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为揭示偏高岭土基地聚合物的微观孔结构特征并探索介孔地聚合物制备和微孔结构调控途径,采用氮气吸附法研究了偏高岭土基地聚合物的吸附/脱附等温曲线和微观孔结构特征(包括总孔体积、比表面积、孔形状和孔径分布等),并讨论了水玻璃模数和水用量对地聚合物孔结构的影响。结果表明:偏高岭土基地聚合物吸附/脱附等温曲线为IV型,迟滞回线为H1和H3混合型;总孔体积为0.141 8~0.313 6 cm~3/g,比表面积为28.87~53.25 m~2/g,孔径为2~92 nm,其中孔径为2~50 nm的介孔分别占总孔体积和比表面积的97.82%和98.87%;地聚合物中的孔以两端开放的圆柱形孔、平行板狭缝孔为主,同时存在少量一端封闭的圆柱形孔、平行板狭缝孔或墨水瓶孔。调整水玻璃模数和水用量均可在一定范围内调控偏高岭土基地聚合物孔结构。水玻璃模数由1.2增至1.8时,其总孔体积由0.225 3 cm~3/g降至0.141 8 cm~3/g,最可几孔径在13.91~19.56 nm范围;水用量由15.5增至18.5时,其总孔体积从0.221 9 cm~3/g逐渐增至0.313 6 cm~3/g,孔径分布先由水用量为15.5的单峰分布变为双峰分布;水用量增至18.5时,孔径分布显著宽化,最可几孔径消失。水用量比水玻璃模数对偏高岭土基地聚合物孔结构具有更强的调控效应。
In order to reveal the microscopic pore structure characteristics of metakaolin base polymer and explore the preparation of mesoporous polymer and the way of controlling the micropore structure, the adsorption / desorption isotherms and microstructure characteristics of metakaolin base polymer were studied by nitrogen adsorption (Including total pore volume, specific surface area, pore shape and pore size distribution). The influence of water glass modulus and water dosage on the pore structure of geopolymer was also discussed. The results show that the adsorption-desorption isotherm curve of metakaolin is IV type and the hysteresis loop is H1 and H3. The total pore volume is 0.141 8 ~ 0.313 6 cm ~ 3 / g, the specific surface area is 28.87 ~ 53.25 m ~ 2 / g, pore size of 2 ~ 92 nm, mesopores with pore sizes of 2 ~ 50 nm accounted for 97.82% and 98.87% of the total pore volume and specific surface area, respectively. The pores in geopolymer were cylindrical Holes, parallel to the slit plate hole mainly at the same time there is a small amount of one end closed cylindrical hole, parallel plate slit hole or inkwell hole. Adjustment of water glass modulus and water dosage can regulate the pore structure of metakaolin base polymer within a certain range. When the water glass modulus increased from 1.2 to 1.8, the total pore volume decreased from 0.225 3 cm -3 / g to 0.141 8 cm -3 / g and the most probable pore size ranged from 13.91 to 19.56 nm. The water content increased from 15.5 18.5, the total pore volume increased gradually from 0.221 9 cm ~ 3 / g to 0.313 6 cm ~ 3 / g, and the pore size distribution firstly changed from a unimodal distribution with a water content of 15.5 to a bimodal distribution. When the amount of water was increased to 18.5 , Pore size distribution significantly wider, most can be a few pore size disappears. The amount of water has a stronger regulation effect on the pore structure of metakaolin polymer than the water glass modulus.