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首页> 外文期刊>Journal of Applied Polymer Science >Comprehensive insight of crosslinking agent concentration influence on starch-based aerogels porous structure
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Comprehensive insight of crosslinking agent concentration influence on starch-based aerogels porous structure

机译：交联剂浓度对淀粉基气凝胶多孔结构的综合洞察力

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摘要

In this work, we evaluated starch-based aerogels prepared using freeze-drying, and an eco-friendly crosslinking agent (trisodium citrate), in three different concentrations: 12.8, 19.3, and 25.7 mg ml(-1). Aerogels were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, relative density, porosity percentage, scanning electron microscopy (SEM), and water uptake. The results indicated a higher reticulation and crystallinity and lower water uptake, increasing crosslinking agent concentration (Aero 1:2). SEM images revealed the prominent presence of macroporous structure (more than 50 nm) within the aerogel, containing small and large pores within the aerogel structure. The small pores were statistically similar for Aero 1:1 and Aero 1:1.5, as observed by analysis of variance analysis, but they were statistically different from Aero 1:2. The large pores diameter increased with higher crosslinking concentration and induced them as closed pores, resulting in a less porous structure. This result is directly associated with a higher reticulation degree. Overall, the influence of crosslinking agent concentration was studied and indicated that Aero 1:1.5 presented valuable properties.
机译：在这项工作中，我们评估了使用冷冻干燥和环保交联剂（柠檬酸三钠）在三种不同浓度下制备的淀粉基气凝胶：12.8、19.3和25.7 mg ml（-1）。通过傅里叶变换红外光谱、X射线衍射、相对密度、孔隙率、扫描电子显微镜（SEM）和吸水率对气凝胶进行了表征。结果表明，随着交联剂浓度（Aero 1:2）的增加，聚合物的网状结构和结晶度提高，吸水率降低。SEM图像显示，气凝胶中显著存在大孔结构（超过50 nm），气凝胶结构中包含大小孔。通过方差分析观察到，Aero 1:1和Aero 1:1.5的小孔在统计学上相似，但它们在统计学上不同于Aero 1:2。交联浓度越高，大孔直径越大，并诱导其形成封闭孔，从而导致孔结构越小。这一结果与较高的网状程度直接相关。总体而言，研究了交联剂浓度的影响，并表明Aero 1:1.5具有宝贵的性能。

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