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A polyolefin material with controllable degradation unit and high monomer utilization rate and its preparation method

A utilization rate and polyolefin technology, applied in the field of polyolefin materials, can solve problems such as wide molecular weight distribution, uncontrollable polymer molecular weight, and uneven distribution of functional groups

Active Publication Date: 2021-07-06
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the molecular weight of the polymer produced by traditional free radical initiators for this type of free radical (co)polymerization cannot be controlled, the molecular weight distribution is wide, and the problems such as the uneven distribution of the introduced functional groups on the polymer backbone are still difficult to solve.

Method used

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  • A polyolefin material with controllable degradation unit and high monomer utilization rate and its preparation method
  • A polyolefin material with controllable degradation unit and high monomer utilization rate and its preparation method
  • A polyolefin material with controllable degradation unit and high monomer utilization rate and its preparation method

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preparation example Construction

[0031] The invention provides a method for preparing a degradable polyolefin with a controllable number of degradation units and a high monomer utilization rate, comprising the following steps:

[0032] The cycloketene acetal, free radical initiator and chain transfer reagent are dissolved in a solvent and then reacted with olefin or olefin derivative to obtain a degradable polyolefin material.

[0033] In the invention, firstly, the cycloketene acetal, the free radical initiator and the chain transfer reagent are dissolved in a solvent to obtain a mixed solution.

[0034] Wherein, the cycloalkene acetal is selected from one or more of 2-methylene-1,3-dioxetane, 2-methylene-1,3,6-trioxetane kind.

[0035] The free radical initiator is selected from azobisisobutyronitrile, azobisisoheptanonitrile, benzoyl peroxide, lauroyl peroxide, cumene hydroperoxide, tert-butyl hydroperoxide, dihydroperoxide tert-butyl, dicumyl peroxide, tert-butyl peroxybenzoate, tert-butyl peroxy-valera...

Embodiment 1

[0062] 0.58g 2-methylene-1,3-dioxetane, 3.2g dimethyl carbonate, 0.007g azobisisobutyronitrile and 0.02g cyanomethyl-N-methyl-N-phenyl Mix dithiocarbamate evenly, place in a 100ml stainless steel reactor, feed ethylene until the pressure reaches 3MPa, heat the mixture to 70°C under stirring, continue feeding ethylene to keep the reactor pressure constant, and react for 22 hours .

[0063] The reactor was cooled to room temperature, the crude polymerization mixture was precipitated in methanol, then centrifuged to remove the methanol, the resulting polymer was dissolved in chloroform, again precipitated in excess methanol, the methanol was removed and dried under vacuum. The degradable polyolefin 1 can be obtained.

Embodiment 2

[0065] Experiment in a method similar to Example 1, except that cyanomethyl-N-methyl-N-phenyldithiocarbamate is changed into ethoxy xanthate to obtain degradable poly Alkenes 2.

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Abstract

The invention provides a method for preparing degradable polyolefin with controllable number of degradation units and high monomer utilization rate, comprising the following steps: dissolving cycloketene acetal, free radical initiator and chain transfer reagent in a solvent and then React with olefins or olefin derivatives to obtain degradable polyolefin materials. The invention uses RAFT polymerization of cyclic ketene acetal and olefin to copolymerize cyclic ketene acetal and polyolefin in a random manner, and introduces ester bonds on all polyolefin carbon skeletons. The quantity of the degradable units (ester bonds) introduced by the method of the present invention is controllable, the utilization rate of the monomer is high, the production cost can be effectively reduced and the degradation of the polyolefin can be controlled.

Description

technical field [0001] The invention belongs to the technical field of polyolefin materials, and in particular relates to a polyolefin material with controllable degradation unit and high monomer utilization rate and a preparation method thereof. Background technique [0002] The use of polyolefin plastics has promoted the revolutionary progress of commodity packaging, such as polyethylene / polypropylene plastic films, bags, bottles, polystyrene plastic cups, plastic packaging, etc., providing a stable, relatively unbreakable, chemically resistant lightweight packaging materials. Traditional plastic materials used for packaging include polyethylene, polypropylene, polystyrene, etc. In addition, plastics are widely used in other disposable care products, disposable work clothing, and other disposable products. The many advantages of plastics make it widely used in various fields. However, the increase in the amount of plastics has also caused serious environmental problems,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/02C08F224/00C08F2/38
CPCC08F2/38C08F210/02C08F2438/03C08F224/00
Inventor 尤业字张晓宇曾天佑
Owner UNIV OF SCI & TECH OF CHINA
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