3 results about "Living polymerization" patented technology

The application discloses a self-toughening block copolymer underfill adhesive, a preparation method and application, and belongs to the technical field of microelectronic packaging materials. The method comprises the following steps: preparing a rigid chain segment A prepolymer; obtaining a flexible chain segment B; performing an active polymerization reaction on the rigid chain segment A prepolymer and the flexible chain segment B to obtain a block copolymer; performing purification treatment on the block copolymer to remove unreacted substances and a catalyst, thereby obtaining a self-toughening block copolymer resin; and obtaining the self-toughening block copolymer underfill adhesive from the self-toughening block copolymer resin. The application further discloses the self-toughening block copolymer underfill adhesive prepared by the above method and application thereof. The self-toughening block copolymer underfill adhesive prepared by the application can fundamentally eliminate the problems of poor compatibility, easy precipitation and viscosity increase of an external toughening agent, and has low viscosity, high T g , high toughness and excellent long-term reliability, and can be widely applied to the field of advanced semiconductor packaging.

This invention discloses a method for preparing cuprous oxide and multibranched polymer composite microcapsules. First, a prepolymer containing hydrophilic copper-complexing dimethylamino groups with epoxy end groups is synthesized using free radical living polymerization. Then, this prepolymer is condensed with polyamine molecules to prepare a multibranched block polymer, which is used as an additive in marine antifouling coatings. This additive polymer is blended with cuprous oxide nanoparticles, and based on the charge transfer effect between tertiary amines and copper, a composite microcapsule structure is formed, achieving encapsulation of copper antifouling agents. The advantages include effective control of copper antifouling agent release, while its multibranched structure increases the interaction force of the coating matrix resin, prolongs its residence time at the coating interface, and enhances the antifouling effect of the coating.

This invention discloses a selenium-thiolated RAFT reagent, its synthesis method, and its applications. The RAFT reagent is prepared by organic synthesis in the presence of selenium powder, sodium borohydride, carbon disulfide, and methyl 2-bromopropionate under an inert atmosphere. The RAFT reagent of this invention, as a chain transfer agent, is applied to the free radical polymerization of highly reactive acrylate monomers and less reactive styrene monomers, exhibiting living polymerization characteristics and good polymerization controllability. Selenides are used as regulators to synthesize organoselenium polymers with predetermined molecular weights, selenium content, and functional groups. The RAFT reagent has a light color, and the final polymer product is essentially free of RAFT reagent color.