Direct osmotic pressure measurements on partially neutralized poly(acrylic acid) gels

1993 ◽  
Vol 3 (6) ◽  
pp. 927-936
Author(s):  
C. Weill ◽  
T. Lachhab ◽  
P. Moucheront
Keyword(s):  
Light Scattering ◽  
Acrylic Acid ◽  
Osmotic Pressure ◽  
Polymer Concentration ◽  
Theoretical Models ◽  
Experimental Device ◽  
Pressure Measurements ◽  
Ionization Degree ◽  
Good Agreement ◽  
Poly Acrylic Acid

We present a new experimental device to measure the osmotic pressure in gels. The system has been tested on partially neutralized poly(acrylic acid) gels. The variation of the osmotic pressure with polymer concentration, Φ, and ionization degree, α, is linear, provided that α is not too high (I.e. the counterions do not condense on the chains). These results are in good agreement with theoretical models and with compressibility measurements obtained by light scattering experiments. The very charged gels are also studied, and the results are discussed in the frame of existing theories and experiments.

Light scattering study of partially ionized poly(acrylic acid) systems : comparison between gels and solutions

1991 ◽  
Vol 1 (6) ◽  
pp. 637-650 ◽  
Author(s):  
A. Moussaid ◽  
J. P. Munch ◽  
F. Schosseler ◽  
S. J. Candau
Keyword(s):  
Light Scattering ◽  
Acrylic Acid ◽  
Scattering Study ◽  
Partially Ionized ◽  
Poly Acrylic Acid

The Structure of Neoprene. I. The Molecular-Weight Distribution of Neoprene Type GN

1949 ◽  
Vol 22 (3) ◽  
pp. 680-689
Author(s):  
W. E. Mochel ◽  
J. B. Nichols ◽  
C. J. Mighton
Keyword(s):  
Molecular Weight ◽  
Natural Rubber ◽  
Osmotic Pressure ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Distribution Curve ◽  
Pressure Measurements ◽  
Dilute Solution ◽  
Molecular Weights ◽  
Good Agreement

Abstract Polychloroprene rubber (Neoprene Type GN) was fractionated by partial precipitation from dilute solution in benzene and the fractions were examined both osmotically and viscometrically in benzene solutions. The molecular-weight distribution curve for Neoprene Type GN based on osmotic pressure measurements shows a pronounced maximum at 100,000, but has a long extension to molecular weights of over one million, indicating the presence of branched or cross-linked material which is still soluble. The uniformity is somewhat less than that of sol natural rubber, while in shape the Neoprene distribution curve resembles more closely that of peptized natural rubber than fresh sol rubber. Observed variations in the slopes of the π/c vs. c and the ηsp/c vs. c curves also indicate the presence in solution of complex, branched and (or) cross-linked molecules. Calibration of the intrinsic viscosity-molecular weight relationship by osmotic pressure measurements gave good agreement with the equation: [η]=KMa, where K=1.46×10−4 and a=0.73.

scholarly journals Recombination of Poly(Acrylic Acid) Radicals in Acidic Aqueous Solutions: A Pulse Radiolysis Study

2021 ◽  
Vol 11 (21) ◽  
pp. 10142
Author(s):  
Małgorzata Matusiak ◽  
Sławomir Kadłubowski ◽  
Piotr Ulański
Keyword(s):  
Acrylic Acid ◽  
Aqueous Solutions ◽  
Ph Dependence ◽  
Polymer Concentration ◽  
Second Order ◽  
Order Kinetic ◽  
Initial Number ◽  
Linear Charge Density ◽  
Kinetics Of ◽  
Poly Acrylic Acid

Carbon-centered radicals have been randomly generated on the chains of poly(acrylic acid), PAA, the simplest synthetic anionic polyelectrolyte, by pulse-irradiating its dilute, oxygen-free aqueous solutions by 6 MeV electron beam. In some experiments, oligo(acrylic acid), OAA, and propionic acid, PA, were used as PAA models. Recombination kinetics of PAA radicals has been followed by fast spectrophotometry. A strong pH dependence of radical lifetime on pH, and thus on the linear charge density due to deprotonated carboxylate groups, has been confirmed, while a weaker amplitude of pH dependence was observed for OAA and PA. Decay kinetics of PAA radicals in the protonated state, at pH 2, have been studied in some detail. At moderate doses of ionizing radiation, resulting in a moderate average initial number of radicals per chain, ZR0, the decay can be satisfactorily described by a second-order kinetic model, but a somewhat better fit is obtained by using a dispersive kinetics approach. While for a constant polymer concentration the reciprocal half-lives are proportional to the initial radical concentrations, such a data series for different PAA concentrations do not overlap, indicating that the overall radical concentration is not the decisive factor controlling the kinetics. Arranging all data, in the form of second-order rate constants, as a function of the average initial number of radicals per chain allows one to obtain a common dependence. The latter seems to consist of two parts: a horizontal one at low ZR0 and another one of positive slope at higher ZR0. This is interpreted as two kinetic regimes where two distinct reactions dominate, intermolecular and intramolecular recombination, respectively. Comparison of the low ZR0 data with calculations based on the translational diffusion model indicate that the latter is not the rate-controlling process in intermolecular recombination of polymer radicals; segmental diffusion is the more likely candidate.

Structural properties of partially charged poly (acrylic acid) gels as probed by light scattering

1994 ◽  
Vol 83 (1) ◽  
pp. 183-192
Author(s):  
Sauveur J. Candau ◽  
Rachid Skouri ◽  
François Schosseler ◽  
Jean-Pierre Munch
Keyword(s):  
Light Scattering ◽  
Acrylic Acid ◽  
Structural Properties ◽  
Poly Acrylic Acid

Bending Characteristics of Electrical Responsive Poly(vinyl alcohol)/Poly(acrylic acid) Semi-Interpenetrating Polymer Network Hydrogel under DC Electric Field

2009 ◽  
Vol 79-82 ◽  
pp. 1595-1598 ◽  
Author(s):  
Wei Wei Cui ◽  
Li Zhu Liu ◽  
Xing Song Zhu
Keyword(s):  
Acrylic Acid ◽  
Osmotic Pressure ◽  
Vinyl Alcohol ◽  
Polymer Network ◽  
Interpenetrating Polymer Network ◽  
Poly Vinyl Alcohol ◽  
Gradient Theory ◽  
Stimuli Responsive ◽  
Interpenetrating Networks ◽  
Poly Acrylic Acid

Semi-Interpenetrating networks (SIPN) hydrogel composed of poly (acrylic acid) (PAA) and poly (vinyl alcohol) (PVA) was prepared by free radical solution polymerization. The SIPN was characterized by Fourier transform infrared spectroscopy (FTIR). The electric stimuli responsive characteristics were investigated. The hydrogel bent toward the anode initially, altered the bending direction for two times and bent toward the anode ultimately when it was placed in a 0.1 M NaCl aqueous solution under non-contact DC field. For interpreting the special deformation the osmotic pressure curves according to Shiga’ osmotic pressure model were simulated and the pH gradient theory was applied to explain the final direction.

scholarly journals Osmotic Engine: Translating Osmotic Pressure into Macroscopic Mechanical Force via Poly(Acrylic Acid) Based Hydrogels (Adv. Sci. 9/2017)

2017 ◽  
Vol 4 (9) ◽  
Author(s):  
Lukas Arens ◽  
Felix Weißenfeld ◽  
Christopher O. Klein ◽  
Karin Schlag ◽  
Manfred Wilhelm
Keyword(s):  
Acrylic Acid ◽  
Osmotic Pressure ◽  
Mechanical Force ◽  
Poly Acrylic Acid

scholarly journals Light Scattering Study of the Antibody-Poly(methacrylic acid) and Antibody-Poly(acrylic acid) Conjugates in Aqueous Solutions

2001 ◽  
Vol 1 (4) ◽  
pp. 157-163 ◽  
Author(s):  
Sergey V. Kazakov ◽  
Vladimir I. Muronetz ◽  
Maria B. Dainiak ◽  
Vladimir A. Izumrudov ◽  
Igor Yu. Galaev ◽  
...  
Keyword(s):  
Light Scattering ◽  
Acrylic Acid ◽  
Aqueous Solutions ◽  
Methacrylic Acid ◽  
Scattering Study ◽  
Poly Acrylic Acid
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