科研之友
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摘要
In this paper, a six-factor and five-level orthogonal test was designed to investigate the influence factors on the solution absorbency of poly(acrylic acid-co-acrylamide) super absorbent resin (PAA/AM SAR). The results showed that the mass ratio of AA to AM played a predominant role in the synthesis of high-performance SAR. The copolymer composition was 0.625 for the optimal absorbency copolymer. To control the copolymer composition, the reactivity ratios of AA and AM, which were 0.365 and 0.753, respectively, were determined at 60 A degrees C using the integral method. The concentration of residual monomers was measured by ultraviolet spectrophotometry (UV) and gas chromatography (GC) methods. The copolymer composition was controlled by molar fraction of monomer AA = 0.64, monomer conversion at 80-90 % and copolymerization at 60 A degrees C. To improve the solution absorbency and water retention, PAA/AM SAR was modified by polyvinyl alcohol (PVA), cellulose and kaolin clay (KC). It is worth noting that the sample modified by the feed AA and AM PVA significantly increased the deionized water absorbency to 1,617 g/g and KC enhanced the 0.9 wt% NaCl absorbency to 189 g/g, which were higher than those of the commercial products. The chemical structure of copolymers was characterized by carbon-13 nuclear magnetic resonance spectroscopy (C-13 NMR) and fourier transform infrared spectrum (FTIR) and their pore morphology was investigated by scanning electron microscope (SEM).
- 出版日期2014-5
- 单位东北林业大学
