On the frequency correction in temperature-modulated differential scanning calorimetry of the glass transition

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• 作者：Xiaoju Guo^a ; ^b ; John C. Mauro^a ; ^{mauroj@corning.com} ; Douglas C. Allan^a ; Yuanzheng Yue^b ; ^c ; ^{yy@bio.aau.dk}
• 关键词：Temperature-modulated differential scanning calorimetry ; Frequency correction ; Glass transition ; Glass relaxation
• 刊名：Journal of Non-Crystalline Solids
• 出版年：2012
• 期刊代码：50_00223093
• 类别：ms
• 出版时间：15 July, 2012
• 卷：358
• 期：14
• 页码：1710-1715
• 文件大小：618 K

摘要

Temperature-modulated differential scanning calorimetry (TMDSC) is based on conventional DSC but with a sinusoidally modulated temperature path. Simulations of TMDSC signals were performed for Corning EAGLE XG glass over a wide range of modulation frequencies. Our results reveal that the frequency correction commonly used in the interpretation of TMDSC signals leads to a master nonreversing heat flow curve independent of modulation frequency, provided that sufficiently high frequencies are employed in the TMDSC measurement. A master reversing heat flow curve can also be generated through the frequency correction. The resulting glass transition temperature from the frequency corrected reversing heat flow is thereby shown to be independent of frequency.