High-Pressure–High Temperature (HP-HT) Stability of Polytetrafluoroethylene: Raman Spectroscopic Study Up to 10 GPa and 600 ℃
High-Pressure–High Temperature (HP-HT) Stability of Polytetrafluoroethylene: Raman Spectroscopic Study Up to 10 GPa and 600 ℃
复制标题
聚四氟乙烯的高压高温 (HP-HT) 稳定性：高达 10 GPa 和 600 °C 的拉曼光谱研究
DOI：
10.1177/0003702817691529
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发表时间：
2017
影响因子：
3.5
通讯作者：
K. Litasov
中科院分区：
文献类型：
--
作者：
A. Likhacheva;A. Chanyshev;S. Goryainov;S. Rashchenko;K. Litasov
在极端条件下使用聚合物的需求日益增加，使得在宽压力和温度范围内探索其行为变得重要，这对于最常见的材料之一聚四氟乙烯（PTFE）来说仍然是未知的。原位拉曼光谱研究表明，PTFE在500 ℃时在2-6 GPa范围内稳定，在400 ℃时可达12 GPa。在T > 500 ℃、P > 3.5GPa时，PTFE发生石墨化，但从液体运行产物的保存情况来看，PTFE可用作600 ℃以下的样品容器材料。通过与多环芳烃的行为类比，所获得的数据允许建议，液体、固体和分解的（PTFE）PTFE之间的三相点位于约550 ℃下的3和4 GPa之间。
The increasing demand for use of polymers at extreme conditions makes important the exploration of their behavior in a wide pressure and temperature range, which remains unknown for polytetrafluoroethylene (PTFE), one of the most common materials. An in situ Raman spectroscopic study of PTFE shows that it is stable within the range of 2–6 GPa at 500 ℃ and up to 12 GPa at 400 ℃. At T > 500 ℃ and P > 3.5 GPa, the graphitization of PTFE is observed, but judging from the preservation of liquid run products, PTFE can be used as a material for sample container up to 600 ℃ at this pressure. The obtained data allow the suggestion that the triple point between liquid, solid, and decomposed (carbonized) PTFE is located between 3 and 4 GPa at about 550 ℃, by analogy with the behavior of polycyclic aromatic hydrocarbons.