Ethylene / alpha-olefin gradient copolymer and preparation method thereof
By coordinating polymerization with a catalytic system of bisphenoloxy metal complex with a specific structure and an organic salt compound and an organic aluminum compound, an ethylene/α-olefin gradient copolymer was successfully prepared, which solved the problem of difficulty in synthesizing gradient copolymers in the prior art, and achieved the preparation of materials with high breakdown voltage and gradient structures.
CN119708316AActive Publication Date: 2025-03-28CHANGCHUN INSTITUTE OF APPLIED CHEMISTRY CHINESE ACADEMY OF SCIENCES
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Patent Information
- Application Number
- CN202411838618.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2044-12-13
AI Technical Summary
Technical Problem
The prior art is difficult to prepare ethylene/α-olefin gradient copolymers by coordination polymerization, resulting in the synthesis of gradient copolymers being challenging.
Method used
A catalytic system consisting of a bisphenoloxy metal complex with a specific structure, an organic salt compound and an organic aluminum compound, was used to polymerize ethylene and α-olefin under the catalytic system, and coordinate polymerization was successfully achieved to prepare an ethylene/α-olefin gradient copolymer.
Benefits of technology
The obtained ethylene/α-olefin gradient copolymer has a strong breakdown voltage, and the component drift is sensitive to changes in the comonomer concentration, showing good gradient structural characteristics.
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Abstract
The invention relates to the technical field of copolymers, in particular to an ethylene / alpha-olefin gradient copolymer and a preparation method thereof. According to the preparation method provided by the invention, two monomers of ethylene and alpha-olefin with different polymerization activities are adopted, the copolymerization capability of the bisphenol oxygen group complex for catalyzing ethylene and alpha-olefin is researched by adjusting the structure of the complex, and the copolymerization activity of the bisphenol oxygen group complex is improved by changing the polymerization reaction process (alpha-olefin concentration and ethylene pressure). ) to regulate the insertion rate of alpha-olefin and the sequence structure of the polymer; a proper polymerization system is screened out, so that the sequence structure of the polymer can change along with the proceeding of the reaction, thereby forming a gradient structure in a chain to obtain the ethylene / alpha-olefin gradient copolymer, and the copolymer has high breakdown field strength and is a novel material which is not reported in the prior art.
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