Multi-block branched polyethylene and preparation method thereof

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

Active Publication Date: 2017-04-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Examples

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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 kept 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 branched c...

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 invention relates to the thermoplastic elastomer technology, aims to provide multi-block branched polyethylene and a preparation method thereof and further provides an application of polyethylene. The multi-block branched polyethylene is formed by alternately connecting semi-crystalline low-branching-degree polyethylene chain segment used as a hard segment and an amorphous high-branching-degree polyethylene chain segment used as a soft segment in a soft segment-hard segment-soft segment-hard segment connection manner. During preparation, only vinyl monomer is used as a raw material, and the production cost is low; only one catalyst is needed, the matching problem of two catalysts is not required to be considered, the production process is greatly simplified, and the method is suitable for mass industrial production. A chain shuttle reaction is performed between two identical metal activity centers in molecules, the advantages of high efficiency and quickness are realized, the chain structure and composition of a polymerized product are uniform, the polymerization reaction adopts mild condition and is not required to be performed at the high temperature, and energy consumption is substantially 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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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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