Organic-inorganic copolymerized high-impact-resistance elastomer composite material and preparation method thereof

By employing an organic-inorganic copolymerization strategy, a polythioctic acid/zinc oxide hybrid network was constructed using dynamic disulfide bonds and the chemical coordination bonds of zinc oxide nanoparticles. This solved the problems of easy fracture and interfacial incompatibility of polymer materials under extreme impact, and achieved a composite material with high impact resistance and self-healing ability.

CN121991376APending Publication Date: 2026-05-08NANJING TECH UNIV
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Patent Information

Application Number
CN202610274589.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-06
Publication Date
2026-05-08

AI Technical Summary

Technical Problem

Existing polymer materials are prone to irreversible fracture under extreme impact, and the incompatibility of the organic-inorganic interface leads to the aggregation of nanoparticles, forming stress concentration points, weakening the reinforcement effect and becoming the source of crack initiation. Traditional interface control strategies are difficult to achieve uniform mixing and firm bonding.

Method used

An organic-inorganic copolymerization strategy is adopted, in which polythioctic acid is constructed as the organic matrix through dynamic disulfide bonds, and zinc oxide nanoparticles with unsaturated coordination sites on the surface serve as the inorganic reinforcing phase. Molecular-scale hybrid structural units are formed by chemical coordination bonds or covalent bonds to ensure interfacial stability and composite uniformity. A polythioctic acid/zinc oxide molecular hybrid network is constructed by controllable thermal polymerization.

Benefits of technology

It enables the material to maintain a stable shape under high-speed impact, possesses excellent rigidity-toughness balance and energy dissipation capability, and has self-healing properties, significantly improving the material's impact resistance and service life.

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Abstract

The invention discloses a high-impact-resistance elastomer composite material based on an organic-inorganic copolymerization strategy and a preparation method thereof. The composite material is prepared through an organic-inorganic copolymerization strategy and comprises metal oxide nanoparticles with the particle size of 1-10 nm and rich in unsaturated metal sites on the surface as an inorganic phase and a polymer network containing dynamic covalent bonds as an organic phase, the inorganic phase and the organic phase are connected through a chemical bond to form a molecular-scale organic-inorganic hybrid structure unit, so that uniform dispersion and strong interface combination of the inorganic phase are realized. The preparation method comprises the following steps: regulating and synthesizing zinc oxide nanoparticles with rich unsaturated sites on the surfaces through a regulator; carrying out pre-coordination assembly on the zinc oxide and a lipoic acid monomer to form a lipoic acid-zinc oxide hybrid monomer; and carrying out thermal polymerization to obtain the elastomer composite material. The elongation at break of the obtained material reaches 541% and is increased by nearly 12 times compared with that of pure polylipoic acid, the impact force can be attenuated by 90% or above in a drop hammer impact test, the impact strain rate reaching up to 4000 s <-1 > can be borne, and damage self-healing can be achieved at the room temperature without external force. The material has excellent impact resistance, high toughness, intrinsic self-healing ability and solvent-resistant stability, the preparation method is simple and controllable, and the material has wide application prospects in the fields of personal protection, aerospace, flexible electronics and the like.
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