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.

聚合物直接与固体表面接触形成链段的相互作用，其中链段假设形状和分段密度曲线与整体不同。这些界面引起的效果，它们的范围和位置取决于参数，例如固体表面旁边的链的数字，结构，刚性和摩尔质量。它的目的是通过对表面锚定的聚合物链的片段构象进行站点分解的分析：不同定义的摩尔质量，构型和结构（线性，分支，分支，无态，半晶状体）是在deutthers seggiped（derthers Seggiped of Chait Herther）中，旨在通过对表面锚定的聚合物链的段构象进行站点分析的段构象的分析来发展有关材料属性的深刻知识及其对材料特性的影响。共聚物”）。这些链将被固定在平面和弯曲固体基材上，从而涵盖了完全可访问的嫁接密度范围。当（i）与空气接触时，分析所得聚合物层，（ii）彼此直接接触，（iii）与自由聚合物链接触或与溶液接触，以及（iv）在应变和变形下（v）使用中性和X射线的小角度散射和X射线反射组。获得的见解可以用作模拟工作，NMR和AFM研究的输入，并将仔细地仔细地了解聚合物（NANO）复合材料的性质。