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本文在前两文基础上,进一步研究了Na_2O-CaO-SiO_2玻璃的聚合结构。玻璃经三甲基硅烷化(TMS)反应后,用气相色谱(GLC)和凝胶色谱(GPC)测定可溶性TMS产物的聚合分布;用元素分析仪测定不溶性TMS产物的C和H的含量,并由此推导出其结构形式。实验结果表明,在所研究的22种玻璃中,SiO_4~(4-)四面体的聚合形式分为四类:低聚物、高聚物、三维网络碎片和三维无限网络。玻璃中硅酸阴离子团的聚合度随SiO_2含量的增加而增加,Na_2O/CaO比值η对之也有影响。实验结果证实了玻璃结构聚合物理论提出的观点。初步认为,Na_2O-CaO-SiO_2系统玻璃结构可按组成划分为组群状结构区、三维网络碎片结构区、三维无限网络结构区和疏松网络结构区等四个区域。
Based on the previous two articles, this paper further studies the polymerization structure of Na 2 O-CaO-SiO 2 glass. The glass was subjected to a trimethylsilylation (TMS) reaction to determine the polymerization distribution of the soluble TMS product by gas chromatography (GLC) and gel chromatography (GPC); the C and H contents of the insoluble TMS product were determined by elemental analysis and From this deduced its structure. The experimental results show that among the 22 kinds of glasses studied, the polymerization forms of SiO 4 4- (4) tetrahedra are divided into four groups: oligomers, polymers, three-dimensional network fragments and three-dimensional infinite network. The degree of polymerization of silicic acid anion groups in glass increases with the increase of SiO 2 content, and the ratio of Na 2 O / CaO also affects it. The experimental results confirm the viewpoint put forward by the theory of glass structure polymer. It is preliminarily believed that the glass structure of Na 2 O-CaO-SiO 2 system can be divided into four groups according to composition, such as group structure area, three-dimensional network fragment structure area, three-dimensional infinite network structure area and loose network structure area.