کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1695237 1519105 2012 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Kaolin/poly(acrylic acid) composites as precursors for porous kaolin ceramics
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
Kaolin/poly(acrylic acid) composites as precursors for porous kaolin ceramics
چکیده انگلیسی

Kaolin–polymer hydrogel composites were synthesized via redox-initiated polymerization of acrylic acid (AA) in a concentrated aqueous dispersion of kaolin, using N,N′-methylene bisacrylamide as a crosslinker. The mechanical and thermal properties of the composites were investigated by systematic variation of the monomer feed composition. From rheological measurements, it was found that kaolin had a negative effect on the polymerization rate, which decreased the stiffness of the green bodies prepared at room temperature with increasing kaolin content. The gelation time was varied by changing the concentration of the redox initiator. On drying at 105 °C, the crosslinking continued to a higher degree. Larger kaolin contents yielded to stiffer composites, as determined from uniaxial compression measurements. The compressive strength increases with the AA concentration, up to AA concentrations > 25 mass% (relative to kaolin). The equilibrium swelling ratio of the fully-cured kaolin/poly(acrylic acid) composites in water increased as expected with increasing AA content. These particular composite systems formed porous kaolin ceramics with porosity > 60% after burning off the organic materials.


► High strength machinable kaolin/polymer composites were prepared by a waterborne process
► kaolin particles inhibited the polymer gel formation
► gelation times could be easily modulated
► The acrylic acid served as a network component and as a sacrificial porogen
► Kaolin ceramics with porosity > 60% were obtained after burning out the organic materials

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Clay Science - Volumes 62–63, July 2012, Pages 63–69
نویسندگان
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