2results about How to "Solve the brittle" patented technology

The invention discloses a dynamic self-repairing PI-based nano protective coating for a crease-free folding screen. The dynamic self-repairing PI-based nano protective coating is prepared from a polyimide matrix, a dynamic cross-linking agent, self-repairing microcapsules, a surface-modified nano inorganic filler and a surface energy regulator, the polyimide matrix is obtained by polymerizing aromatic dianhydride and a diamine monomer containing a flexible chain segment, and the flexible chain segment comprises an ether bond or a methylene chain segment; the shell material of the self-repairing microcapsule is polyurea or polyurethane, and the core material of the self-repairing microcapsule is a polyimide repairing agent; the surface modified nano inorganic filler is SiO2 or Al2O3 nano particles subjected to surface grafting modification by a silane coupling agent. The preparation method has the beneficial effects that the coating prepared by the preparation method simultaneously realizes the basic performances of high hardness, high toughness, high light transmittance and strong adhesion, has the efficient grading self-repairing capability aiming at damages of different scales, and finally passes more than one hundred thousand times of extreme bending fatigue tests; the problems of balance of multi-performance requirements, single repair mechanism and low efficiency in the prior art are solved.

This invention provides an amino-functionalized transparent impact-resistant isophthalic resin and its preparation method, belonging to the field of functional polymer material synthesis. The amino-functionalized transparent impact-resistant isophthalic resin is a multi-component copolymer of styrene, isoprene, and a p-chloromethylstyrene derivative monomer containing tertiary amine functional groups. The preparation method employs a classic anionic polymerization method. First, an amino-functionalized polystyrene active segment SN1 is prepared. Then, it is added to a styrene / isoprene mixed monomer for a two-stage reaction to obtain a block copolymer segment SN1-SP with alternating styrene / isoprene sequences. Finally, styrene and the amino-functionalized monomer are added for a three-stage reaction or directly coupled with a coupling agent to obtain a special block copolymer SN1-SP-SN2, successfully yielding the amino-functionalized transparent impact-resistant isophthalic resin. By controlling the length of the special alternating sequence molecular chain and the block composition ratio, the mechanical properties of the product are controlled. Simultaneously, the tertiary amine polar groups are quantitatively introduced into the molecular chains, successfully achieving high impact resistance and transparency, and also enhancing the resin polarity. Using a lithium-based polymerization method, the resin particles are free of monomer and harmful impurities.