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首页> 外文期刊>Journal of Applied Polymer Science >Crystallization kinetics and PVT behavior of poly(vinylidene fluoride) in process conditions
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Crystallization kinetics and PVT behavior of poly(vinylidene fluoride) in process conditions

机译：工艺条件下聚偏二氟乙烯的结晶动力学和PVT行为

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摘要

The so-called fluoropolymers have gained, in recent years, considerable industrial success, and the increasing industrial interest in this class of materials has caused a need for better characterization of the properties of interest for processability, for instance, for injection molding or extrusion. In this work, the pressure-volume-temperatre (PVT) relationship of a poly(vinylidene fluoride) is described by combining specific volumes of amorphous and crystalline phases present in the material. The volumes of the two phases are described simply by thermal expansion and compressibility coefficients drawn from standard PVT data below and above the crystallization range. Within the crystallization range, the material volume is assumed to change from amorphous to crystalline according to the evolution of an overall crystallinity degree, which is described by the Nakamura nonisothermal formulation of an Avrami crystallization kinetic model. Model parameters are identified by comparison with standard calorimetric results, PVT data, and final densities of thin samples solidified during quenches conducted with cooling rates of several hundreds of Kelvins/second. The resulting model allows the description of the PVT behavior of PVDF in the pressure -and cooling-rate ranges of interest for processing. (C) 2003 Wiley Periodicals, Inc. [References: 16]
机译：近年来，所谓的含氟聚合物已经获得了可观的工业成功，并且对这类材料的日益增长的工业兴趣引起了对可加工性例如注射成型或挤出的感兴趣的特性的更好表征的需求。在这项工作中，聚偏二氟乙烯的压力-体积-温度（PVT）关系是通过组合材料中存在的特定体积的非晶相和结晶相来描述的。通过从结晶范围以下和之上的标准PVT数据得出的热膨胀系数和可压缩系数，可以简单地描述两相的体积。在结晶范围内，根据总结晶度的演变，假定材料体积从无定形变为结晶，这由Avrami结晶动力学模型的Nakamura非等温公式描述。通过与标准量热结果，PVT数据以及以数百开尔文/秒的冷却速率进行的淬火过程中凝固的稀薄样品的最终密度进行比较，可以确定模型参数。所得模型允许描述PVDF在加工所需的压力和冷却速率范围内的PVT行为。 （C）2003 Wiley Periodicals，Inc. [参考：16]

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