Effects of structural variables on AUL and rheological behavior of SAP gels

被引：0
|
作者：
Ramazani-Harandi, M.J. [1 ]
Zohuriaan-Mehr, M.J. [1 ]
Yousefi, A.A. [1 ]
Ershad-Langroudi, A. [1 ]
Kabiri, K. [1 ]
机构：
[1] Iran Polymer and Petrochemical Institute (IPPI), P.O. Box 14965-115, Tehran, Iran
来源：
Journal of Applied Polymer Science | 2009年 / 113卷 / 06期
关键词：
The swelling properties of superabsorbent polymers (SAPs) under real conditions are extremely important for selecting the material suitable for a. given application; e.g. feminine napkin; or agriculture. This new practical research represents deeper synthetic and physicochemical studies on the structure-property relation in acrylic SAP hydrogels and composites. Thus; the values of saline-absorbency under load (AUL; a measurable simulation of the real circumstances of SAP applications; at pressures 0.3-0.9 psi) were measured for the SAP or SAP composite samples prepared under different conditions; i.e. type and content of crosslinker; type and concentration of initiator; percentage of inorganic filler (kaolin); and type and percentage of porosity generators. The samples were subsequently used to determine the rheological and morphological characteristics. Dynamic storage modulus (G') measurements were carried out at constant strain; in. a wide range of frequency. Linear correlations were frequently found to be active between AUL and G data over the rubber-elastic plateau. Thus; for a given SAP: AUL = KtotalG' + C. The coefficient k total is a function of (nature and content of crosslinker; initiator; inorganic component; particle morphology; etc.); Therefore; the easily measured AUL values could be simply correlated to the main synthesis variables and molecular structure of SAP gels through a rheological material function (G'). © 2009 Wiley Periodicals; Inc;
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页码：3676 / 3686
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