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

该项目的主题是共价交联的两亲性共网络的模型字符（模型ACN），这是通过不同的philia的4臂星的各种异源互补反应获得的。在本项目中，将研究反应基团或交联过程中形成的键的相互作用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，它是怀疑的反应的统计过程中发生的偏差，在强相互作用的存在下，这可能会导致偏差的微观结构相比，在文献中描述的其他ACN。选择连接反应以覆盖广泛的可能相互作用。在酯键的情况下，弱相互作用应倾向于发生，而共价-离子键预期强相互作用。一个特殊的情况是由可逆的狄尔斯-阿尔德反应产生的网络。这样的网络将被用来调查在何种程度上反应诱导的动态重排影响的微观结构的ACN。合成过程中结构形成的另一个方面是疏水和亲水组分的相互作用，这可能导致相分离，从而导致网络的预结构化。在这种情况下，设想使用具有亲水核和疏水翼的星星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的坍塌，这对网络结构会产生重大影响。我们的主要目标是更好地了解网络合成过程中的结构决定的影响，作为一个先决条件，以最小的网络缺陷的模型ACN的合成。对网络形成的合成相关结构影响的评估将基于对链连接性和网络流动性、网络拓扑结构和渗透性以及网络力学和流变学的研究，这些研究由研究小组内部合作进行。由理论导向的项目合作伙伴提供的模型结构-性能相关性在此作为评估标准。

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.