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技术资料/正文

Physicochemical Properties of Calcium Polycarbophil a Water-absorbing Polymer

195 人阅读发布时间:2021-04-02 08:58

 
Abstract
The physicochemical properties of calcium polycarbophil were examined.Calcium polycarbophil  was decalcified rapidly under acidic conditions  affording polycarbophi l. Polycarbo­phil absorbed about 10 times its own weight of water under acidic conditions but the swelling ratio markedly increased at above pH 4.0 and reached 70 times the initial weight under neutral conditions. The swelling ofpolycarbophil was not affected by non-ionic osmolarity but was affected by ionic strength showing a decrease with increase of ionic strength. Monovalent metal ions such as sodium and potassium ions in gastrointestinal fluid did not reduce the equilibrium swelling of polycarbophil  but  divalent  ions  such as  calcium  and magnesi   n  ions  did.  However   calcium  ion  only  slightly  reduced  the  equilibrium  swelling  under  sodium­
rich conditions. The viscosity (as an indicator of fluidity) of polycarbophil was larger than that of CMC-Na at every shear rate and po   ner content examined.
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Physicochemical Properties of Calcium Polycarbophil, a Water-absorbing Polymer.docx

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