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Method for preparing polymer by atom transfer radical polymerization catalyzed by cyclic iron salts at room temperature

A technology of polymer and polymer solution, applied in chemical recovery and other directions, can solve the problems of unusable, high temperature, and inability to recover pure catalyst, and achieve the effect of low metal residue, good catalytic efficiency and high separation efficiency

Active Publication Date: 2018-12-07
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to its unique mild polymerization conditions and high reaction efficiency, photochemistry has developed rapidly in recent years, but the existing catalyst recovery system is subject to various limitations, such as high temperature and cannot be used in photochemical polymerization systems; the special defect is that it cannot When recovering pure catalysts, most methods recover complexes formed between catalysts and ligands, which cannot truly recover catalysts

Method used

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  • Method for preparing polymer by atom transfer radical polymerization catalyzed by cyclic iron salts at room temperature
  • Method for preparing polymer by atom transfer radical polymerization catalyzed by cyclic iron salts at room temperature
  • Method for preparing polymer by atom transfer radical polymerization catalyzed by cyclic iron salts at room temperature

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: Catalyst recovery method in the atom transfer radical polymerization catalyzed by iron salt at room temperature

[0039] Water-soluble monomer mPEGMA 500 (1.0 mL, 2.1 mmol), initiator EBPA (4.6 μL, 2.6×10 -2 mmol), catalyst iron tetraphenylporphyrin Fe(III)-TPP (7.5 mg, 1.1×10 -2 mmol), ligand n-butylammonium bromide TBA-Br (20.5 mg, 6.3×10 -2 mmol), UV photoinitiator TPO were added to 5 mL ampoule, then p-xylene (1.0 mL) and absolute ethanol (1.0 mL) were added to it, the tube was melted and sealed, and the temperature of the ampoule was transferred to room temperature The polymerization was carried out under the condition of magnetic stirring under the ultraviolet lamp. Break the tube after the scheduled polymerization time (4 h), and add pure water (1.0 mL) to induce the separation of the catalyst-dissolved p-xylene phase and the polymer-dissolved ethanol phase, and remove the upper p-xylene layer For recycling, the remaining ethanol layer is dia...

Embodiment 2

[0054] Embodiment 2: the recycling experiment of catalyst

[0055] The present invention is characterized in that it can keep the metal residues in the polymer extremely low after polymerization, and can recycle the catalyst. After the polymerization, the upper p-xylene phase (dissolved with the catalyst) is taken out and placed in another equal-volume In a clean ampoule, just add a predetermined amount of monomer, initiator, ligand, UV photoinitiator and predetermined volume of ethanol (the amount of the remaining components added in this recovery experiment is equal to that before recovery), and then the next round of aggregation. The single-point experiments under different recovery times are shown in Table 2.

[0056] Table 2 Comparison of single-point polymerization experiments under different recycling times

[0057] usage count

Conversion rates(%)

Theoretical molecular weight (g / mol)

GPC molecular weight (g / mol)

PDI

Metal residue in polyme...

Embodiment 3

[0060] Embodiment 3: Catalyst recovery method in the atom transfer radical polymerization catalyzed by iron salt at room temperature

[0061] According to the ratio of Example two, the water-soluble monomer N,N-dimethylaminoethyl methacrylate, initiator EBPA, catalyst tetraphenylporphyrin iron Fe(III)-TPP, ligand n-butyl bromide Ammonium chloride TBA-Br and UV photoinitiator TPO were added to the 5mL ampoule, then p-xylene (1.0 mL) and absolute ethanol (1.0 mL) were added to it, the tube was melted and sealed, and the ampoule was transferred to temperature Polymerization was carried out under a UV lamp (50 W) at room temperature with magnetic stirring. Break the tube after the scheduled polymerization time (4 h), and add pure water (1.0 mL) to induce the separation of the catalyst-dissolved p-xylene phase and the polymer-dissolved ethanol phase, and pipette the upper p-xylene layer For recycling, the remaining ethanol layer is dialyzed to obtain the desired polymer, which is ...

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Abstract

The invention discloses a method for preparing a polymer by atom transfer radical polymerization catalyzed by cyclic iron salts at a room temperature. Specially, the method includes the following steps: 1) performing the ATRP polymerization in a p-xylene / ethanol mixed solvent; 2) after ending of the polymerization, adding a certain amount of water to induce stratification of a solution, and obtaining the solution containing a catalyst and the polymer; and 3) adding a new monomer, initiator ligand and ultraviolet photoinitiator to a recovered catalyst solution for performing a next round of polymerization. In a reaction of the ATRP, an iron salt is used as a catalyst at the room temperature; polymerization is carried out under ultraviolet light irradiation to obtain the polymer having goodcontrollability; and the catalyst can be recovered and reused, and the residual amount of the catalyst in the polymer is maintained to be extremely low.

Description

[0001] The present invention belongs to the divisional application of the patent application titled Catalyst Recovery Method in Atom Transfer Radical Polymerization Catalyzed by Iron Salt at Room Temperature, with the filing date of January 19, 2017 and the application number of 201710038548.9. technical field [0002] The invention belongs to the technical field of active polymerization catalyzed by iron salts, in particular to a catalyst recovery method in atom transfer radical polymerization catalyzed by iron salts at room temperature. Background technique [0003] Atom transfer radical polymerization (ATRP) is a widely used living polymerization method, and the catalyst plays a key role in ATRP, but a large amount of metal residues seriously affects the application of polymer materials in electronic materials and biological materials. So far, there are mainly three methods to solve the catalyst residue problem. One is to develop metal-free catalyzed ATRP, but the inorgan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F6/12C08F6/06C08F2/48C08F4/80C08F120/28C08F120/54C08F120/34
CPCC08F2/48C08F4/80C08F6/06C08F6/12C08F120/28C08F120/34C08F120/54C08L33/14C08L33/24Y02P20/584
Inventor 程振平吴健章冰洁张丽芬朱秀林
Owner SUZHOU UNIV
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