Adsorption et desorption de l'eau vapeur sur un polymère polyacrylique absorbant

ABSTRACT:We studied an amorphous polymer superabsorbent, able to absorb until 1000 times its weight of water. It is consisted of macromolecular chains, dependent between them by chemical bonds. The swelling of the product in the presence of water gives rise to a polyelectrolytic gel. The chemical analysis of polymer by energy dispersive spectrometry and photoelectrons spectroscopy with a microsounder X showed that the product is homogeneous. It contains carbon, oxygen, and sodium. The measurements of specific surface of the product show that the polymer is nonporous and present a weak surface of about 2.1 m 2 /g. The thermal study of polymer showed that, under the effect of the temperature and with atmospheric pressure, the polymer is degraded only at temperatures higher than 2008C and becomes porous. When the material is heated at higher temperature of 2008C, its surface becomes increasingly porous with also an increase in the size of the pores.

Section: Discussionsupporting

confidence: 83%

Section: Discussionsupporting

confidence: 52%

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Characterization of a superabsorbent polymer

Bakass

Bellat

Bertrand

2007

“…The studied polymer is a superabsorbent polyelectrolyte formed from acrylic acid 3, 8. It is presented in the form of spherical balls (diameters ranging between 10 and 100 μm).…”

Section: Methodsmentioning

confidence: 99%

Absorption and desorption of liquid water by a superabsorbent polymer: Effect of polymer in the drying of the soil and the quality of certain plants

Bakass¹,

Mokhlisse²,

Lallemant³

2001

135

ABSTRACT:In this work, we were interested in the study of the kinetic behavior of the reaction of drying soil representing the Marrakesh region (south of Morocco) in the presence of an superabsorbent polymer. The presence of a polymer in the soil diminished the kinetic drying of the soil, which will have as an application a reduction in water loss in the process of irrigation. The presence of a polymer in the soil enables a complete modification of the kinetic regimes controlling the soil-drying kinetic. We also realized the first study of the behavior of certain selected plants in the melange of a soil and a polymer.

“…The water absorbency of the superabsorbent X10 increased as the temperature increased from 10 to 50°C. This result can be due on the one side, to the purely chemical effect which should promote the intensity of repulsive forces between charged sites (CO

_{2}^{‐}

) by moving the acid‐base equilibrium to ionic form of acid, and on the other side to the increase the flexibility of macromolecular chains, given that the swelling equilibrium is a result of compensation between the repulsive forces and the elasticity of the polymer chains 22, 23. However, when the temperature value ranged from 50 to 90°C, the water absorbency decreased slightly.…”

Section: Resultsmentioning

confidence: 99%

Swelling of superabsorbents polymers in an aqueous medium

Bahaj

Benaddi

Bakass

et al. 2009

The polymers studied are superabsorbents materials. They were synthesized by inverse suspension polymerisation of acrylic acid. The polymers studied, X10 and X5, are different in their degree of ionisation. In fact, our objective was to increase the amount of water that may be stored by the polymer. In this article, we investigated not only the effect of temperature and pH on the satured water absorbency of polymers X10 and X5, but also various swelling behaviours of polymer X10 in different saline solutions. The results show that for temperature ranging from 10 to 90 C, the effect of temperature on the satured water absorbency is rather limited when the superabsorbent is swelled by distilled water. Further, water absorbency of X10 and X5 is strongly affected by the pH value. The results also indicate that saline solutions can weaken the swelling abilities of the polymer X10. Water absorbency of polymer X10 in aqueous chloride salt solutions has the following order: Naall through the range of investigated concentration.