Flow Morphology of Microphase-Separated Block Copolymers

微相分离嵌段共聚物的流动形态

• 批准号: 9111318
• 负责人: Faith Morrison
• 金额: $ 7.71万
• 依托单位: Michigan Technological University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-11-01 至 1994-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9111318&HistoricalAwards=false
• 关键词: Flow; Morphology; Microphase; Separated; Block

The aim of this research is to understand the flow mechanism of microphase-separated block copolymers in the strong-segregation limit (SSL). Microphase-separated block copolymers are chemically composite materials which play a prominant role in the formulation of many advanced materials. New material design requires an in- depth understanding of the physics of the component materials and of the interaction of their physics with processing. The research focusses on three tasks: First, they intend to observe directly the flow morphology of block copolymers in the SSL using small-angle neutron scattering. Second, they will do a comprehensive comparison between the rheological properties of samples with macroscopically ordered mesophases versus isotropic materials. Third, they will elucidate the impact of mesophase shape on linear-viscoelastic properties. Since microphase- separated block copolymers are very much like well-mixed incompatible polymer blends, the experiments performed will also bear on general questions in polymer thermodynamics, such as whether shearing a binary mixture can affect its phase diagram.

本研究的目的是了解流动机制， 微相分离嵌段共聚物 限制（SSL）。 微相分离的嵌段共聚物在化学上是 在配方中起澄清作用的复合材料 许多先进的材料。 新材料设计需要一个 深入了解组件材料的物理特性， 他们的物理学与处理过程的相互作用。 研究主要集中在三个方面：第一， 直接观察了嵌段共聚物在SSL中的流动形态 使用小角中子散射。 第二，他们会做一个 流变性能的综合比较 具有宏观有序的中间相与各向同性的样品 材料. 第三，他们将阐明中间相的影响 形状对线性粘弹性性质的影响。 微相以来- 分离的嵌段共聚物很像是混合均匀的 不相容的聚合物共混物，进行的实验也将 与聚合物热力学中的一般问题有关，例如 剪切二元混合物是否会影响其相图。