Recearches On Preparation And Application Of Rare Earths/block Polymer Hybrid Materials

In recent years, more and more researches have been carried out on the application of amphiphilic polymers due to the special biological properties and controllable conditions of amphiphilic polymer synthesis. polyacetylene compounds have been found applications in the field of organic photoluminescence devices, etc. due to their conductivity, optical data storage, LCD display and light luminescence features. With the rapid development of optical information processing techniques, synthesis of organic optical materials with outstanding performance is becoming a hot spot of research all over the world. We incorporate azobenzene group into conjugated polyacetylene polymer, and two optical polyacetylenes are obtained.We synthesized three polymers. They are polystyrene-b-poly cinnamic acid-b-polystyrene, polystyrene propiolic acid, poly-6-(4-hydroxy-4’-methoxy benzene azo)-benzene propiolic acid ethyl-b-polystyrene propiolic acid. They are characterized by IR, NMR, GPC, UV-Vis spectra, etc. The self-assembly behaviors of these polymers in THF/H2O are investigated by TEM. We discuss the biological application of these polymers by fluorescence spectra and UV absorption spectroscopy. The main contents of this paper are divided as follows:1. An amphiphilic copolymer polystyrene-b-poly cinnamic acid-b-polystyrene was synthesized via reversible addition-fragmentation chain transfer. The products were characterized by1H-NMR, IR, GPC and UV-Vis spectroscopy. Self-assembly behaviors of this amphiphilic copolymer in THF/H2O (water content80vol%) were investigated. The binding interaction of PSt-b-PCA-b-PSt colloidal spheres with bovine serum albumin (BSA) was investigated by fluorescence spectra and UV absorption spectroscopy. The mechanism of fluorescence quenching was confirmed by static quenching. Tb(acac)3phen-doped PSt-b-PCA-b-PSt spheres were investigated by TEM and UV-Vis spectroscopy. It was found that Tb(acac)3phen was incorporated into polymers due to the coordination interaction between Tb(Ⅲ) and PSt-b-PCA-b-PSt.2. Polystyrene propiolic acid was synthesized. The products were characterized by ’H-NMR, IR, GPC and UV-Vis spectroscopy. Self-assembly behaviors of this amphiphilic copolymer in THF/H2O (water content80vol%) were investigated. The binding interaction of polystyrene propiolic acid colloidal spheres with bovine serum albumin (BSA) and folate-mediated polystyrene propiolic acid were investigated by fluorescence spectra and UV absorption spectroscopy. The results showed that the intrinsic fluorescence of BSA was quenched by FA/polystyrene propiolic acid. The mechanism of fluorescence quenching was confirmed by static quenching.3. Poly-6-(4-hydroxy-4’-methoxy benzene azo)-benzene propiolic acid ethyl b-polystyrene propiolic acid was synthesized. The products were characterized by1H-NMR, IR, GPC and UV-Vis spectroscopy. Different self-assembly behaviors of this amphiphilic copolymer in THF/H2O mixture with different water content were investigated. Investigation of photochromic behavior of the polymer suggests the mechanism of trans-cis was reversal mechanism. It was found that Tb(acac)3phen was incorporated into polymers due to the coordination interaction between Tb(Ⅲ) and poly-6-(4-hydroxy-4’-methoxy benzene azo)-benzene propiolic acid ethyl-b-polystyrene propiolic acid.