【摘要】 用红外光谱研究了玻璃离子水门汀固化反应过程,结果显示,表征聚丙烯酸盐的峰强度(~1413cm-1)随时间延长而逐渐增加,而硅醇基团,即最强峰(~1039cm-1)上的肩峰(950cm-1),在所观察的周期中仍然存在。因此,玻璃离子水门汀抗压强度随时间延长而增加的原因在于:①Ca2+,Al3+与聚丙烯酸的固化化学反应在一个相当长的时间内仍在进行;②因玻璃结构分解形成的硅醇基团将长期存在,并在缩合形成硅凝胶的过程中,改变基体与填料间的界面结构和组成,因此对玻璃离子水门汀的长期力学性能也将产生一定的影响。更多还原

【Abstract】 The set reaction of glass ionomer cement has been investigated by means of IR spectra. It has been found that the band （intensity） around 1 413 cm^-1 due to the vibration of polyacrylate salt increased with aging, and the shoulder band at 950 cm^-1 due to the stretching vibration of Si—OH still appeared during the periods studied. The results are consistent with that of mechanical determination of compressive strength, which suggested that the crosslink density increase resulting from the slow diffusion of Ca²⁺ and Al³⁺ is responsible for compressive strength increasing with aging, and forming and maturing of interface layer comprising of silica gel also have a significant effect on the properties of glass ionomer cements.更多还原