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Ionic liquid catalyst for synthesizing bio-based polycarbonate and method for synthesizing bio-based polycarbonate

A technology based on polycarbonate and ionic liquid, applied in the field of catalysis, can solve the problems of difficulty in synthesizing high molecular weight bio-based polycarbonate, difficult activation of internal hydroxyl groups, low activity of internal hydroxyl groups, etc., so as to shorten the reaction time and improve the reaction activity. , the effect of high catalytic activity

Active Publication Date: 2020-04-17
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a wide variety of catalysts have been reported, the internal hydroxyl group of isosorbide is difficult to activate due to the easy formation of intramolecular hydrogen bonds, so the activity of the internal hydroxyl group of isosorbide is significantly lower than that of the external hydroxyl group, making it difficult to synthesize High molecular weight bio-based polycarbonate

Method used

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  • Ionic liquid catalyst for synthesizing bio-based polycarbonate and method for synthesizing bio-based polycarbonate
  • Ionic liquid catalyst for synthesizing bio-based polycarbonate and method for synthesizing bio-based polycarbonate
  • Ionic liquid catalyst for synthesizing bio-based polycarbonate and method for synthesizing bio-based polycarbonate

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Experimental program
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Embodiment 1

[0036] Take dihydroxyl compound and carbonic acid diester as the equation of raw material synthesis polycarbonate reaction:

[0037]

Embodiment 2

[0041] The difference with Example 1 is that the catalyst used is 5×10 -5 mol (relative to the amount of isosorbide substance) of tetrabutylphosphinelysine ([P 4444 ][Lys]), the yield of the resulting bio-based polycarbonate was 97%, the number average molecular weight was 85000g / mol, and the molecular weight distribution was 1.54.

Embodiment 3

[0043] The difference with Example 1 is that the catalyst used is 5×10 -5 mol (relative to the amount of isosorbide substance) of tetraethylammonium lysine ([N 2222 ][Lys]), the yield of the obtained bio-based polycarbonate was 96%, the number average molecular weight was 58000g / mol, and the molecular weight distribution was 1.62.

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Abstract

The invention relates to an ionic liquid catalyst for synthesizing bio-based polycarbonate and a method for synthesizing the bio-based polycarbonate. According to the invention, the anion of the ionicliquid catalyst is an amino acid anion, and the cation of the ionic liquid catalyst is any one selected from the group consisting of a quaternary ammonium cation, a quaternary phosphine cation, an imidazole cation, a pyridine cation and a piperidine cation. The amino acid ionic liquid catalyst disclosed by the invention has the advantages of environmental friendliness, biodegradability and low residue; furthermore, the catalyst disclosed by the invention is excellent in catalytic performance; compared with traditional catalysts such as an alkali metal salt, an alkaline earth metal salt, a quaternary ammonium salt, a quaternary phosphonium salt or the like, inter-molecular hydrogen bonds formed by ionic liquid and isosorbide can break intramolecular hydrogen bonds formed by internal hydroxyl groups of the isosorbide, and a ratio of the internal hydroxyl groups to the external hydroxyl groups of the activated isosorbide is smaller than 1, so the bio-based polycarbonate with good thermalstability (wherein Tg = 174 DEG C) and high molecular weight is synthesized.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to an ionic liquid catalyst for synthesizing bio-based polycarbonate and a method for synthesizing bio-based polycarbonate. Background technique [0002] Polycarbonate (PC) is a thermoplastic engineering plastic with excellent performance. It has the advantages of good light transmission, high strength, and good weather resistance. It is widely used in electronic appliances, building materials, automobile manufacturing, aerospace and other fields. At present, only bisphenol A polycarbonate has been produced on a large scale. The production of bisphenol A polycarbonate by the phosgene method is not only highly toxic, but also bisphenol A has potential health hazards. In recent years, with the continuous consumption of petroleum resources, bio-based polymer materials have become a research hotspot, among which isosorbide is considered to be the most promising alternative...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/30
CPCC08G64/305C08G64/307
Inventor 徐菲张振才李增喜何宏艳方文娟成卫国张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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