کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1384088 | 1500652 | 2014 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Preparation and properties of PEC nanocomposite membranes with carboxymethyl cellulose and modified silica Preparation and properties of PEC nanocomposite membranes with carboxymethyl cellulose and modified silica](/preview/png/1384088.png)
• Silica modified with polyelectrolyte was synthesized.
• Membranes were prepared incorporation of modified silica.
• Membranes demonstrate enhanced mechanical property and separation performance.
Carboxymethyl cellulose (CMC)-modified silica nanocomposites were prepared via in situ incorporation of modified silica during the ionic complexation between CMC and poly(2-methacryloyloxy ethyl trimethylammonium chloride) (PDMC). Ionic bonds were introduced between the poly(2-acrylamido-2-methylproanesulfonic acid) modified silica (SiO2-PAMPS) and the polyelectrolyte complex (PEC) matrix. The PEC nanocomposites (PECNs) and their membranes (PECNMs) were characterized with Fourier transform-infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and tensile testing. PECNM containing 5 wt.% SiO2-PAMPS showed a tensile strength of 68 MPa and elongation at break of 7.1%, which were 1.9 and 2.6 times as high as those of pristine PEC membranes, respectively. Moreover, the pervaporation performance of as-prepared PECNMs was evaluated with dehydration of 10 wt.% aqueous isopropanol mixtures, and the PECNMs exhibited a flux of 2400 g m−2 h−1 with a high separation factor of 4491 at 70 °C.
Journal: Carbohydrate Polymers - Volume 106, 15 June 2014, Pages 403–409