The Fabrication Of The Fluorescent Nano-Material Based On Polymerization-induced Self-assembly

Nanomaterial with various morphologies could be fabricated by macromolecular self-assembly process.Diversiform monomer could be used in this process to prepare processable and stable materials.Thanks for that,macromolecule self-assembly is researched widely in materials science,nanoscience and medical engineering fields.The self-assembly process of block copolymers is the most representative one.Compared with the traditional self-assembly process,the polymerization-induced self-assembly(PISA)process realizes the in-situ copolymers self-assembly during the polymerization,which is an efficient and convenient method to prepare self-assembly nano materials.The fast-growing controlled living radical polymerization provides convenience to prepare block copolymers with controllable molecular weight and narrow molecular weight distribution.Among them,the reversible addition-fragmentation chain transfer(RAFT)polymerization plays an important role.RAFT has many advantages,such as wide range of monomers,mild conditions and so on.Here we use N-(2-hydroxypropyl)methacrylamide and 2-hydroxypropyl methacrylate prepared an amphiphilic deblock copolymer PHPMAA-b-PHPMA via an aqueous RAFT polymerization.Copolymer self-assembly was fabricated by a PISA process.The relationship between the morphology of self-assembly and the composition of copolymer was discussed,and the result was verified by hydrophilic mass fraction equation.Then we modified the chain transfer agent with coumarin to get a fluorescent chain transfer agent.A fluorescent copolymer was prepared utilizing the fluorescent chain transfer agent via RAFT polymerization,and the copolymer self-assembly was prepared by a PISA process in the same time.Then we got a fluorescent self-assembly nanomaterial.We investigated the relationship between the morphology of self-assembly and the fluorescent property.Because the self-assembly of PHPMAA-b-PHPMA was sensitive to temperature,we tried to tuned the fluorescent property by heating or cooling.Finally,we got a temperature sensitive fluorescent nanomaterial.