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首页> 外文期刊>Cearmics >THE EFFECT OF HEAT TREATMENT OF AN IONOMER GLASS ON ITS SURFACE CHARACTERISTICS AND CEMENT-FORMING PROPERTIES
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THE EFFECT OF HEAT TREATMENT OF AN IONOMER GLASS ON ITS SURFACE CHARACTERISTICS AND CEMENT-FORMING PROPERTIES

机译：离子玻璃的热处理对其表面特性和成胶性能的影响

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The surface properties of G338 ionomer glass powder, both in as-received and heat-treated, have been studied in order to identify the reason that heat-treatment gives a cement that sets quicker but is weaker. Samples of G338 glass were analysed by X-ray fluorescence spectroscopy and the density determined by gas pycnometry. As-received and heat-treated (at 240 °C) glass powders were examined by Scanning Electron Microscopy. Specific surface area (BET) and pore volume were determined with low temperature nitrogen sorption, using eight individual powder samples. Thermo-gravimetric analysis was carried out on as-received G338 in the range 30-900 °C ramped at 10 °C/min in an inert atmosphere. Results showed the appearance of the as-received and heat-treated G338 powders to be the same, as were the specific surface areas and pore volumes. The density was found to be 2.6438 (±0.0093) g/cm3 and the XRF results were consistent with the known composition of the glass. Thermo-gravimetric analysis showed that the glass powder lost mass four steps, which were attributed to variations in states of water-binding on the surface of the glass. These findings lead to the conclusion that the observed differences in the setting properties of the glass G338 with poly(acrylic acid) and the strength of the resulting cements are not due to physical differences between the powders but to variations in the amount and state of surface water. Specifically, these variations are between differences in water binding to silanol groups that occur on glass surfaces.
机译：已经研究了G338离聚物玻璃粉末的表面性能，无论是按原样还是经过热处理，以查明热处理使胶结剂凝固更快但较弱的原因。通过X射线荧光光谱分析G338玻璃的样品，并通过比重瓶比重瓶测定密度。通过扫描电子显微镜检查所接收和热处理的（在240℃下）玻璃粉末。使用八个单独的粉末样品，通过低温氮吸附测定比表面积（BET）和孔体积。在惰性气氛中，以30-900°C的升温速率对G338进行热重分析，升温速率为10°C / min。结果显示，所接收和热处理的G338粉末的外观与比表面积和孔体积相同。发现密度为2.6438（±0.0093）g / cm 3，并且XRF结果与玻璃的已知组成一致。热重分析表明，玻璃粉损失了四个步骤的质量，这归因于玻璃表面上水结合状态的变化。这些发现得出这样的结论：观察到的玻璃G338与聚丙烯酸的凝结性能差异以及所得水泥的强度并不是由于粉末之间的物理差异，而是由于表面数量和状态的变化水。特别地，这些变化是在玻璃表面上与硅醇基团结合的水的差异之间。

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