Determining the Relation Between Molecular Structure and Macroscopic Heat Transport in Oriented and Stressed Polymers.

确定取向和应力聚合物中分子结构与宏观热传输之间的关系。

• 批准号: 0706582
• 负责人: Jay Schieber
• 金额: $ 39万
• 依托单位: Illinois Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-08-01 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0706582&HistoricalAwards=false
• 关键词: Determining; Relation; Between; Molecular; Structure

TECHNICAL SUMMARY:An experimental study into the origins of anisotropic thermal conductivity of solidpolymers is proposed. In particular, a relationship between the molecular structure ofthe polymer and the resulting macroscopic properties is sought. It has already beenestablished that (1) deformed, cross-linked elastomers exhibit an anisotropic thermalconductivity tensor, k (2) the tensor k is linearly related to the extra stress tensor,for the polymer in the same state, and (3) the constant of relation for these twoquantities exhibits a universal value of 0.03, independent of chemistry for the fewsystems studied, when properly made dimensionless. In this work a set of experimentshas been designed that will distinguish between competing theories to describe theseobservations. A non-invasive optical technique called Forced Rayleigh Light Scatteringto examine novel material states is used. Results will necessarily distinguish betweencompeting theories on the origins of the effect.The results of the study will have broad impact on the transport modeling of advancedmaterials containing plastic. While previous work showed how non-isothermalmodeling of liquids requires an additional complexity because of anisotropy, it alsosuggested that this complexity could be easily modeled through use of a phenomenologicalrelation to stress. The current work, if successful, should determine if similarprinciples apply to the solid polymer during cooling.NON-TECHNICAL SUMMARY:An experimental study into the origins of how heat flows differently in differentdirections for solid polymers, such as plastic, is proposed. In particular, a relationshipbetween how the molecules are behaving and the resulting heat-flow propertiesis sought. In this work a set of experiments has been designed that will distinguishbetween competing theories to describe these observations using a non-invasive opticaltechnique called Forced Rayleigh Light Scattering. Results will necessarily distinguishbetween competing theories on the origins of the effect.The results of the study will have broad impact on the modeling of advanced materialscontaining plastic. While previous work showed how temperature modeling of theseliquids requires an additional complexity, it also suggested that this complexity couldbe easily modeled through use of a simple relation to stress which is typically calculatedalready. The current work, if successful, should determine if similar principlesapply to the solid polymer during cooling.Secondly, as part of the project, a display explaining the key optical technique employedwill be provided to the Holography Museum in Chicago. Visitors will learn thatholography is used to study material properties, and how the technique is employed.

技术摘要：提出了一种固体聚合物各向异性导热系数起源的实验研究.特别地，寻求聚合物的分子结构与所得宏观性质之间的关系。已经确定的是：（1）变形的交联弹性体表现出各向异性的热导率张量k（2）对于处于相同状态的聚合物，张量k与额外应力张量线性相关，以及（3）当适当地使其无量纲时，这两个量的关系常数显示出0.03的普适值，与所研究的少数系统的化学性质无关。在这项工作中，我们设计了一系列实验来区分不同的理论来描述这些观测结果。一种非侵入性的光学技术，称为强迫瑞利光散射，以检查新的材料状态。结果将必然区分影响的起源之间的相互作用理论。研究的结果将有广泛的影响，先进的含塑料材料的传输模型。虽然以前的工作表明，由于各向异性，液体的非等温建模需要额外的复杂性，但它也表明，这种复杂性可以通过使用与应力的现象学关系轻松建模。目前的工作，如果成功的话，应确定是否similarprinciples适用于固体聚合物在cooling.Non-Technical摘要：一个实验研究的起源如何热流differentdirections固体聚合物，如塑料，提出。特别是，分子的行为和由此产生的热流性质之间的关系正在寻找。在这项工作中，设计了一组实验，这些实验将在相互竞争的理论之间进行竞争，以使用称为强迫瑞利光散射的非侵入性光学技术来描述这些观测结果。结果将必然会在相互竞争的理论之间的影响的起源。研究的结果将有广泛的影响，先进材料的建模包含塑料。虽然以前的工作表明这些液体的温度建模需要额外的复杂性，但它也表明这种复杂性可以通过使用与应力的简单关系轻松建模，而应力通常已经计算过。目前的工作，如果成功的话，应该确定类似的原理是否适用于冷却过程中的固体聚合物。其次，作为该项目的一部分，一个解释所采用的关键光学技术的展览将提供给芝加哥的全息博物馆。参观者将了解到拓扑学是用来研究材料特性的，以及如何使用这种技术。