Lewis acid-base pair catalyst, preparation method and method for catalytically synthesizing polyester

A Lewis acid-base pair and catalyst technology, which is applied in the field of Lewis acid-base pair catalyst, catalyzed synthesis of polyester, and preparation, can solve the problems of low polymer molecular weight, lack of catalyst types, low monomer conversion rate, etc., and achieve improved reaction Poor control, low price, high activity effect

Active Publication Date: 2022-02-08
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to address the relatively scarce types of existing catalysts, the bulk copolymerization of phthalic anhydride and cyclohexene oxide to generate polyesters with low molecu

Method used

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  • Lewis acid-base pair catalyst, preparation method and method for catalytically synthesizing polyester
  • Lewis acid-base pair catalyst, preparation method and method for catalytically synthesizing polyester
  • Lewis acid-base pair catalyst, preparation method and method for catalytically synthesizing polyester

Examples

Experimental program
Comparison scheme
Effect test

preparation example 11～15

[0057] Preparation example 1.1~1.5 prepares quaternary phosphorus salt

[0058] Select triphenylphosphine and halogenated olefins to prepare quaternary phosphorus salts. The specific operations of Preparation Examples 1.1-1.5 are as follows.

preparation example 11

[0060] Triphenylphosphine (0.262 g, 1 mmol, 1 equiv) and 3-bromopropane (0.13 mL, 1.5 mmol, 1.5 equiv) were dissolved in toluene (5 mL) and heated at 70 °C for 48 h. The reaction mixture was concentrated in vacuo to obtain the crude product, which was further purified by washing with ether three times. The white solid was collected by vacuum filtration and dried under vacuum at 40 °C for 12 hours.

preparation example 12

[0062] Triphenylphosphine (0.262 g, 1 mmol, 1 equiv) and 4-bromo-1-butene (0.15 mL, 1.5 mmol, 1.5 equiv) were dissolved in toluene (5 mL) and heated at 70°C for 48 hours. The reaction mixture was added three times the solvent volume of diethyl ether, and placed in the refrigerator to freeze. The white solid was filtered by vacuum while cooling and washed three times with diethyl ether. The white solid was dried under vacuum at 40 °C for 12 h.

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Abstract

The invention relates to the field of catalyst synthesis. Aiming at the problems of lack of existing catalyst types as well as low polymer molecular weight, low initiation efficiency, existence of side reaction and low monomer conversion rate in polyester generation through phthalic anhydride and cyclohexene oxide bulk copolymerization, the invention provides a Lewis acid-base pair which has a structure shown in the specification, wherein n is equal to 1, 2, 3 or 4, and X is equal to Cl, Br or I. The preparation method of the Lewis acid-base pair catalyst comprises the following steps of: preparing quaternary phosphonium salt from triphenylphosphine and halogenated olefin; and preparing the catalyst from the quaternary phosphonium salt and 9-boron bicyclo [3.3.1] nonane. The invention also provides a method for synthesizing polyester, which comprises the step of: by taking anhydride and epoxy monomer as raw materials, carrying out ring-opening polymerization under the catalysis of the Lewis acid-base pair catalyst to generate an alternating copolymer. The catalytic system has the advantages of simplicity in preparation, high activity, convenience in use, low cost and wide applicability, and is very suitable for industrial production.

Description

technical field [0001] The invention relates to the field of catalyst synthesis, in particular to a Lewis acid-base pair catalyst, a preparation method and a method for catalytically synthesizing polyester. Background technique [0002] As an important polymer material, polyester can be used in the fields of fibers, packaging materials, photosensitive materials, insulating materials and biomedical materials. As the problem of white pollution becomes increasingly prominent, degradable plastics have become one of the effective solutions to the problem. [0003] The biggest advantage of the ring-opening polymerization of epoxides and cyclic anhydrides is that the source of raw materials is wide and diverse, and the polymerization can be controlled. Commonly used epoxy monomers include ethylene oxide (EO), PO, butylene oxide (BO), CHO, etc. Commonly used anhydride monomers include phthalic anhydride (PA), succinic anhydride (SA) , norbornene anhydride (NA), maleic anhydride (M...

Claims

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Application Information

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IPC IPC(8): C08G63/84C08G63/42
CPCC08G63/84C08G63/42Y02P20/584
Inventor 王晓武李志波孙阿斌李笋杜娟
Owner QINGDAO UNIV OF SCI & TECH
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