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A kind of zinc catalyst and its preparation method and application in lactone ring-opening polymerization

A catalyst and polymerization technology, applied in the direction of zinc organic compounds, 2/12 group organic compounds without C-metal bonds, etc., can solve the problems of limited application, difficult to remove, and the danger of degradable polymer materials, and achieve The effect of convenient preparation, stable properties and high catalytic activity

Inactive Publication Date: 2019-06-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] After the ring-opening polymerization reaction of the metal complex catalyst system, a small amount of metal salts will remain in the aliphatic polyester product, which is difficult to remove during the purification of the polymer, which will make the degradable polymer material products potentially harmful. Risk, which limits its application in the field of biomedicine

Method used

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  • A kind of zinc catalyst and its preparation method and application in lactone ring-opening polymerization
  • A kind of zinc catalyst and its preparation method and application in lactone ring-opening polymerization
  • A kind of zinc catalyst and its preparation method and application in lactone ring-opening polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Synthesis of ligand L1 and zinc catalyst Zn1:

[0026] With reference to literature (Synthesis, 1998, 1998 (07): 1029-1032.), p-cresol (4.040g, 37.3mmol) was dissolved in 40ml trifluoroacetic acid, and hexamethylenetetramine (10.600g , 75.6mmol), stirred at 90°C for 24h, the solution changed from yellow to reddish brown. The reaction solution was poured into 60ml of 4M HCl solution while it was hot, and stirred at room temperature for 2h, and an orange-red oily substance precipitated out at the bottom of the flask. Continue to add 100ml of 4M HCl solution, white turbidity is formed during the addition process, and the stirring becomes clear again. The resulting solution was poured into a 500ml separatory funnel, extracted with CH2Cl2 (100ml×3), and the organic phases were combined. Then wash with 4M HCl solution, H2O, NaCl saturated solution (100ml×3) respectively. The resulting yellow liquid was dried over anhydrous Na2SO4 and concentrated to give the crude product ...

Embodiment 2

[0032] Synthesis of ligand L2 and zinc catalyst Zn2:

[0033] Except that p-tert-butylphenol and hexamethylenetetramine are used as raw materials, other operating steps are the same as in Example 1. The obtained Zn2 structural formula is:

[0034]

Embodiment 3

[0036] Synthesis of ligand L3 and zinc catalyst Zn3:

[0037] Except that p-chlorophenol and hexamethylenetetramine are used as raw materials, other operating steps are the same as in Example 1. The obtained Zn3 structural formula is:

[0038]

[0039] All the compounds prepared above and the zinc complexes containing NNO ligands were confirmed by NMR, IR and elemental analysis.

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Abstract

The invention discloses a preparation method of a zinc complex and application of the zinc complex as a catalyst in ring-opening polymerization reaction of a lactone monomer. The catalyst system adopts zinc metal as the center of a coordination catalyst, and the ligand is a tridentate ligand composed of NNO. Specifically, the zinc catalyst and a certain amount of alkyl lithium are firstly mixed with in a solvent for reaction to generate an alkyl zinc complex, and then a lactone monomer is added for polymerization reaction. The zinc complex provided by the invention shows excellent catalytic activity in the ring-opening polymerization reaction of epsilon-caprolactone, and as an inherent trace element in the human body, zinc metal is non-toxic and harmless to the human body, therefore the polyester material prepared from the system as a catalyst has wide application prospects in the medical field.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and relates to a zinc complex catalyst and the application of the catalyst in lactone ring-opening polymerization. Background technique [0002] In recent years, growing white pollution has become a serious environmental problem. Since the 1940s, polymer materials based on petrochemical industry have received great attention. Despite the many advantages of these materials, there are still two major disadvantages that need to be addressed. One is that various plastic products made of polyolefin polymer compounds are very stable in the natural environment, and they are difficult to degrade in nature, resulting in huge environmental pressure; in addition, the limited petroleum resources are consumed in large quantities, which will lead to resource depletion. Dries up fast. Therefore, seeking renewable, environment-friendly and biodegradable polymer materials has become a research hotspo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F3/06C08G63/82C08G63/08
CPCC07F3/003C08G63/08C08G63/823C08G63/826
Inventor 介素云胡倩李伯耿
Owner ZHEJIANG UNIV