Synthesis And Performance Research Of Fluorinated Block Copolymer Of Methacrylate Based On RAFT Polymerzation

Fluorinated acrylate monomers have been widely applied in many fields especially in synthesis of copolymers with special property.The reason why fluorinated acrylate monomers can be widely used on the one hand is because the introduce of fluorine brings the proper property of fluorinated polymer such as excellent heat resistance good aging resistance and low surface energy;on the other hand the exist of acrylate give monomer the property of acrylate such as good formability and strong stickiness and easy to copolymerization with other monomers.Copolymerization of fluorinated acrylate monomers using conventional free radical polymerization can easily lead to chain transfer and chain termination and obtain the product that can not be well designed.Due to these reasons the conventional free radical polymerization has been restricted.Since the development of the controlled radical polymerization,the synthesis of well-defined polymers has been widely reported with a better control of molecular weights.The RAFT(Reversible Addition-Fragmentation chain Transfer)process is a versatile method for providing unprecedented control over molecular weight,molecular weight distribution,composition and architecture.It is suitable for most monomers and is robust under a wide range of reaction conditions.The RAFT method carries out by introducing reagents in conventional free radical polymerization as chain transfer agent to control the polymerization of monomer.It provides a route to functional polymers,combtypepolymers,graft copolymers,block polymers and star polymers because of the structure of chain transfer agent.Based on the RAFT polymerization of block polymer of fluorinated acrylate,the review studies the related monomer synthesis of block polymer via RAFT polymerization and the structure and properties of polymer.The contents of the paper are as follows:The paper selects CDB dithio acid cumyl ester as chain transfer agent and finish preparation.The structure of the chain transfer agent are characterized byIR and NMR and the purity of the chain transfer agent are characterized by liquid chromatography.Make sure the product is exactly what we need by these detections.The block polymer of trifluoroethyl methacrylate and methyl methacrylate P(MMA-b-TFEMA)is synthesized by two-step RAFT method using CDB as chain transfer agent.FT-IR spectrascopy and ~1H NMR spectra are carried out to conform the structure of product and the molecular weight and molecular weight distribution are tested by GPC and ~1H NMR.The molecular weight tested by GPC is consistent with theory molecular weight and molecular weight distribution is fairly narrow which is in according with the characteristics of living controllable polymerization.Some other properties of the polymer are characterized such as thermo property tested by DSC and TGA;surface property tested by Contact Angle Meter;optical property tested by abbe refractometer.The self-assembly behavior of polymer is studied as well.Two-step RAFT method with CDB as chain transfer agent in Supercritical Carbon Dioxide synthetize block polymer of trifluoroethyl methacrylate and styrene P(TFEMA-b-St).The structure is tested by FT-IR spectrascopy and ~1H NMR spectra and the the molecular weight and molecular weight distribution are tested by GPC.The result of the molecular weight and its distribution is in agreement with the theory value which indicates the existence of living controllable polymerization.As above the properties of polymer are tested to characterize its thermo property,surface property and structure.