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首页> 外文期刊>Journal of Materials Research >Synthesis and characterization of new inorganic polymeric composites based on kaolin or white lay and on ground-granulated blast furnace slag
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Synthesis and characterization of new inorganic polymeric composites based on kaolin or white lay and on ground-granulated blast furnace slag

机译：基于高岭土或白胶泥和粒状高炉矿渣的新型无机聚合物复合材料的合成与表征

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摘要

Alkali activation of dehydroxylated kaolin or clay yielded high-strength polymeric materials, so-called geopolymers. They were synthesized by mixing the aluminosilicate with solutions of sodium metasilicate and KOH followed by adding 45 wt.% of ground-granulated blast furnace slag. The influence of the aluminosilicate source, its activation temperature, and the order of mixing raw materials were studied on the workability of the blending paste, the microstructure, and the Vickers hardness of the geopolymer samples. The polymeric material is completely amorphous according to x-ray diffraction. Solid-state ~(27)Al and ~(29)Si magic-angle-spinning nuclear magnetic resonance showed that the geopolymer consists of AlO_4 and SiO_4 tetrahedra linked together through a polymeric network constituted by branched entities SiQ~4(4Al) and SiQ~4(3Al), but also by less-polymerized silicates SiQ~1 and SiQ~2. Scanning electron microscopy showed a homogeneous polymeric gel matrix containing unreacted slag (and quartz) grains; thermogravimetric analysis and differential scanning calorimetry exhibited a high content of water and an elevated melting point (1260℃). Vickers hardness values are in the range of 200 MPa.
机译：脱羟基高岭土或粘土的碱活化产生了高强度聚合物材料，即所谓的地质聚合物。它们是通过将铝硅酸盐与偏硅酸钠和KOH的溶液混合，然后添加45 wt。％的地面造粒的高炉矿渣来合成的。研究了硅铝酸盐源，其活化温度和混合原料的顺序对掺合糊料的可加工性，微观结构以及地质聚合物样品的维氏硬度的影响。根据X射线衍射，聚合物材料是完全无定形的。固态〜（27）Al和〜（29）Si幻角自旋核磁共振表明，地聚合物由AlO_4和SiO_4四面体通过由支化实体SiQ〜4（4Al）和SiQ构成的聚合物网络连接在一起〜4（3Al），也可以由聚合度较低的硅酸盐SiQ〜1和SiQ〜2组成。扫描电子显微镜显示均质的聚合物凝胶基质，其中含有未反应的炉渣（和石英）晶粒。热重分析和差示扫描量热法显示水含量高，熔点升高（1260℃）。维氏硬度值在200 MPa的范围内。

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