| DSC测试中样品内部的温度分布及其对比热测试的影响 |
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| 引用本文： | 赵冬梅,李丽霞,郑扬,左阳,刘国栋.DSC测试中样品内部的温度分布及其对比热测试的影响[J].高分子学报,2012(7):754-758. |
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| 作者姓名： | 赵冬梅 李丽霞 郑扬 左阳 刘国栋 |
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| 作者单位： | 河北工业大学化工学院 天津300130 |
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| 基金项目： | 国家自然科学青年基金，河北省自然科学基金，教育部功能高分子材料重点实验室开放基金 |
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| 摘 要： | 由傅里叶导热定律结合Tools-Narayanaswamy-Moynihan(TNM)松弛模型提出了一种计算聚合物样品内温度分布的方法.对PS的计算结果表明温度梯度随样品厚度、升温速率增大而增大,对于1.0 mm的PS以1 K/min降温后再以10 K/min升温时样品内部最大温差为0.882 K.在此基础上提出了不同样品厚度、不同热处理条件下聚合物测定比热的计算方法,结果表明计算结果与实测数据基本一致.
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| 关 键 词： | DSC 比热 玻璃化转变 焓松弛 聚苯乙烯 温度梯度 |
TEMPERATURE DISTRIBUTION IN THE SAMPLE AND ITS EFFECT ON THE DETERMINATION OF HEAT CAPACITY IN DSC MEASUREMENTS |
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| Dong-mei Zhao
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Li-xia Li
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Yang Zheng
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Yang Zuo
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Guo-dong Liu.TEMPERATURE DISTRIBUTION IN THE SAMPLE AND ITS EFFECT ON THE DETERMINATION OF HEAT CAPACITY IN DSC MEASUREMENTS[J].Acta Polymerica Sinica,2012(7):754-758. |
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| Authors: | Dong-mei Zhao Li-xia Li Yang Zheng Yang Zuo Guo-dong Liu |
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| Institution: | (School of Chemical Engineering,Hebei University of Technology,Tianjin 300130) |
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| Abstract: | A method for calculating the temperature distribution in the polymer sample during DSC measurements was proposed in this paper based on the one-dimensional heat conduction equation and Tools-Narayanaswamy-Moynihan(TNM) model.It was found that the temperature lag increased remarkably with increasing sample thickness and heating rate.A maximum temperature difference between the center and the surface of a PS sample with 1.0 mm thickness was calculated to be 0.882 K when it was heated at a rate of 10 K/min after cooling at 1 K/min.Meanwhile,a method for calculating the sensible heat capacity of the polymer with different thicknesses after different thermal treatments was proposed.The theoretical results were consistent with the experimental data. |
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| Keywords: | Differential scanning calorimetry Enthalpy relaxation Glass transition Heat capacity Polystyrene Temperature gradient |
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