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Star-structured polyethylene and preparation method thereof

A polyethylene and star-shaped structure technology, applied in the field of star-shaped polyethylene and its preparation, can solve the problems of poor practicability, limited, complex synthesis routes, etc.

Active Publication Date: 2014-05-14
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are very limited reports on star-structured polyolefins in the literature, and most of the synthetic methods have complex synthetic routes, requiring special olefin polymerization catalysts or / and multi-step reaction routes, which are not very practical

Method used

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  • Star-structured polyethylene and preparation method thereof
  • Star-structured polyethylene and preparation method thereof
  • Star-structured polyethylene and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] In a 250ml two-necked bottle, add 5g terminal double bond polyethylene (number average molecular weight Mn=2000g / mol, polydispersity index PDI=2.4), vacuum dry at 40°C for 1 hour, fill with nitrogen, add 100ml toluene, and heat up to 110°C , stir to fully dissolve. 0.3 g of dioctanoyl peroxide and 6 g of (3-mercaptopropyl)trimethoxysilane were added under a nitrogen atmosphere. Continue to stir and react for 12 hours, precipitate the polymer with a large amount of methanol, filter, wash with methanol repeatedly at 50°C and dry in vacuum for 12 hours to obtain trimethoxysilane-terminated polyethylene.

[0094] 1 H NMR and 13 C NMR characterization confirmed that the polyethylene terminal unsaturated double bond reaction was complete, and the selectivity of trimethoxysilane-capped polyethylene terminal group was higher than 90%.

Embodiment 2

[0096] In a 250ml two-necked bottle, add 5g terminal double bond polyethylene (number average molecular weight Mn=600g / mol, polydispersity index PDI=1.3), vacuum dry at 40°C for 1 hour, fill with nitrogen, add 100ml ethylbenzene, heat up to 80 ℃, stir to fully dissolve. 1.0 g of azobisisobutyronitrile and 10 g of (5-mercaptopentyl)triethoxysilane were added under a nitrogen atmosphere. Continue to stir and react for 7 hours, precipitate the polymer with a large amount of methanol, filter, wash with methanol repeatedly at 50°C and dry in vacuum for 12 hours to obtain triethoxysilane-capped polyethylene.

[0097] 1 H NMR and 13 C NMR characterization confirmed that the polyethylene terminal unsaturated double bond reaction was complete, and the selectivity of triethoxysilane-capped polyethylene terminal group was higher than 90%.

Embodiment 3

[0099] In a 100ml two-necked bottle, add 4g of epoxy group-terminated polyethylene (number-average molecular weight Mn=1500g / mol, polydispersity index PDI=3.5), vacuum dry at 40°C for 1 hour, fill with nitrogen, add 50ml of chlorobenzene and 10g (3-aminopropyl)triethoxysilane, heated up to 100°C, stirred to fully dissolve. After reacting for 10 hours, the polymer was precipitated with a large amount of methanol, filtered, washed with methanol repeatedly at 50° C. and dried in vacuum for 12 hours to obtain triethoxysilane-capped polyethylene.

[0100] 1 H NMR and 13 C NMR characterization confirmed that the polyethylene terminal hydroxyl groups were completely converted, and the selectivity of triethoxysilane-capped polyethylene terminal groups was higher than 90%.

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Abstract

The invention relates to star-structured polyethylene taking silicon dioxide as a kernel, and a preparation method of the star-structured polyethylene. The star-structured polyethylene is as shown in the formula (I) in the specification, and the chemical structure is as follows: SinBn(OH)mO3[n-m], wherein PE is a polyethylene chain, n is 3-20, m is 0-30, kernel A is a compound which has a structure similar to that of silicon dioxide and is prepared by condensating silanol in different degrees, a silicon atom contains 0-2 hydroxy groups, arm B is a polyethylene chain with the structure of PE-R-R2, PE is a polyethylene chain, R is -CH2Ch2S-, -CH(OH)CH2NH or -OCONH-, R2 is vinyl of C1-C6. The invention further provides the preparation method of the compound. The star-structured polyethylene provided by the invention is wide in raw material resource, is simple, convenient and efficient in preparation method, low in cost, definite in structure of a product, excellent in property and high in practicability.

Description

technical field [0001] The present invention relates to star structure polyethylene and its preparation method. Background technique [0002] Polyolefin has excellent performance and low price. It is widely used in daily life, industry, agriculture and other fields. It is the largest synthetic resin variety in the world. Linear polyolefins, especially high molecular weight linear polyethylene, have high viscosity and poor processability in molten or solution state. The branched or hyperbranched molecular structure has an important influence on the physical properties of polyolefins, which is beneficial to improve its processing performance and broaden its application range (Chemical Advances, 2009, 21(12):2651-2659). Low molecular weight hyperbranched polyethylene can act as a polymer processing aid, and effectively improve the processing performance of polyolefin matrix under the premise of relatively low addition amount. [0003] Star polymers have the simplest branched ...

Claims

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Application Information

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IPC IPC(8): C08G81/02C08F10/02C08F8/42
Inventor 李化毅张勇杰李倩胡友良
Owner INST OF CHEM CHINESE ACAD OF SCI
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