Anisotropic Thermal Conductivity in Shear Deformations of Polymer Melts

Venerus的项目0075789变形聚合物中的各向异性热传导聚合物分子的流动诱导取向导致各向异性的机械、光学和热性能，并对材料性能产生深远影响。 本研究的目的是获得定量的，随时间变化的测量变形聚合物液体的热扩散率张量。 这些测量将使用被称为强迫瑞利散射的非侵入性光学技术进行。 实验将进行几个聚合物熔体在阶跃剪切应变和停止稳定的剪切速率流动。 热扩散率张量的测量分量将与机械（应力）和光学（双折射）数据结合使用，以评估应力-热规则。 了解聚合物加工过程中发生的流动诱导取向与其最终用途物理性能之间的联系至关重要。 在这项研究中获得的热扩散率张量测量将显着提高努力制定物理意义的过程流模型，可用于先进的加工技术和应用的发展。

Abstract for Venerus' project0075789 Anisotropic Thermal Conduction in Deforming PolymersFlow-induced orientation of polymeric molecules results in anisotropic mechanical, optical and thermal properties and has profound effects on material properties. The objective of this study is to obtain quantitative, time-dependent measurements of the thermal diffusivity tensor in deforming polymer liquids. These measurements will be made using a non-invasive optical technique known as Forced Rayleigh Scattering. Experiments will be conducted on several polymer melts in step-shear strain and cessation of steady shear rate flows. Measured components of the thermal diffusivity tensor will used in conjunction with mechanical (stress) and optical (birefringence) data to evaluate the stress-thermal rule. Understanding the connection between the flow-induced orientation that occurs during processing of polymers and their end-use physical properties is essential. The thermal diffusivity tensor measurements obtained in this study will significantly enhance efforts to formulate physically-meaningful process flow models that can be used for the development of advanced processing technologies and applications.