Comparative Molecular Adhesion Studies of Polyacrylic Acids on ZnO Single Crystal Surfaces and ZnO Nanocrystalline Films

聚丙烯酸在 ZnO 单晶表面和 ZnO 纳米晶薄膜上的分子附着力比较研究

• 批准号: 320414069
• 负责人: Professor Dr.-Ing. Guido Grundmeier
• 金额: --
• 依托单位: Arbeitskreis Technische und Makromolekulare Chemie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/320414069?language=en
• 关键词: Comparative; Molecular; Adhesion; Studies; Polyacrylic

The proposal addresses the topic of the comparative adhesion of macromolecules onto zinc oxide monocrystalline surfaces and onto technologically relevant nanocrystalline zinc oxide layers. The fundamental aim of this project is the analysis of the interfacial forces and chemistry between polyacrylic acids and zinc oxide surfaces in aqueous electrolytes by means of single molecule force spectroscopy. Beside van-der-Waals forces, such interfacial forces comprise electrostatic interactions, hydrogen bonds and coordinative bonds. Their strength is influenced by the orientation of the crystal surface, its termination, the nature of the adsorbate layer and the electric double layers of the acrylic acid and the crystal surface. The analysis of these interfacial interactions should allow for the understanding of microscopic and macroscopic adhesion processes between polymers with carboxylic acids and zinc oxide or zinc oxide-coated substrates. These adhesion processes are of great importance for the functionality and stability of ZnO-based composite materials and polymer-coated zinc alloys under ambient and corrosive conditions. To gain a fundamental understanding of such interface processes, polar and nonpolar ZnO single crystals will be studied: they allow for a detailed analysis of the surface termination and at the same time are stable under the ambient conditions relevant for interface stability in electrolytes. The surface chemistry of ZnO substrates will be characterised by ex-situ electron diffraction (LEED) and X-ray photoelectron spectroscopy (XPS); surface topography and surface charge will be analysed in-situ by means of scanning Atomic Force Microscopy (AFM). The interaction of the polyacrylic acid at the electrolyte/oxide interface will be investigated by means of single molecule force spectroscopy using PEG-linkers as a function of the surface chemistry and the electrolyte composition. Moreover, the influence of specific adsorbed anions on the adsorption/desorption behaviour of the macromolecules as a function of different crystallographic orientations will be studied in order to understand the adhesion of acrylic acid-containing polymers to zinc oxide in corrosive environments. Similar studies performed on nanocrystalline ZnO-nanowire layers should additionally allow for a comparison of the pure chemisorption of the macromolecule with the immobilisation of the macromolecule in the confined gaps between the ZnO rod. From these studies we aim at gaining fundamental understanding and prediction of interfacial binding processes at polymer/oxide interfaces in aqueous electrolytes.

该提案解决了大分子在氧化锌单晶表面和技术相关的纳米氧化锌层上的比较粘附的主题。本项目的基本目的是利用单分子力谱分析水溶液中聚丙烯酸和氧化锌表面之间的界面力和化学性质。除范德华力外，这种界面力还包括静电相互作用、氢键和配位键。它们的强度受晶体表面的取向、终止、吸附层的性质以及丙烯酸与晶体表面的电双层的影响。对这些界面相互作用的分析应该允许理解聚合物与羧酸和氧化锌或氧化锌涂层衬底之间的微观和宏观粘附过程。这些粘附过程对于zno基复合材料和聚合物包覆锌合金在环境和腐蚀条件下的功能和稳定性具有重要意义。为了获得对这种界面过程的基本理解，极性和非极性ZnO单晶将被研究：它们允许对表面终止进行详细分析，同时在与电解质界面稳定性相关的环境条件下是稳定的。采用非原位电子衍射（LEED）和x射线光电子能谱（XPS）表征ZnO衬底的表面化学性质；表面形貌和表面电荷将通过扫描原子力显微镜（AFM）进行原位分析。通过单分子力谱研究聚丙烯酸在电解质/氧化物界面上的相互作用，使用peg连接剂作为表面化学和电解质组成的函数。此外，为了了解含丙烯酸聚合物在腐蚀性环境中对氧化锌的粘附作用，将研究特定吸附阴离子对大分子吸附/解吸行为的影响，作为不同晶体取向的函数。在纳米晶ZnO-纳米线层上进行的类似研究还应该允许对大分子的纯化学吸附与大分子在ZnO棒之间的受限间隙中的固定进行比较。从这些研究中，我们的目标是获得对水性电解质中聚合物/氧化物界面结合过程的基本理解和预测。

项目成果

Spray coating of poly(acrylic acid)/ZnO tetrapod adhesion promoting nanocomposite films for polymer laminates

• DOI: 10.1016/j.surfcoat.2019.06.083
• 发表时间: 2019-06
• 期刊: Surface and Coatings Technology
• 影响因子: 5.4
• 作者: D. Meinderink;Karlo Nolkemper;Julius Bürger;A. Orive;J. Lindner;G. Grundmeier

Dependance of Poly(acrylic acid) Interfacial Adhesion on the Nanostructure of Electrodeposited ZnO Films

• DOI: 10.1021/acsanm.8b02091
• 发表时间: 2019-02-01
• 期刊: ACS APPLIED NANO MATERIALS
• 影响因子: 5.9
• 作者: Meinderink, Dennis;Orive, Alejandro Gonzalez;Grundmeier, Guido
• 通讯作者: Grundmeier, Guido

Electrodeposition of poly(acrylic acid) on stainless steel with enhanced adhesion properties

• DOI: 10.1002/sia.6440
• 发表时间: 2018-11
• 期刊: Surface and Interface Analysis
• 影响因子: 1.7
• 作者: D. Meinderink;A. Orive;G. Grundmeier

Electropolymerization of acrylic acid on carbon fibers for improved epoxy/fiber adhesion

• DOI: 10.1016/j.surfcoat.2017.04.039
• 发表时间: 2017-07-15
• 期刊: SURFACE & COATINGS TECHNOLOGY
• 影响因子: 5.4
• 作者: Bauer, Andreas;Meinderink, Dennis;Grundmeier, Guido
• 通讯作者: Grundmeier, Guido