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首页> 外文期刊>Journal of Applied Polymer Science >Mechanism and Kinetics of Ultra-High Molecular Weight Polytetrafluoroethylene Sintering
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Mechanism and Kinetics of Ultra-High Molecular Weight Polytetrafluoroethylene Sintering

机译：超高分子量聚四氟乙烯烧结的机理和动力学

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摘要

The effect of sintering time on the melt evolution of Ultra-High Molecular Weight Polytetrafluoroethylene was studied in situ by high temperature Wide Angle X-ray Scattering, and by cyclic thermal loading profiles within a Differential Scanning Calorimeter (DSC) and Thermo-Mechanical Analyzer (TMA). Results obtained from these techniques support the concept of molecular ordering in the melt state as a function of sintering time well above the melting temperature. TMA, which is not a conventional technique for monitoring thermal transitions, is shown to be sensitive enough for such purposes. Both DSC and TMA exhibit nonequilibrium melt behavior even 30°C above its equilibrium melting temperature for long time periods. A correlation between the DSC and TMA results is established. The cyclic thermal profile leads to a dramatic growth in enthalpy of crystallization/melting. The mechanism for this growth is associated with two independent processes; isothermal annealing at the sintering temperature and lamellar thickening in the solid state. VC 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40967.
机译：通过高温广角X射线散射以及差示扫描量热仪（DSC）和热机械分析仪中的循环热负荷曲线，现场研究了烧结时间对超高分子量聚四氟乙烯熔体演变的影响。 TMA）。从这些技术获得的结果支持了熔融状态下分子有序化的概念，该概念是远远高于熔融温度的烧结时间的函数。 TMA不是用于监视热转变的常规技术，但已显示出足够的灵敏性可用于此目的。 DSC和TMA都表现出非平衡熔融行为，即使长时间高于其平衡熔融温度30°C也是如此。建立了DSC和TMA结果之间的相关性。循环热分布导致结晶/熔融焓显着增加。这种增长的机制与两个独立的过程相关;在烧结温度下进行等温退火，并在固态下进行层状增厚。 VC 2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2014，131，40967。

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