bonded polymer–calcium silicate hydrate composites

New covalent bonded polymer–calcium silicate hydrate composites

Polymeric Suppression of Dopant‐Enhanced Surfactant Supramicellar Assemblies

Intermolecular association and supramolecular structures of PNVF–LiPFN and PVP–LiPFN complexes in the aqueous phase

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