Preparetion And Properties Of Brush Block Copolymer Based On Polynorbornene

Brush block copolymer as a new type of polymer materials,It have many advantages,such as the molecular weight and its structure can be controlled,the preparation process is simple,and the structure is similar to one-dimensional photonic crystals.As the optical material,the brush-like block copolymer can be prepared into a material having photonic crystal properties by a self-assembling method in which the distance between the blocks can be changed to control the wavelength of the reflected light and the material of the different blocks can be made reflective Light intensity impact of the impact.Therefore,brush-like block copolymers have potential applications in photonic crystal materials research.In this dissertation.The main methods include ring-opening polymerization,atom transfer radical polymerization and ring-opening metathesis polymerization.Theirspecial structures of(PNB-PS)-b-(PNB-PLA)and(PNB-PMMA)-b-(PNB-PLA)were synthesized by those method.Its structure was characterized by Fourier transform infrared spectroscopy(FT-IR),nuclear magnetic resonance spectroscopy(1H NMR)and gel permeation chromatography(GPC),which proved to be a block copolymer with brush-like structure.The copolymers can self-assemble into products with reflective properties.In this paper,the thermodynamics and optical properties of the self-assembled brush-like block copolymers were investigated.The results show that the self-assembly process of the two brush-like block copolymers is simple,the self-assembled structure is similar to the one-dimensional photonic crystal,the crystallization temperature is 107 ? and 116 ?,respectively,and the strongest reflection wavelength is 627 nm And 666 nm with the other reflection wavelengths,and the stability of self-assembled product is good.(PNB-PS)-b(PNB-PLA)and(PNB-PMMA)-b-(PNB-PLA)are good optical materials,and have the following properties in photonic crystal: Potential application value.