Synthesis of covalently cross-linked amphiphilic co-networks with model character

该项目的主题是共价交联的模型特征（模型ACN）的两亲共网络，它是通过不同亲性的四臂星的各种异质互补反应获得的。在该项目中，将研究反应基团的相互作用或交联过程中形成的连接在多大程度上影响反应的进一步过程，从而影响网络的微观结构。特别是，人们怀疑在存在强相互作用的情况下会发生反应统计过程的偏差，这可能导致与文献中描述的其他 ACN 相比微观结构的偏差。选择连接反应以涵盖广泛的可能的相互作用。在酯键的情况下，往往会发生弱相互作用，而共价离子键则预计会发生强相互作用。一种特殊情况是由可逆第尔斯-阿尔德反应产生的网络。这种网络将用于研究反应引起的动态重排对 ACN 微观结构的影响程度。合成过程中结构形成的另一个方面是疏水性和亲水性组分的相互作用，这可能导致相分离，从而导致网络的预结构化。在这方面，设想使用具有亲水核和疏水侧翼的星形嵌段共聚物作为合成ACN的起始材料。在这种方法中，使用选择性溶剂可能会导致核心的塌陷，这会对网络结构产生重大影响。主要目标是更好地理解网络合成过程中结构决定的影响，这是合成具有最少网络缺陷的模型 ACN 的先决条件。与综合相关的结构对网络形成的影响的评估将基于对链连通性和网络移动性、网络拓扑和渗透性以及网络力学和流变学的研究，这些都是研究组内部合作的范围。由理论导向的项目合作伙伴提供的建模结构-性能相关性在此充当评估标准。

The subject of the project are covalently cross-linked amphiphilic co-networks of model character (model ACN), which are obtained by various hetero-complementary reactions of 4-arm stars of different philia. In this project, the question of the extent to which interactions of the reacting groups or the linkages formed during the cross-links influence the further course of the reaction and thus the microstructure of the networks will be investigated. In particular, it is suspected that deviations from the statistical course of the reaction occur in the presence of strong interactions, which may lead to deviations in the microstructure compared to other ACNs described in the literature. The linkage reactions are selected to cover a wide range of possible interactions. In the case of ester linkages, weak interactions should tend to occur, while strong interactions are expected for covalent-ionic linkages. A special case is represented by networks which are produced by a reversible Diels-Alder reaction. Such networks will be used to investigate the extent to which reaction-induced dynamic rearrangements affect the microstructure of ACNs. Another aspect of structure formation during synthesis are interactions of the hydrophobic and hydrophilic components, which can lead to phase separation and thus to pre-structuring of the networks. In this context, the use of star block copolymers with hydrophilic core and hydrophobic wings as starting materials for the synthesis of ACNs is envisaged. In this approach, collapse of the core can be caused by the use of selective solvents, which should have a significant impact on the network structure. The main goal is a better understanding of the structure-determining influences during network synthesis, as a prerequisite for the synthesis of model ACNs with a minimum of network defects. The evaluation of synthesis-related structural influences on the network formation will be based on investigations of chain connectivity and network mobility, network topology and permeability as well as network mechanics and rheology, which are covered by cooperation within the research group. Modelled structure-property correlations, which are provided by the theoretically oriented project partners, serve as evaluation criteria here.