Phase Segregation in Multicomponent Polymer Mixtures

小行星9807601 该基金支持多组分聚合物混合物中相分离的理论研究。 聚合物共混物是高度不混溶的粘性流体。 在分解成多个相的过程中观察到复杂的微观结构。 预计分解液的模式会受到流动的影响。 在这里，将进行一个系统的研究，作为共混物组分的浓度和聚合度的函数的分解过程中的流体动力学效应，以及它们的净排斥相互作用。 共混物分解成两个和三个阶段将进行分析。 水平集理论将用于分析界面行为。 还将研究外部施加流动下与时间相关的微观结构。 初步结果表明，在三元共混物中发现的互联模式的破碎是强烈的非线性。 也就是说，在多数对称相的界面处生长的富含少数组分的第三相形成连接流体丝，该连接流体丝分裂成具有卫星液滴的母液滴。 这种机制极大地影响了少相的生长速率。 该基金支持多组分聚合物混合物中相分离的理论研究。 聚合物共混物是高度不混溶的粘性流体。 大多数市售聚合物实际上是共混物。 在分解成多个相的过程中观察到复杂的微观结构。 这些微观结构影响共混物的性能。 预计分解液的模式会受到流动的影响。 在这里，将进行一个系统的研究，作为共混物组分的浓度和聚合度的函数的分解过程中的流体动力学效应，以及它们的净排斥相互作用。 ***

9807601 Olvera This grant supports theoretical research on phase segregation in multicomponent polymer mixtures. Polymer blends are highly immiscible viscous fluids. Complex microstructures are observed during the decomposition into multiple phases. The patterns of the decomposing fluids are expected to be affected by flow. Here a systematic study will be conducted of hydrodynamic effects on the decomposition process as a function of the concentrations and degrees of polymerization of the blend components, as well as of their net repulsive interactions. Blends decomposing into two and three phases will be analyzed. Level set theory will be used to analyze interface behavior. The time-dependent microstructures under externally applied flow will also be studied. Preliminary results suggest that the break-up of the interconnected patterns found in ternary blends is strongly nonlinear. That is, the third phase rich in the minority component growing at the interfaces of the majority symmetric phases forms connecting fluid filaments that break up into mother drops with satellite droplets. This mechnaism greatly affects the growth rate of the minority phase. %%% This grant supports theoretical research on phase segregation in multicomponent polymer mixtures. Polymer blends are highly immiscible viscous fluids. Most commercially available polymers for applications are actually blends. Complex microstructures are observed during the decomposition into multiple phases. These microstructures affect the properties of the blends. The patterns of the decomposing fluids are expected to be affected by flow. Here a systematic study will be conducted of hydrodynamic effects on the decomposition process as a function of the concentrations and degrees of polymerization of the blend components, as well as of their net repulsive interactions. ***