Preparation And Properties Of Functional Materials From Optic Ally Active Helical Substituted Polyacetylenes

As a typical helical polymer,helical substituted polyacetylenes can form predominantly one-handed dynamic helical structure under certain conditions,exhibiting remarkable optical activity and "chiral amplification effect".Optically active helical substituted polyacetylenes have attracted great attention owing to their great application prospect in chiral recognition,chiral separation and asymmetric catalysis.Meanwhile,because of the unique conjugated backbone structure,helical substituted polyacetylenes have other great potential applications,including biomimetic chemistry,liquid crystal display materials,and biomedicine.However,the rigid backbone of polyacetylene results in poor dispersibility,processing performance and thermal stability,which heavily limits the practical applications of polyacetylene.At present,there have been many studies on the preparation and chiral applications of helical substituted polyacetylenes and their derivatives.However,the types of such helical substituted polyacetylene are still less,and there are few reports on the use of helical substituted polyacetylenes to construct novel functional materials.In this paper,two different polyacetylene functional materials were prepared based on two kinds of propargylamide helical substitution polyacetylenes.The main research contents are as follows:1.Using graphene as a dispersant instead of routine disperants,two kinds of chiral polyacetylene/graphene hybrid microspheres were prepared by suspension polymerization.The morphology of the hybrid microspheres was characterized by SEM.The chemical composition of the hybrid microspheres,the distribution of graphene in the two microspheres,and the combination of graphene and polymer chains were characterized by means of EDS,FT-IR,XPS,and Raman techniques.The thermal property and optical activity of the hybrid microspheres were characterized by TGA and CD and UV-vis absorption spectra.It was confirmed that the graphene sheets were combinted with the chiral polyacetylene through physical or chemical interaction.T resulting chiral polyacetylene/graphene hybrid microspheres showed remarkable optical activity.2.A new type of propargylamide-type circularly polarized luminescent substituted acetylene monomer and its homopolymer were designed and synthesized,and a polyacetylene/PVB composite film with circular polarization performance was further prepared.The chemical structures of the synthesized monomers and polymers were characterized by FT-IR and NMR.The fluorescence properties and chirality of the monomers,polymers and composite films were characterized by fluorescence,CD and UV-vis absorption spectra.The circularly polarized luminescent properties of the monomers,polymers,and composite films were confirmed by CPL spectra.