Near surface dynamics of layers of non-cross-linked and cross-linked polymer architectures at solid planar surfaces

固体平面上非交联和交联聚合物结构层的近表面动力学

• 批准号: 290879244
• 负责人: Dr. Olaf Holderer
• 金额: --
• 依托单位: Arbeitsgruppe Angewandte Physikalische 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/290879244?language=en
• 关键词: Near; surface; dynamics; layers; non

The proposed project addresses the inner dynamics of polymer matrices of different molecular architecture in the presence of solid planar substrate. Functionalisation of solid surfaces by coating them with thin polymer films has a large impact for e.g. controlled drug release, lubrication and sensorics. In order to design new coatings knowledge about the internal structure and dynamics is essential. This offers a deeper understanding of the interaction between the polymer chains themselves, under the influence of cross-linking, with additive like in hybrid systems (drug release, sensorics) or with other surfaces (lubrication). While the structure of many of these polymer systems has been already extensively studied not much is known about their dynamics when attached to surfaces, and the proposed project will contribute to close this gap of knowledge. The project focuses on the effect of geometrical confinement on the dynamics of polymer in thin films either close to one solid interface or between two solid interfaces. Two different polymer architectures prepared on Silicon surfaces will be investigated: polymer brushes, cross-linked polymer brushes, thin hydrogel layers and adsorbed microgel particles. All types will be prepared with stimuli responsive polymers and apart from the cross-linkers the chemical composition will be the same. Dynamics profiles within different polymer architectures perpendicular to the confining surface will be determined by grazing incidence neutron spin echo spectroscopy (GINSES). Thereby, a better understanding of chain dynamics and collective dynamics of polymer architectures in a solvent close to a solid interface will be achieved. To explore the relation between dynamics, structure and mechanical properties results on the dynamics will be linked to experiments on the structure (neutron-, x-ray reflectometry, SANS, GISANS, light scattering, AFM, ellipsometry) and viscoelastic properties (AFM indentation, QCM-D). In the case of opposing surfaces and brushes a direct in-situ and contactless investigation using neutron scattering techniques will gain insight into the hydrodynamics and effects of compression and interpenetration on the chain and collective dynamics at different separation distances. The influence of rigid interfaces on the polymer dynamics and mechanics will be studied as a function of size parameters and composition (cross-linker and comonomer content).The proposed project will benefit from the strong synergy of expertise of the two groups from TU Berlin and from JCNS@MLZ. The common expertise includes synthesis, sample preparation, technical knowledge over a large variety of techniques, extension of scattering techniques (e.g. GINSES) and data analysis. The project is designed for a PhD student with an anticipated time of three years located at the TU Berlin and a Post-doc position of two years located at the JCNS outstation at the Maier-Leibnitz Zentrum in Garching.

该项目旨在研究固体平面基质中不同分子结构的聚合物基质的内部动力学。通过用薄聚合物膜涂覆固体表面来使其功能化对例如受控药物释放、润滑和传感器具有很大的影响。为了设计新的涂层，有关内部结构和动力学的知识是必不可少的。这提供了对聚合物链本身之间的相互作用的更深入的理解，在交联的影响下，与混合系统中的添加剂（药物释放，传感器）或与其他表面（润滑）。虽然许多这些聚合物系统的结构已经被广泛研究，但当它们附着在表面上时，对其动力学知之甚少，拟议的项目将有助于缩小这一知识差距。该项目的重点是在薄膜中的聚合物的动力学的几何约束的影响，无论是接近一个固体界面或两个固体界面之间。两种不同的聚合物结构上制备的硅表面将进行研究：聚合物刷，交联聚合物刷，薄的水凝胶层和吸附的微凝胶颗粒。所有类型将用刺激响应聚合物制备，并且除了交联剂之外，化学组成将是相同的。垂直于约束表面的不同聚合物结构内的动力学剖面将通过掠入射中子自旋回波谱（GINSES）来确定。从而，更好地理解链动力学和集体动力学的聚合物结构在溶剂中接近固体界面将实现。为了探索动力学，结构和力学性能之间的关系，动力学结果将与结构（中子，X射线反射计，SANS，GISANS，光散射，AFM，椭圆偏振）和粘弹性性能（AFM压痕，QCM-D）的实验联系起来。在相对的表面和刷子的情况下，使用中子散射技术的直接原位和非接触式调查将深入了解流体动力学和压缩和相互渗透对链和集体动力学的影响，在不同的分离距离。刚性界面对聚合物动力学和力学的影响将作为尺寸参数和组成（交联剂和共聚单体含量）的函数进行研究。拟议的项目将受益于来自柏林工业大学和JCNS@MLZ的两个小组的专业知识的强大协同作用。共同的专业知识包括合成，样品制备，各种技术的技术知识，散射技术的扩展（例如GINSES）和数据分析。该项目是专为博士生与位于柏林工业大学的预期时间为三年，并在位于加尔兴迈尔-莱布尼茨Zentrum的JCNS分站的两年博士后位置。

项目成果

A grazing incidence neutron spin echo study of near surface dynamics in p(MEO2MA-co-OEGMA) copolymer brushes

p(MEO2MA-co-OEGMA) 共聚物刷近表面动力学的掠入射中子自旋回波研究

• DOI: 10.1007/s00396-018-4421-9
• 发表时间: 2018
• 期刊: Colloid and Polymer Science
• 影响因子: 2.4
• 作者: Wellert;Hübner;Boyciyan;Ivanova;von Klitzing;Soltwedel;Holderer
• 通讯作者: Holderer

Inner structure and dynamics of microgels with low and medium crosslinker content prepared via surfactant-free precipitation polymerization and continuous monomer feeding approach.

无表面活性剂沉淀聚合和连续单体进料方法制备的低和中等交联剂含量微凝胶的内部结构和动力学

• DOI: 10.1039/c9sm01161g
• 发表时间: 2019
• 期刊: Soft matter
• 影响因子: 3.4
• 作者: Feoktystov;Pipich;Pasini;Radulescu;Kruteva;von Klitzing;Wellert;Holderer
• 通讯作者: Holderer

Simpler neutron resonator enhances the wave-field for grazing incidence scattering experiments with lower parasitic scattering

更简单的中子谐振器增强了掠入射散射实验的波场，并具有较低的寄生散射

• DOI: 10.1016/j.physb.2018.07.022
• 发表时间: 2018
• 期刊: Physica B: Condensed Matter
• 作者: Gavaramia;Kotsioubas;Mattausch;Wellert;Holderer;Frielinghaus
• 通讯作者: Frielinghaus

Grazing incidence SANS and reflectometry combined with simulation of adsorbed microgel particles

掠入射 SANS 和反射计与吸附微凝胶颗粒模拟相结合

• DOI: 10.1016/j.physb.2018.03.049
• 发表时间: 2018
• 期刊: Physica B: Condensed Matter
• 作者: KyreyT;Ganeva;Gawlitza;von Klitzing;Soltwedel;Wellert;Holderer
• 通讯作者: Holderer

A comparison of the network structure and inner dynamics of homogeneously and heterogeneously crosslinked PNIPAM microgels with high crosslinker content.

高交联剂含量均相和非均相交联 PNIPAM 微凝胶的网络结构和内部动力学比较

• DOI: 10.1039/c8sm02141d
• 发表时间: 2019
• 期刊: Soft matter
• 影响因子: 3.4
• 作者: Lutzki;Houston;Radulescu;Pipich;Stingaciu;Kühnhammer;von Klitzing;Holderer;Wellert
• 通讯作者: Wellert