Research On Macroscopic Supramolecular Assembly Promoted By Microgel Flexible Spacing Coating

Macroscopic supramolecular assembly is an emerging research direction in supramolecular science.After nearly ten years of rapid development,it has become a new method for constructing bulk supramolecular materials.Surface chemical modification introduces supramolecular recognition groups and then uses interface assembly to construct supramolecular materials.In the preliminary research of macroscopic supramolecular assembly,it was found that the excellent deformation ability of macroscopically constructed primitive materials is the key to its assembly.Therefore,many related reports mainly use material systems with low moduli,such as hydrogels.How to realize the assembly of rigid materials is a significant difficulty in this research field.Although the strategy of introducing high-fluidity and low-modulus coatings on the surface of rigid materials has been developed,the "flexible spacing coating" can effectively enhance supramolecular functional groups' activity on the macroscopic surface and promote assembly;however,it can be used as a flexible spacer.The layer material system is limited,and currently,there is only one type of polyelectrolyte multilayer film or hydrogel coating.To broaden the application of the flexible spacing coating,this paper proposes a method of constructing polyelectrolyte/microgel multilayer films on the surface of rigid materials using alternating layer assembly technology.At the same time,flexible spacers and intermolecular interactions are introduced to promote macroscopic supramolecular assembly.Broaden the material system suitable for assembly.The innovative research results are as follows:1.We designed and prepared P(NIPAM-AA)microgel with a particle size of 527±7 nm and a surface potential of-18.9 mV by using isopropyl acrylamide and acrylic acid-free radical copolymerization method.Then we use various characterization methods to study its morphology,size,temperature response,and other properties,which laid the foundation for the construction of polyelectrolyte multilayer films.2.We constructed the poly ally lamine hydrochloride and P(NIPAM-AA)microstructure on the surface of the polydimethylsiloxane(PDMS)building element by alternate layered assembly technology(Layer-by-layer,LbL).The gel multilayer film improves the surface deformability of PDMS and realizes efficient macroscopic supramolecular assembly.By changing the number of layers of the LbL microgel multilayer film,combined with the quantitative interface force characterization,we preliminarily established the relationship between the thickness of the microgel flexible spacer layer and the macroscopic assembly probability.