Evaluation of Phase Morphology and its Impact on the Viscoelastic Response of Elastomer Blends

该项目的重点是更深入地了解相分离过程之间的相关性，所产生的相形态和相关的粘弹性性能交联后的未填充和填充的弹性体共混物。一个主要目标是基于微观结构的建模和数值模拟的调幅分解与现实的物理输入参数从单独的相特定的测量。在这个框架中还将分析机械应力场对相形态的影响。另一个目标是基于详细的相形态，例如域和相间尺寸，填料分布和交联不均匀性，开发用于弹性体共混物的高频粘弹性响应的物理激励模型和模拟工具。该项目分别建立在两列数值和理论（OvGU，DIK）以及实验（DIK）调查的基础上。在这里，主要的注意力在于建立新的概念来描述填料增强弹性体共混物的复杂相行为。由于其物理动机和良好的实施数字工具，相场建模将是选择的方法。实验的重点在于评价的热力学聚合物-聚合物-和聚合物-填料的相互作用参数，支配的相形态和填料分布。此外，集体链的流动性估计从粘弹性和介电谱差的聚合物熔体，这是适应了一个完善的分子流变模型链蠕动纠缠聚合物熔体。

The project focuses on a deeper understanding of correlations between phase separation processes, the resulting phase morphology and related viscoelastic properties after crosslinking of unfilled and filled elastomer blends. One main objective is the microstructure based modelling and numerical simulation of spinodal decomposition with realistic physical input parameters obtained from separate phase-specific measurements. In this frame also the influence of mechanical stress fields on the phase morphology will be analysed. A further goal is the development of physically motivated models and simulation tools for the high-frequency viscoelastic response of elastomer blends based on the detailed phase morphology, e.g. domain and interphase size, filler distribution and crosslinking heterogeneities. The project is founded on two columns of numerical and theoretical (OvGU, DIK) as well as experimental (DIK) investigations, respectively. Herein, the main attention lies on the establishment of new concepts for describing the complex phase-behaviour of filler reinforced elastomer blends. Due to its physical motivation and the sound implementation into numerical tools, phase field modelling will be the method of choice. The experimental focus lies on the evaluation of thermodynamic polymer-polymer- and polymer-filler interaction parameters that govern the phase morphology and filler distribution. In addition, the collective chain mobility is estimated from viscoelastic and dielectric spectra of the poor polymer melts, which are adapted by a well-established molecular-rheological model of chain reptation in entangled polymer melts.