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Description of PVT Behavior of an Industrial Polypropylene-EPR Copolymer in Process Conditions

机译:工业聚丙烯-EPR共聚物在工艺条件下的PVT行为描述

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摘要

An experimental procedure is presented to describe the PVT behavior of multiphase polymeric materials in a wide range of cooling rates.In particular.the procedure is applied to a typical multiphase industrial polymer,that is,an industrial polypropylene-ethylene-propylene rubber (Ipp-epr) copolymer with a small percentage of talc.The volume evolution is described combining specific volumes of different phases present in the material.All phases are described simply by thermal expansion and compressibility coefficients drawn either from the literature or from low and high temperature (i.e.,below and above the iPP crystallization range) standard PVT data.Crystallization evolution of iPP is described by the Nakamura nonisothermal formulation of the Avrami-Evans crystallization kinetic model.Model parameters are identified by comparison with both standard calorimetric results and final densities of thin samples solidified during quenches conducted with cooling rates of several hundreds of K/s.It is also shown that identification of crystallization kinetic parameters by means of calorimetric data only leads to misleading results for cooling rates larger than those adopted in the calorimetric tests.
机译:提出了一种实验程序来描述多相聚合物材料在宽广的冷却速率下的PVT行为。特别是,该程序适用于典型的多相工业聚合物,即工业聚丙烯-乙烯-丙烯橡胶(Ipp- epr)滑石占很小百分比的共聚物。结合材料中存在的不同相的特定体积来描述体积演化。所有相都可以简单地通过文献或低温和高温下的热膨胀系数和可压缩系数来描述(即在iPP结晶范围内及以下)标准PVT数据。通过Avrami-Evans结晶动力学模型的中村非等温公式描述了iPP的结晶演化。通过与标准量热结果和薄样品的最终密度进行比较,确定了模型参数。在以数百K /的冷却速率进行的淬火过程中凝固还表明,通过量热数据鉴定结晶动力学参数只会导致误导性的结果,即冷却速度大于量热测试中采用的结果。

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