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首页> 外文期刊>Journal of Applied Polymer Science >High-Pressure Differential Thermal Analysis of Polymers
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High-Pressure Differential Thermal Analysis of Polymers

机译：聚合物的高压差热分析

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摘要

Melting behavior under high pressure of nylon 6, nylon 6-clay hybrid (NCH) and poly(butylene terephthalate) was investigated by high-pressure differential thermal analysis (DTA). It was found that the melting temperature and the pressure dependency of the melting temperature ofNCH were low compared with those of nylon 6. Using the melting temperature, the pressure dependency of the melting temperature, and the heat of fusion (the enthalpy of fusion), the Clausius-Clapeyron equation was used to determine the volume changes on melting of the polymers at atmospheric pressure A V mO(DTA). A V mO(DTA) of NCH was lower than that of the nylon 6 a-form. The smaller A V mo(DTA) of NCH was attributed to the presence of nylon 6 y-form in NCH. The values of A V mo(DTA) for nylon 6 and poly(butylene terephthalate) were similar to those obtained from pressure-volume-temperature relationships A V mO(PVT) of those polymers. The entropies of fusion were constant and independent of pressure~ up to 100 MPa. The volume changes on melting (A V m in cm3/g) under high pressure can be approximately described by the following equation: A V m = 0.165T m V w (dT m/dP)/ (dT moldP)/298, where T m and T mO are the melting temperatures (in K) under high pressure and atmospheric pressure, respectively and V w is the van der Waals volume of the polymer (cm3/g).
机译：通过高压差热分析（​​DTA）研究了尼龙6，尼龙6-粘土杂化物（NCH）和聚对苯二甲酸丁二醇酯在高压下的熔融行为。发现NCH的熔融温度和熔融温度的压力依赖性比尼龙6低。使用熔融温度，熔融温度的压力依赖性和熔融热（熔融焓），使用Clausius-Clapeyron方程确定在大气压AV mO（DTA）下聚合物熔融时的体积变化。 NCH的V mO（DTA）低于尼龙6 a型。 NCH的A V mo（DTA）较小是由于NCH中存在尼龙6 y型。尼龙6和聚对苯二甲酸丁二醇酯的A V mo（DTA）值类似于从这些聚合物的压力-体积-温度关系A V mO（PVT）获得的值。熔化的熵是恒定的，并且与高达100 MPa的压力无关。高压下熔化时的体积变化（AV m单位为cm3 / g）可以通过以下公式近似描述：AV m = 0.165T m V w（dT m / dP）/（dTmoldP）/ 298，其中T m和T mO分别是在高压和大气压下的熔融温度（单位为K），V w是聚合物的范德华体积（cm3 / g）。

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