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首页> 外文期刊>Journal of Applied Polymer Science >Hot-wire parallel technique: A new method for simultaneous determination of thermal properties of polymers
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Hot-wire parallel technique: A new method for simultaneous determination of thermal properties of polymers

机译：热线平行技术：一种同时测定聚合物热性质的新方法

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摘要

The hot-wire parallel technique standardized for determining the thermal conductivity of ceramic materials was employed in the determination of the thermal properties of polymers. For these materials, additional care must be taken considering the low melting point of polymers, when compared with that for ceramic materials. Samples can be prepared either in the shape of bricks or in the shape of half-cylinders. The thermal conductivity and the specific heat were simultaneously determined from the same experimental thermal transient, and the thermal diffusivity is derived from these properties. Five different polymers with different structures at room temperature were selected, and measurements were carried out from room temperature to approximately the maximum service operating temperature. A nonlinear least-squares fitting method was employed in the calculations, so that all the experimental points obtained are considered in the thermal properties' calculations. The apparatus used in this work is fully automatic. The reproducibility is very good with respect to the thermal conductivity, even with a defective experimental arrangement with respect to the theoretical model. However, deviations from the theoretical model have a severe influence on the specific heat values and, consequently, on the thermal diffusivity. Experimental results were compared with those available in the literature, showing the applicability of this technique for the determination of thermal properties of polymers. (C) 2002 Wiley Periodicals, Inc. [References: 17]
机译：用于确定陶瓷材料导热性的标准化热线平行技术被用于确定聚合物的热性能。对于这些材料，与陶瓷材料相比，必须特别注意聚合物的低熔点。样品可以制成砖状或半圆柱状。从相同的实验热瞬态同时确定热导率和比热，并且从这些特性得出热扩散率。选择了五种在室温下具有不同结构的不同聚合物，并进行了从室温到大约最高使用温度的测量。计算中采用了非线性最小二乘拟合法，因此在热性能的计算中考虑了所有获得的实验点。用于这项工作的设备是全自动的。即使在相对于理论模型的实验布置有缺陷的情况下，相对于热导率的再现性也非常好。但是，与理论模型的偏差严重影响了比热值，进而影响了热扩散率。将实验结果与文献中的结果进行了比较，表明该技术可用于测定聚合物的热性能。 （C）2002 Wiley Periodicals，Inc. [参考：17]

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