Molecular Rheology of Miscible Polymer Blends

本研究是一项实验和理论研究， 不同聚合物共混物的粘弹性能 纠缠流体状态 二元共混物将首先由以下物质制备： 表征良好的窄分子量线性聚丁二烯 分布和可变的微观结构。 杂聚物 这些混合物的特性将通过增加 参与者中乙烯基含量的差异 件. 动态-振荡，稳态-剪切，拉伸，和步进- 应变实验将用于检查线性和 这些系统在几个温度下的非线性粘弹性 as a function函数of composition组成. 流动性，弹性， 因此，共混物的刚性将与相应的 其纯成分的性质。 商业聚合物的共混物 还将进行调查，以检验是否得出的结论， 模型聚合物混合物适用于工业上感兴趣的情况。 特别强调的是， 由强特异性相互作用的存在驱动。 一 分子理论已经发展来解释复合网络 互溶杂聚物的结构与分子动力学 混合将被扩展以适应非理想行为。 这项研究是更好地了解 不同聚合物的混合行为。 粒子的结果将是 更有效地处理再生塑料，这些塑料通常 混合物。

This research is an experimental and theoretical study on the viscoelastic properties of blends of dissimilar polymers in the entangled fluid state. Binary blends will first be prepared from well-characterized linear polybutadienes of narrow molecular-weight distribution and variable microstructure. The heteropolymer character of these mixtures will be controlled by increasing the disparity of the vinyl group content in the participating components. Dynamic-oscillatory, steady-shear, tensile, and step- strain experiments will be utilized in examining the linear and nonlinear viscoelasticity of these systems at several temperatures as a function of composition. The fluidity, elasticity, and rigidity of a blend will thus be related to the corresponding properties of its pure constituents. Blends of commercial polymers will also be investigated to test whether the conclusions drawn on model polymer mixtures apply to cases of commerical interest. Especial emphasis will be given on blends where miscibility is driven by the presence of strong specific interactions. A molecular theory already developed to explain the composite network architecture and molecular dynamics in miscible heteropolymer blends will be extended to accommodate non-ideal behavior. This research is part of a general format to understand better the mixing behavior of dissimilar polymer. A particle outcome would be more efficient processing of recycled plastics, which are typically mixtures.