Poly(acrylic acid): A Combined Analysis with Field‐Flow Fractionation and SAXS

Knappe, Patrick; Bienert, Ralf; Weidner, Steffen M.; Thünemann, Andreas F.

doi:10.1002/macp.201000163

Cited by 7 publications

(5 citation statements)

References 25 publications

(32 reference statements)

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“…First, we analyzed P 2 ( q ) for pure NaPAA267 and NaPAA323 in 100 mM aqueous NaCl (shown by red circles in panels a and b in Figure ) by the wormlike cylinder model, characterized by the contour length L m , the Kuhn segment length λ m –1 (stiffness parameter), and the cylinder diameter d . The fitting results are indicated by red solid curves in the panels, and the three parameters, h m (≡ L m / n ), λ m –1 , and d obtained by the fitting were 0.26 ± 0.01 nm, 3.3 ± 0.3 nm, and 1.5 ± 0.1 nm, respectively; the chain stiffness is fairly comparable with the previously estimated values …”

Section: Resultsmentioning

confidence: 99%

Complex Formation of Collagen Model Peptides with Polyelectrolytes and Stabilization of the Triple Helical Structure

et al. 2011

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Small-angle X-ray scattering (SAXS) measurements were made for three collagen model peptides, H-(Gly-Pro-4-(R)-Hyp)9-OH, H-(Pro-4-(R)-Hyp-Gly)9-OH, and H-(Gly-4-(R)-Hyp-4-(R)-Hyp)9-OH with or without sodium polyacrylate (NaPAA) in 20 mM and 100 mM aqueous NaCl at 15 °C and 75 °C. At 15 °C, almost all triple helical peptides form a complex with NaPAA when the molar ratio of acrylic acid unit to peptide molecules is larger than 10 whereas they are molecularly dispersed at 75 °C. Furthermore, the attached triple helices appreciably extend the main chain of NaPAA, and the radius of gyration for the complex is at most twice larger than the single NaPAA chain. Circular dichroism measurements demonstrated that the complexation noticeably stabilizes the triple helical structure and the melting midpoint temperature Tm is 2 -10 °C higher than that for the solution without NaPAA.This stabilization was also observed for negatively charged sodium carboxymethylamylose and sodium hyaluronate as well as for positively charged poly(vinyl ammonium) chloride, but no appreciable stabilization of the triple helical structure by the polyelectrolytes was observed for an end-capped peptide Ac-(Gly-Pro-4-(R)-Hyp)9-NH2. These results indicate that the complex formation is due to the electrostatic attraction between polyelectrolytes and the opposite charges at the end of uncapped triple helical peptides.

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Section: Resultsmentioning

confidence: 99%

Complex Formation of Collagen Model Peptides with Polyelectrolytes and Stabilization of the Triple Helical Structure

et al. 2011

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“…Among weak polyelectrolytes, polyacrylic acid (PAA) has a specific interest since it is widely used in household and industry products as a scale inhibitor or thickening agent [3,4]. In addition, PAA can be seen as a model for natural organic polyacids which are at play in various environmental processes, such as the facilitated transport of heavy metals or radionuclide ions [5].…”

Section: Introductionmentioning

confidence: 99%

Ionization of short weak polyelectrolytes: when size matters

Dolce

Mériguet

2016

Colloid Polym Sci

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The ionization of short weak polyelectrolytes in dilute solutions is investigated by 1 H Nuclear Magnetic Resonance (NMR). The increase of the pH of the medium causes both the ionization of the polyacids and, due to the intramolecular repulsions, the swelling of the chains. As a result, a noticeable effect of the pH change on the NMR chemical shift δ , and on the self-diffusion coefficient D is observed. The ionization of the polyelectrolyte occurs at higher pH as the length of the chain increases. The variation of the selfdiffusion coefficient with pH exhibits the opposite dependence on the length of the chain. However, no detectable effect of the length of the polyelectrolyte chain on the evolution of the chemical shift with pH is observed. These apparent contradictions are examined to clarify the impact of the chain length on the polyelectrolyte properties, and the counterion role in the ionization process.

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“…For example, the volume per cetyltrimethylammonium bromide (CTAB) molecule υ CTAB estimated from its partial molar volume V M ≈ 230 cm 3 /mol for the very small CTAB concentration c CTAB = 0.0006 mol/L in water gives υ CTAB = V M / N A ≈ 0.38 nm 3 ( N A is the Avogadro number). The volume occupied by the Kuhn segment of a poly(acrylic acid) molecule can be found as υ PAA = l K M /( LN A ρ PAA ), where the values of the contour length L , molar mass M , and Kuhn segment length l K ≈ 1.65 nm were determined experimentally . The density ρ PAA (mass to volume ratio) of pure poly(acrylic acid) can be estimated from the standard characteristics of the solution (the density ρ = 1.150 g/mL for 35 wt % in water) available from Merck.…”

Section: Resultsmentioning

confidence: 99%

Surfactant-Induced Patterns in Polymer Brushes

Larin

Govorun

2017

Langmuir

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The properties of surfaces with grafted macromolecules are determined by a fine structure of the macromolecular layer, whereas the mixtures of macromolecules with surfactants are very rich in structure types. Using the scaling mean-field theory, we consider the self-assembly in polymer brushes into various patterns induced by interactions with low-molecular surfactants. The interaction energies of the parts of a surfactant molecule with the polymer units are assumed to be greatly different. With increasing the grafting density, the formation of lamellae perpendicular to the grafting plane, a continuous layer with oblong or round pores, or a homogeneous brush is predicted. The driving force of the pattern formation is a gain in the interaction energy of surfactant molecules oriented at the lateral surfaces of lamellae or pores. The process of pore formation in a homogeneous brush caused by a temperature change at definite grafting densities is described as the first-order phase transition. It is accompanied by a stepwise extension of the brush and by orientational ordering of surfactant molecules. The transitions between the other patterns are of the second order. The thickness of lamellae and the distance between pores are approximately twice the surfactant molecule size except for the extremely high grafting densities. The diagrams of brush patterns are presented and discussed.

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Poly(acrylic acid): A Combined Analysis with Field‐Flow Fractionation and SAXS

Cited by 7 publications

References 25 publications

Complex Formation of Collagen Model Peptides with Polyelectrolytes and Stabilization of the Triple Helical Structure

Complex Formation of Collagen Model Peptides with Polyelectrolytes and Stabilization of the Triple Helical Structure

Ionization of short weak polyelectrolytes: when size matters

Surfactant-Induced Patterns in Polymer Brushes

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