Multi-block branched polyethylene and its preparation method

A branched polyethylene, multi-block technology, applied in the field of thermoplastic elastomers, can solve the problem of high production cost

Active Publication Date: 2020-01-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These all lead to higher production costs of OBC

Method used

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  • Multi-block branched polyethylene and its preparation method
  • Multi-block branched polyethylene and its preparation method
  • Multi-block branched polyethylene and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Ethylene polymerization is carried out under anhydrous and oxygen-free conditions. Add 100 milliliters of n-heptane into a 200 milliliter stainless steel reaction kettle with mechanical stirring, control the temperature of the polymerization kettle to be 25° C. through jacket circulating water, and start stirring. In the polymerization kettle, add 2.0mmol cocatalyst ethyl aluminum dichloride successively [control the molar ratio between the aluminum in the ethyl aluminum dichloride and the nickel in the binuclear acenaphthylene (α-diimine) nickel catalyst to be 200], 0.2 mmol diethylzinc [control the molar ratio between the zinc in the diethylzinc and the nickel in the dinuclear acenaphthene (α-diimine) nickel catalyst to be 20], 5 μmol dinuclear acenaphthene (α-diimine) nickel catalyst 2 (R is isopropyl, dissolved in 10 ml of toluene in advance), the concentration of the catalyst in the polymerization system is 45.5 μmol / L. Feed ethylene until the pressure of the reac...

Embodiment 2

[0055] The polymerization pressure of ethylene was reduced to 0.7 MPa, and other conditions were the same as in Example 1 to obtain 18.5 grams of polymer. The catalyst activity is 3700kgPE[mol(Ni)h] -1 , the weight average molecular weight of the polymerization product is 12.6×10 4 g / mol, the polydispersity coefficient is 3.0, the glass transition temperature is -68°C, the melting point is 120.6°C, and the crystallinity is 9.2%. The tensile properties of the polymerization product were tested according to GB / T 528-2009, the tensile strength was 14.0MPa, and the elongation at break was 900%. The polymer product is stretched to 2 times of its original length at room temperature and maintained for 1 minute, and then the external force is removed, and it can recover to 1.21 times of its original length within 1 minute.

[0056] through 1 H-NMR measurement shows that the degree of branching of the polymerization product is 82.3 branched chains / 1000 carbon atoms, 49mol% of the bran...

Embodiment 3

[0059] The polymerization pressure of ethylene was reduced to 0.4 MPa, and other conditions were the same as in Example 1 to obtain 16.3 grams of polymer. The catalyst activity is 3260kgPE[mol(Ni)h] -1 , the weight average molecular weight of the polymerization product is 11.9×10 4 g / mol, the polydispersity coefficient is 2.9, the glass transition temperature is -69°C, the melting point is 120.1°C, and the crystallinity is 8.7%. The tensile properties of the polymerization product were tested according to GB / T 528-2009, the tensile strength was 12.0MPa, and the elongation at break was 850%. The polymer product is stretched to 2 times of its original length at room temperature and maintained for 1 minute and then removed from the external force, it can recover to 1.20 times of its original length within 1 minute.

[0060] through 1 H-NMR measurement, the degree of branching of the polymerization product is 93.2 branched chains / 1000 carbon atoms, and 54.8mol% is methyl branch...

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Abstract

The present invention relates to the technology of thermoplastic elastomers, and aims to provide a multi-block branched polyethylene and a preparation method therefor, and further provide an application for the polyethylene. The multi-block branched polyethylene of the present invention is formed by alternate connection according to the connecting means of formula (A) by a semi-crystalline polyethylene segment having a low branching degree as a hard segment and an amorphous polyethylene segment having a high branching degree as a soft segment. In the preparation process of the present invention, the raw material is an ethylene monomer only, and thus production costs are low. The preparation process only requires one catalyst, thus considering the issue of matching two catalysts is not necessary, thereby greatly simplifying the production process and being suitable for large-scale industrial production. The chain shuttling reaction of the present invention is carried out between two identical metal active centers in a molecule, and has the advantages of being highly efficiency and fast. The chain structure and composition of the polymerization product are uniform. The polymerization reaction conditions are mild, the same not needing to be carried out at high temperatures, such that the energy consumption thereof is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of thermoplastic elastomers, in particular to multi-block branched polyethylene and a preparation method thereof. Background technique [0002] This invention relates to the polymerization of ethylene as a monomer to form polymers with unique topologies, to methods of making such polymers, and to the resulting polymer products. In another aspect, the invention relates to methods of using these polymers in applications requiring unique combinations of physical properties. In yet another aspect, the invention relates to articles made from these polymers. The polymer of the present invention is a novel polymer with a unique chain structure, which makes the polymer have unique physical properties. Such polymers and blends comprising such polymers are useful in the preparation of solid articles such as moldings, films, sheets, and foamed articles by molding, extrusion, or other methods, and as adhesives , lami...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F110/02C08F2/38C08F4/70
CPCC08F110/02C08F2/38C08F4/7006
Inventor 傅智盛范志强方实耿成振美朱良傅信翀
Owner ZHEJIANG UNIV
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