Segment Density and Coil Dimensions of Polymer Chains Anchored to Solid Surfaces

锚定到固体表面的聚合物链的链段密度和线圈尺寸

• 批准号: 68116649
• 负责人: Professor Dr. Matthias Rehahn
• 金额: --
• 依托单位: Helmholtz-Zentrum hereon GmbH
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/68116649?language=en
• 关键词: Segment; Density; Coil; Dimensions; Polymer

Polymers being in direct contact with solid surfaces form interphases in which the chain segments assume shapes and segment density profiles different from those in the bulk. These interface-induced effects, their extent and location depend on parameters such as number, architecture, rigidity, and molar mass of the chains next to the solid surface. It is the aim to develop profound knowledge about this interphase, and of its consequences for the material properties, via site-resolved analysis of the segment conformation of surface-anchored polymer chains: well-defined polymers of different molar mass, constitution and architecture (linear, branched, amorphous, semi-crystalline) are synthesized, which are deuterated in specific chain segments only (“H/D block copolymers”). These chains will be immobilized on planar and bent solid substrates, thereby covering the full accessible range of grafting densities. The resulting polymer layers are analyzed when (i) in contact with air, (ii) in direct contact with each other, (iii) in contact with free polymer chains or (iv) with solvents, and (v) under strain and deformation, using neutron and X-ray small angle scattering and X-ray reflectomery. The gained insights can be used as input for simulation work, NMR and AFM studies, and will deepen understanding of the properties of polymer (nano)composites considerably.

与固体表面直接接触的聚合物形成界面，其中链段的形状和链段密度分布与本体中的链段不同。这些界面引起的效应、其程度和位置取决于数量、结构、刚性和结构等参数。其目的是通过对表面锚定聚合物链的链段构象进行位点解析分析，深入了解该界面及其对材料性能的影响：不同定义的聚合物合成摩尔质量、组成和结构（线性、支化、无定形、半结晶），仅在特定链段中进行氘化（“H/D 嵌段共聚物”），这些链将固定在平面和弯曲的固体基质上。从而在以下情况下对所得聚合物层进行分析：(i) 与空气接触，(ii) 彼此直接接触，(iii) 与自由聚合物链接触或(iv) 使用溶剂，以及 (v) 在应变和变形下，使用中子和 X 射线小角散射和 X 射线反射测量法。所获得的见解可用作模拟工作、NMR 和 AFM 研究的输入，并将深化。对聚合物（纳米）复合材料的性能有了相当大的了解。